30 results on '"Hódar, José Antonio"'
Search Results
2. Close and distant: Contrasting the metabolism of two closely related subspecies of Scots pine under the effects of folivory and summer drought
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Rivas‐Ubach, Albert, Sardans, Jordi, Hódar, José Antonio, Garcia‐Porta, Joan, Guenther, Alex, Paša‐Tolić, Ljiljana, Oravec, Michal, Urban, Otmar, and Peñuelas, Josep
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Biological Sciences ,Ecology ,drought ,evolutionary processes ,folivory ,herbivorous attack ,metabolomics ,Pinus sylvestris ,processionary moth ,sympatric subspecies ,Evolutionary Biology ,Evolutionary biology ,Ecological applications - Abstract
Metabolomes, as chemical phenotypes of organisms, are likely not only shaped by the environment but also by common ancestry. If this is the case, we expect that closely related species of pines will tend to reach similar metabolomic solutions to the same environmental stressors. We examined the metabolomes of two sympatric subspecies of Pinus sylvestris in Sierra Nevada (southern Iberian Peninsula), in summer and winter and exposed to folivory by the pine processionary moth. The overall metabolomes differed between the subspecies but both tended to respond more similarly to folivory. The metabolomes of the subspecies were more dissimilar in summer than in winter, and iberica trees had higher concentrations of metabolites directly related to drought stress. Our results are consistent with the notion that certain plant metabolic responses associated with folivory have been phylogenetically conserved. The larger divergence between subspecies metabolomes in summer is likely due to the warmer and drier conditions that the northern iberica subspecies experience in Sierra Nevada. Our results provide crucial insights into how iberica populations would respond to the predicted conditions of climate change under an increased defoliation in the Mediterranean Basin.
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- 2017
3. Shrub of a Thousand Faces: An Individual Segmentation from Satellite Images Using Deep Learng
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Khaldi, Rohaifa, primary, Tabik, Siham, additional, Puertas-Ruiz, Sergio, additional, de Giles, Julio Peñas, additional, Hódar, José Antonio, additional, Zamora, Regino, additional, and Alcaraz Segura, Domngo, additional
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- 2024
- Full Text
- View/download PDF
4. Positive adjacency effects mediated by seed disperser birds in pine plantations
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Zamora, Regino, Hódar, José Antonio, Matías, Luís, and Mendoza, Irene
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- 2010
5. Implications of mistletoe parasitism for the host metabolome: A new plant identity in the forest canopy
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Lázaro‐González, Alba, primary, Gargallo‐Garriga, Albert, additional, Hódar, José Antonio, additional, Sardans, Jordi, additional, Oravec, Michal, additional, Urban, Otmar, additional, Peñuelas, Josep, additional, and Zamora, Regino, additional
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- 2021
- Full Text
- View/download PDF
6. New records of insects in the albuferas de Adra (Almería, Spain), and other data of interest for the south of the Iberian Peninsula (Arthropoda, Insecta)
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Gómez de Dios, Miguel Ángel, Barranco, Pablo, Hódar, José Antonio, Yeste Yeste, Antonio, Santa, Mauricio, Paracuellos, Mariano, Rodríguez Luque, Francisco, Rodríguez Lozano, Borja, Tarifa, Rubén, Universidad Pública de Navarra. Departamento de Ciencias, and Nafarroako Unibertsitate Publikoa. Zientziak Saila
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Entomofauna terrestre ,Albuferas de Adra ,Identificación de especies ,Muestreo - Abstract
Las albuferas de Adra son uno de los humedales mejor conocidos a escala nacional en diversas disciplinas, no obstante, existe un gran vacío de información en lo que se refiere a la entomofauna Terrestre. Tratando de paliar esta situación, en febrero de 2017 se inició un muestreo de la artropodofauna en la vegetación circundante a las principales lagunas del complejo palustre, las albuferas Nueva y Honda. De las 114 especies identificadas hasta el momento (marzo de 2020), cabe destacar cuatro por constituir nuevas citas para la provincia de Almería. Se añade además el registro de una especie de interés, capturada en trampas de caída.
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- 2020
7. Nuevas citas de insectos en las albuferas de Adra (Almería, España), y otros datos de interés para el sur de la Península Ibérica (arthropoda, insecta)
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Gómez de Dios, Miguel Ángel, Barranco, Pablo, Hódar, José Antonio, Yeste Yeste, Antonio, Santa, Mauricio, Paracuellos, Mariano, Rodríguez Luque, Francisco, Rodríguez Lozano, Borja, Tarifa, Rubén, Universidad Pública de Navarra. Departamento de Ciencias, and Nafarroako Unibertsitate Publikoa. Zientziak Saila
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Entomofauna terrestre ,Albuferas de Adra ,Identificación de especies ,Muestreo - Abstract
Las albuferas de Adra son uno de los humedales mejor conocidos a escala nacional en diversas disciplinas, no obstante, existe un gran vacío de información en lo que se refiere a la entomofauna Terrestre. Tratando de paliar esta situación, en febrero de 2017 se inició un muestreo de la artropodofauna en la vegetación circundante a las principales lagunas del complejo palustre, las albuferas Nueva y Honda. De las 114 especies identificadas hasta el momento (marzo de 2020), cabe destacar cuatro por constituir nuevas citas para la provincia de Almería. Se añade además el registro de una especie de interés, capturada en trampas de caída.
- Published
- 2020
8. Drivers of degradation and other threats
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Doblas Miranda, Enrique, Attorre, Fabio, Azevedo, João, Belen, Ismail, Enríquez Alcalde, Elsa, Freitas, Helena, Garavaglia, Valentina, Hódar, José Antonio, Iritas, Özlem, Karaaslan, Yakup, Khater, Carla, Koutsias, Nikos, Lahlou, Mehdi, Malkinson, Dan, Mansour, Sophie, Pettenella, Davide, Nicolas Picard, Pino, Joan, Vieira, Joana, and Vitale, Marcello
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land degradation and fragmentation ,climate change ,biological invasion ,demographic pattern and migration ,micro- macro economy ,urbanization ,wildfires ,Biodiversity ,Forests ,Mediterranean ,Fire ,Vunerability ,Global change - Abstract
Forests in the Mediterranean region have been subject to environmental changes since time immemorial. The region’s geography and location has made it a conducive environment between biomes, resulting in significant biodiversity. Since the beginning of human history, forests have adapted to pressures caused by human development, resulting in a complex socio-ecological balance. These pressures, however,have never been more extreme than they are today. Global change, understood as the wide range of global forces resulting from human activity, is affecting the entire Mediterranean basin (Doblas-Miranda et al., 2017). The threats caused by global change pose particular risks to the principal characteristics of Mediterranean forests and forested habitats described in previous chapters: 1. Mediterranean forests and shrublands are highly sensitive to global atmospheric changes due to their proximity to arid regions; 2. a long history of land-use change may result in more frequent and intense fires, water scarcity and land degradation and; 3. a singular biota is linked to a higher vulnerability to global change-induced extinction. Moreover, the wide range of socioeconomic conditions and government policies that characterize the Mediterranean basin affect the intensity and dynamics of these threats.This chapter outlines the different threats to Mediterranean forest landscapes, structured according to indirect and direct causes of degradation. The anthropogenic origin of current global changes directly affecting Mediterranean forests is considered the underlying cause of degradation. Although in many cases these human forces have a global impact (such as greenhouse gas emissions caused by climate change), this chapter will consider their effect on the Mediterranean region in particular. This chapter will also consider the consequences of direct and indirect threats and the combination of both. info:eu-repo/semantics/publishedVersion
- Published
- 2018
9. Close and distant: Contrasting the metabolism of two closely related subspecies of Scots pine under the effects of folivory and summer drought.
- Author
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Rivas-Ubach, Albert, Rivas-Ubach, Albert, Sardans, Jordi, Hódar, José Antonio, Garcia-Porta, Joan, Guenther, Alex, Paša-Tolić, Ljiljana, Oravec, Michal, Urban, Otmar, Peñuelas, Josep, Rivas-Ubach, Albert, Rivas-Ubach, Albert, Sardans, Jordi, Hódar, José Antonio, Garcia-Porta, Joan, Guenther, Alex, Paša-Tolić, Ljiljana, Oravec, Michal, Urban, Otmar, and Peñuelas, Josep
- Abstract
Metabolomes, as chemical phenotypes of organisms, are likely not only shaped by the environment but also by common ancestry. If this is the case, we expect that closely related species of pines will tend to reach similar metabolomic solutions to the same environmental stressors. We examined the metabolomes of two sympatric subspecies of Pinus sylvestris in Sierra Nevada (southern Iberian Peninsula), in summer and winter and exposed to folivory by the pine processionary moth. The overall metabolomes differed between the subspecies but both tended to respond more similarly to folivory. The metabolomes of the subspecies were more dissimilar in summer than in winter, and iberica trees had higher concentrations of metabolites directly related to drought stress. Our results are consistent with the notion that certain plant metabolic responses associated with folivory have been phylogenetically conserved. The larger divergence between subspecies metabolomes in summer is likely due to the warmer and drier conditions that the northern iberica subspecies experience in Sierra Nevada. Our results provide crucial insights into how iberica populations would respond to the predicted conditions of climate change under an increased defoliation in the Mediterranean Basin.
- Published
- 2017
10. A review of the combination among global change factors in forests, shrublands and pastures of the Mediterranean Region: Beyond drought effects
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Ministerio de Economía y Competitividad (España), Doblas-Miranda, E., Alonso, R., Arnan, X., Bermejo, V., Brotons, Lluís, de las Heras, J., Estiarte, Marc, Hódar, José Antonio, Llorens, Pilar, Lloret, Francisco, López-Serrano, Francisco R., Martínez-Vilalta, Jordi, Moya, D., Peñuelas, Josep, Pino, Joan, Rodrigo, A., Roura-Pascual, N., Valladares Ros, Fernando, Vilà, Montserrat, Zamora, R., Retana, J., Ministerio de Economía y Competitividad (España), Doblas-Miranda, E., Alonso, R., Arnan, X., Bermejo, V., Brotons, Lluís, de las Heras, J., Estiarte, Marc, Hódar, José Antonio, Llorens, Pilar, Lloret, Francisco, López-Serrano, Francisco R., Martínez-Vilalta, Jordi, Moya, D., Peñuelas, Josep, Pino, Joan, Rodrigo, A., Roura-Pascual, N., Valladares Ros, Fernando, Vilà, Montserrat, Zamora, R., and Retana, J.
- Abstract
Climate change, alteration of atmospheric composition, land abandonment in some areas and land use intensification in others, wildfires and biological invasions threaten forests, shrublands and pastures all over the world. However, the impacts of the combinations between global change factors are not well understood despite its pressing importance. Here we posit that reviewing global change factors combination in an exemplary region can highlight the necessary aspects in order to better understand the challenges we face, warning about the consequences, and showing the challenges ahead of us. The forests, shrublands and pastures of the Mediterranean Basin are an ideal scenario for the study of these combinations due to its spatial and temporal heterogeneity, increasing and diverse human population and the historical legacy of land use transformations. The combination of multiple global change factors in the Basin shows different ecological effects. Some interactions alter the effects of a single factor, as drought enhances or decreases the effects of atmospheric components on plant ecophysiology. Several interactions generate new impacts: drought and land use changes, among others, alter water resources and lead to land degradation, vegetation regeneration decline, and expansion of forest diseases. Finally, different factors can occur alone or simultaneously leading to further increases in the risk of fires and biological invasions. The transitional nature of the Basin between temperate and arid climates involves a risk of irreversible ecosystem change towards more arid states. However, combinations between factors lead to unpredictable ecosystem alteration that goes beyond the particular consequences of drought. Complex global change scenarios should be studied in the Mediterranean and other regions of the world, including interregional studies. Here we show the inherent uncertainty of this complexity, which should be included in any management strategy.
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- 2017
11. From the individual to the landscape and back: time‐varying effects of climate and herbivory on tree sapling growth at distribution limits
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Ministerio de Ciencia e Innovación (España), Eusko Jaurlaritza, Herrero, Asier, Almaraz, Pablo, Zamora, Regino, Castro, Jorge, Hódar, José Antonio, Ministerio de Ciencia e Innovación (España), Eusko Jaurlaritza, Herrero, Asier, Almaraz, Pablo, Zamora, Regino, Castro, Jorge, and Hódar, José Antonio
- Abstract
As herbivory can modulate climate‐induced shifts in species distribution, disentangling the relative importance of herbivory and climate on plant growth can help to predict and manage future changes in vegetation, such as those occurring at treeline areas. An individual‐based hierarchical Bayesian time‐series model (individual‐based model; IBM) was developed to estimate the time‐varying impact of climate and herbivory on individual pine sapling height growth in woodland and treeline ecosystems of southern Europe during a 16‐year period. The performance of the IBM was compared to a linear mixed‐effects (LME) model to test for potential inferential effects when individual variability is marginalized. Time‐varying models were also compared to constant parameter approaches. Model fitting and posterior predictive checking suggests a better statistical performance of individual‐scale, time‐varying inference. LME modelling overestimated herbivory effects and underestimated environmental stochastic effects, and model validation indeed suggested severe overfitting in the LME model relative to the IBM strategy. These results reveal a potential failure of common aggregation strategies to correctly resolve the effects of climate and herbivory variability at the individual scale. Moreover, ignoring the time‐varying nature of the effects may preclude the correct estimation of the temporal scale of climate and herbivory impacts. In general, we found stronger individual‐ and time‐averaged effects of summer precipitation relative to the effects of herbivory, particularly at the treelines. Also, individual pine responses showed effects of the same sign more consistently in the case of precipitation. This suggests that precipitation is more pervasive at the population level, while herbivory act as a spatially aggregating force through individual‐level damage. Synthesis. Our results suggest that accounting for individual and temporal variability in ecological inference greatly improves
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- 2016
12. Conservar Aprovechando. Cómo integrar el cambio global en la gestión de los montes españoles
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Rocio Alonso, Andreu, Jara, Angulo, Elena, A`Vila, Anna, Banqué, Mireia, Bermejo, Victoria, Bernal, Susana, Bonet, Francisco Javier, Lluís Brotons, Calvete, Héctor, Cano, Francesc, Carrillo-Gavilán, Amparo, Castro, Jorge, Caut, Stéphane, Xim Cerdá, Heras, Jorge De Las, Díaz-De-Quijano, María, Díaz, Mario, Miranda, Enrique Doblas, Elvira, Susana, Espelta, Josep María, Estiarte, Marc, Gallart, Francesc, Hécctor García, Gonzalez, Ignacio, Gonzalez-Moreno, Pablo, Gracia, Carlos, Gracia, Marc, Hódar, José Antonio, Kowalski, Andrew S., Llorens, Pilar, Lloret, Francisco, Serrano, Francisco Ramón López, Lupon, Anna, Manzano, Andreu, Marañón, Teodoro, Martínez-Vilalta, Jordi, Moya, Daniel, Ordónez, José Luis, Penuelas, Josep, Poyatos, Rafael, Puerta-Pinero, Carolina, Rábago, Isaura, Retana, Javier, Rodrigo, Anselm, Roura-Pascual, Núria, Sabaté, Santi, Sabater, Francesc, Sanz, Javier, Sardans, Jordi, Serrano-Ortiz, Penélope, Sol, Daniel, Valladares, Fernando, V. Ramón Vallejo1 Jordi Vayreda, Vila, Montserrat, and Regino Zamora
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- 2013
- Full Text
- View/download PDF
13. Efectos del clima y factores locales sobre la regeneración de cinco especies arbóreas en gradientes altitudinales mediterráneos
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Benavides, Raquel, Granda Fernández, Elena, Ferrandis, Pablo, Coll, Lluís, Hódar, José Antonio, Escudero, Adrián, Martínez-Vilalta, Jordi, Peñuelas, Josep, and Valladares Ros, Fernando
- Abstract
El estudio de especies a lo largo de gradientes altitudinales permite explorar las respuestas potenciales de una misma población a escenarios climáticos diferentes. En este trabajo se ha analizado la regeneración de especies arbóreas en gradientes altitudinales con el objetivo de analizar su patrón altitudinal y determinar qué factores locales y climáticos están definiendo este proceso. Se estudiaron cinco de las especies dominantes de los bosques de la Península Ibérica, tres con una distribución boreal con poblaciones en el límite sur de su distribución (Pinus sylvestris, Pinus uncinata y Fagus sylvatica), y otras dos de distribución típicamente mediterránea (Quercus ilex y Pinus nigra). Para ello tomamos datos de densidad y crecimiento primario anual de juveniles y de diversas variables bióticas y abióticas en 306 parcelas agrupadas en 9 localidades. Los crecimientos de los juveniles más jóvenes (< 5 años) presentaron una tendencia común a disminuir al aumentar la altitud, patrón que desapareció con los juveniles de mayor edad. Además se detectó un patrón asimétrico en las tres especies de pino, apareciendo mayores abundancias de juveniles en la mitad superior de su rango altitudinal. En cuanto a los factores que determinan la presencia y abundancia de regeneración hubo gran disparidad entre las especies. Sin embargo, de manera generalizada, se observó un claro efecto directo del clima sobre la demografía y estado de los juveniles de las cinco especies, e importantes interacciones entre éstos y la vegetación herbácea y arbustiva (competencia/facilitación), interacciones a su vez moduladas por el clima
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- 2013
14. Survival vs. growth trade-off in early recruitment challenges global warming impacts on Mediterranean mountain trees
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Ministerio de Ciencia e Innovación (España), European Commission, Comunidad de Madrid, Benavides, Raquel, Escudero, Adrián, Coll, Lluís, Ferrandis, Pablo, Gouriveau, Fabrice, Hódar, José Antonio, Ogaya, Romá, Rabasa, Sonia G., Granda Fernández, Elena, Santamaría Pérez, Blanca, Martínez-Vilalta, Jordi, Zamora, Regino, Espelta, Josep Maria, Peñuelas, Josep, Valladares Ros, Fernando, Ministerio de Ciencia e Innovación (España), European Commission, Comunidad de Madrid, Benavides, Raquel, Escudero, Adrián, Coll, Lluís, Ferrandis, Pablo, Gouriveau, Fabrice, Hódar, José Antonio, Ogaya, Romá, Rabasa, Sonia G., Granda Fernández, Elena, Santamaría Pérez, Blanca, Martínez-Vilalta, Jordi, Zamora, Regino, Espelta, Josep Maria, Peñuelas, Josep, and Valladares Ros, Fernando
- Abstract
© 2015 Geobotanisches Institut ETH, Stiftung Ruebel. Climate change is expected to alter the geographic distribution of many plant species worldwide. However, there is still no clear evidence showing a generalised direction and magnitude of these distribution shifts. Here, we have surveyed, in nine mountainous regions in Spain, an array of tree species along entire elevational ranges, as surrogates of their global climatic ranges, to test for elevational shifts towards cooler locations. We analysed the distribution recruitment patterns of five dominant tree species, recording the abundance and measuring the primary growth of juveniles in 306 plots. Three of the species have a temperate-boreal distribution with populations at their southern edge in the Mediterranean mountain ranges: Pinus sylvestris, Pinus uncinata and Fagus sylvatica; and the other two species have a Mediterranean distribution: Quercus ilex and Pinus nigra. Despite the contrasting phylogenies and biogeographies, we identified a similar pattern in recruitment abundance across species, with an asymmetric distribution of juveniles (more recruits in the middle-upper elevation of their range), but higher annual growths at lower elevations. This survival-growth trade-off at the early recruitment stage may potentially counterbalance at population level the negative effect of global warming on recruit survival at the lower edge of species ranges. These findings suggest a demographic stabilisation process at the early recruitment stage of these tree species, and highlight the importance of considering the different demographic stages across the whole climatic range to understand the effects that climate change may exert on species distributions and population dynamics.
- Published
- 2015
15. Facilitation of tree saplings by nurse plants: microhabitat amelioration or protection against herbivores?
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Gómez Aparicio, Lorena, Zamora Rodríguez, Regino, Castro Gutiérrez, Jorge, Hódar, José Antonio, Junta de Andalucía, European Commission, Ministerio de Ciencia y Tecnología (España), and Ministerio de Educación, Cultura y Deporte (España)
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Facilitation mechanism ,Nurse shrub ,Herbivory pressure ,Mediterranean mountain ,Sapling survival ,Species-specific effect ,Abiotic stress - Abstract
12 pages, 4 figures, 4 tables, 73 references. We thank the Consejería de Medio Ambiente, Junta de Andalucía, and the direction of the National Park, for permission to work in Sierra Nevada. We are especially grateful to Empresa de Transformación Agraria S.A. (TRAGSA) for carrying out the experimental plantations. Jose M. Gómez, Sergio de Haro, Elena Baraza and Daniel García kindly helped with the field work. David Nesbitt looked over the English version of the manuscript., Question: Positive interactions are predicted to be common in communities developing under high physical stress or high herbivory pressure due to neighbour amelioration of limiting physical and consumer stresses, respectively. However, when both stress sources meet in the same community, the relative importance of the two facilitation mechanisms is poorly understood. We ask: What is the relative importance of abiotic vs. biotic mechanisms of facilitation of tree saplings by shrubs in Mediterranean mountain forests? Location: Sierra Nevada, SE Spain (1800-1850 m a.s.l.) Methods: Saplings of four tree taxa (Acer opalus ssp. granatense, Quercus ilex, Pinus nigra ssp. salzmanii and P. sylvestris var. nevadensis) were planted following a 2 × 2 factorial design: two levels of herbivory (control and ungulate exclusion) and two microhabitats (under shrubs and in open areas). Sapling survival and growth were monitored for five years. Results: Shrubs had positive effects on sapling survival both in control and ungulate excluded plots. This effect was species-specific, with shrubs increasing the survival of Acer opalus and Quercus ilex three and twofold, respectively, but having a minor effect on the Pinus species. Herbivory damage was also species-specific, being much higher for Acer opalus than for any other species. Shrubs did not protect saplings of any species against ungulates. Thus, all Acer saplings (the most damaged species) suffered herbivory outside the exclosures, which largely reduced sapling height. Conclusions: Protection from abiotic stress (summer drought and winter frost) was much more relevant than protection from biotic stress (herbivory). However, we propose that the final balance between the two mechanisms can be expected to vary strongly between sites, depending on the relative magnitude of the different sources of stress and the intrinsic traits (e.g. palatability) of the species interacting., This study was supported by a PFPU-MECD grant to L.G.A., the Andalusian government grant (PAI) rnm-220, and projects FEDER 1FD97-0743-CO3-02 and HETEROMED REN2002-04041-CO2-01/GLO from the Spanish Ministry of Science and Technology (MCYT).
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- 2008
16. El aprendizaje del concepto biológico de población: cómo pueden las ciencias sociales y las matemáticas colaborar con la didáctica de la biología
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Jiménez Tejada, María del Pilar, González García, Francisco, and Hódar, José Antonio
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Evolución ,Matemáticas ,Evolution ,Population ,Artículo ,PEDAGOGÍA [UNESCO] ,Ciencias sociales ,Interdisciplinary treatment ,Población ,UNESCO::PEDAGOGÍA ,Mathematics ,Social sciences ,Tratamiento interdisciplinar - Abstract
El concepto de población vertebra gran parte de las áreas en las que se divide la Biología, como son la genética, la ecología, todas aquellas clásicas que implican taxonomía (botánica, zoología, microbiología, etc.) o la más moderna biología de la conservación. También es importante su conocimiento para comprender e interpretar adecuadamente la evolución y sus implicaciones socioculturales en la historia de la humanidad. Además desempeña un papel básico en otras disciplinas como las Matemáticas o las Ciencias Sociales, con las cuales puede tener elementos comunes. Permite, por lo tanto, trabajar de forma interdisciplinar, ofreciendo al alumnado una visión integradora, algo poco usual dado el grado de especialización existente en los diferentes niveles educativos. Nuestro estudio pretende conocer la atención que se presta a este concepto en los libros de texto de Matemáticas y Ciencias Sociales y el tratamiento que se le da por el profesorado en las aulas, con el fin de proponer actuaciones que impliquen a las tres disciplinas en la mejora de su conocimiento., Population is a keystone concept for many areas of Biology, namely genetics, ecology, all those that imply taxonomy (as botanic, zoology, microbiology...) or the new one of conservation biology. Its knowledge is also important in order to adequately understand and realise the evolution and its social implications in human history. Furthermore, it plays a pivotal role in other disciplines as Mathematics or Social Sciences, with which can share some elements. So, this concept allows the interdisciplinary work, allowing to students a integrative view, which is unusual nowadays due to the increasing degree of specialization in the different educational levels. In this study, we gather information on the attention paid to the population concept in textbooks of mathematics and social sciences, as well as the treatment given by teachers, with the aim of provide ideas and activities implying the three disciplines, in order to improve the knowledge of this concept.
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- 2008
17. Applying plant facilitation to forest restoration in Mediterranean ecosystems: a meta-analysis of the use of shrubs as nurse plants
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Gómez Aparicio, Lorena, Zamora Rodríguez, Regino, Gómez Reyes, José M., Hódar, José Antonio, Castro Gutiérrez, Jorge, Baraza Ruíz, Elena, Ministerio de Ciencia y Tecnología (España), Ministerio de Educación, Cultura y Deporte (España), and European Commission
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Nurse shrubs ,Meta-analysis ,Ecological succession ,Spatial and temporal variability ,Plant–plant interactions ,Abiotic stress ,Mediterranean mountains ,Reforestation ,Tree and shrub seedlings - Abstract
11 pages, 4 figures, 1 table, 75 references. We thank the Consejería de Medio Ambiente, Junta de Andalucía, and the Direction of the National Park of Sierra Nevada for permission to field work, constant support and facilities. We are also especially grateful to Empresa de Transformación Agraria S.A. (TRAGSA) for carrying out the experimental reforestation. We thank Sergio de Haro and several students for field assistance. David Nesbitt looked over the English version of the manuscript., After a millenarian history of overexploitation, most forests in the Mediterranean Basin have disappeared, leaving many degraded landscapes that have been recolonized by early successional shrub-dominated communities. Common reforestation techniques treat these shrubs as competitors against newly planted tree seedlings; thus shrubs are cleared before tree plantation. However, empirical studies and theory governing plant– plant interactions suggest that, in stress-prone Mediterranean environments, shrubs can have a net positive effect on recruitment of other species. Between 1997 and 2001, we carried out experimental reforestations in the Sierra Nevada Protected Area (southeast Spain) with the aim of comparing the survival and growth of seedlings planted in open areas (the current reforestation technique) with seedlings planted under the canopy of preexisting shrub species. Over 18 000 seedlings of 11 woody species were planted under 16 different nurse shrubs throughout a broad geographical area. We sought to explore variation in the sign and magnitude of interactions along spatial gradients defined by altitude and aspect. In the present work, we report the results of a meta-analysis conducted with seedling survival and growth data for the first summer following planting, the most critical period for reforestation success in Mediterranean areas. The facilitative effect was consistent in all environmental situations explored (grand mean effect size d1 5 0.89 for survival and 0.27 for growth). However, there were differences in the magnitude of the interaction, depending on the seedling species planted as well as the nurse shrub species involved. Additionally, nurse shrubs had a stronger facilitative effect on seedling survival and growth at low altitudes and sunny, drier slopes than at high altitudes or shady, wetter slopes. Facilitation in the dry years proved higher than in the one wet year. Our results show that pioneer shrubs facilitate the establishment of woody, late-successional Mediterranean species and thus can positively affect reforestation success in many different ecological settings., This study was supported by a PFPU-MECD grant to L. G. and PFPI-MCYT to E. B. and projects FEDER 1FD97-0743-CO3-02 and REN 2001- 4552-E from MCYT.
- Published
- 2004
18. Benefits of using shrubs as nurse plants for reforestation in Mediterranean mountains: a 4-year study
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Castro Gutiérrez, Jorge, Zamora Rodríguez, Regino, Hódar, José Antonio, Gómez Reyes, José M., Gómez Aparicio, Lorena, Ministerio de Ciencia y Tecnología (España), and Ministerio de Educación, Cultura y Deporte (España)
- Subjects
Nurse plants ,Mediterranean ecosystems ,Facilitation ,Pinus ,Silviculture - Abstract
7 pages, 3 figures, 50 references. We thank the Consejería de Medio Ambiente, Junta de Andalucía, for constant support and facilities. We are also especially grateful to the Direction of the National Park for permission to work in Sierra Nevada and to Empresa de Transformación Agraria S.A. (TRAGSA) for carrying out the experimental reforestation. Daniel García kindly helped in the fieldwork, and two anonymous reviewers provided helpful comments that improved the manuscript. David Nesbitt provided linguistic advice., Shrubs are commonly considered competitors of planted seedlings in reforestation programs. However, shrubs can facilitate the establishment of understory seedlings in environments that, like Mediterranean-type ecosystems, are characterized by harsh environmental conditions. In 1997, an experiment was set up in the Sierra Nevada mountains (SE Spain) to test the use of shrubs as nurse plants for an alternative reforestation technique. Two-year-old seedlings of Pinus sylvestris and P. nigra were planted in four microhabitats: 1) open interspaces without vegetation (which is the usual method employed in reforestation programs), 2) under individuals of the shrub Salvia lavandulifolia, 3) under the north side of spiny shrubs and 4) under the south side of spiny shrubs. Seedlings were also distributed in plots with and without access for ungulates in order to test the effect of herbivore damage. We report here the results of survival and growth after four growing seasons, a time span long enough to draw robust conclusions concerning the suitability of this technique. Pine survival was remarkably higher when planted under individuals of Salvia lavandulifolia as compared to open areas (2.6 times for P. sylvestris, 1.8 for P. nigra). The survival of both pine species was also higher when planted on the north side of spiny shrubs, while mortality on the south side was similar to that found in open areas. The reduction of solar radiation by the canopy of shrubs was likely the main factor determining shrub facilitation. The growth of the pines differed among years. However, growth was not inhibited when planted in association with shrubs as compared to open areas in any of the years. Herbivore damage was low, but was mostly concentrated in the leader shoot, exacerbating the deleterious effect of ungulate herbivores on pine growth. We conclude that the use of shrubs as nurse plants for reforestation is a viable technique to increase establishment success of reforestation in Mediterranean-type ecosystems, and might be similarly useful in other waterstressed environments. In addition, this technique offers the advantage of following natural succession, thus minimizing the impact in the community., This study was supported by a PFPI-MEC grant to J.C. and projects FEDER 1FD97-0743-CO3-02 and REN2001-4552-E of the Spanish MCYT to R.Z.
- Published
- 2004
19. Disparity in elevational shifts of European trees in response to recent climate warming
- Author
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Ministerio de Ciencia e Innovación (España), Rabasa, Sonia G., Granda Fernández, Elena, Benavides, Raquel, Kunstler, Georges, Espelta, Josep Maria, Ogaya, Romá, Peñuelas, Josep, Scherer-Lorenzen, Michael, Gil, Wojciech, Grodzki, Wojciech, Ambrozy, Slawomir, Bergh, Johan, Hódar, José Antonio, Zamora, Regino, Valladares Ros, Fernando, Ministerio de Ciencia e Innovación (España), Rabasa, Sonia G., Granda Fernández, Elena, Benavides, Raquel, Kunstler, Georges, Espelta, Josep Maria, Ogaya, Romá, Peñuelas, Josep, Scherer-Lorenzen, Michael, Gil, Wojciech, Grodzki, Wojciech, Ambrozy, Slawomir, Bergh, Johan, Hódar, José Antonio, Zamora, Regino, and Valladares Ros, Fernando
- Abstract
Predicting climate-driven changes in plant distribution is crucial for biodiversity conservation and management under recent climate change. Climate warming is expected to induce movement of species upslope and towards higher latitudes. However, the mechanisms and physiological processes behind the altitudinal and latitudinal distribution range of a tree species are complex and depend on each tree species features and vary over ontogenetic stages. We investigated the altitudinal distribution differences between juvenile and adult individuals of seven major European tree species along elevational transects covering a wide latitudinal range from southern Spain (37°N) to northern Sweden (67°N). By comparing juvenile and adult distributions (shifts on the optimum position and the range limits) we assessed the response of species to present climate conditions in relation to previous conditions that prevailed when adults were established. Mean temperature increased by 0.86 °C on average at our sites during the last decade compared with previous 30-year period. Only one of the species studied, Abies alba, matched the expected predictions under the observed warming, with a maximum abundance of juveniles at higher altitudes than adults. Three species, Fagus sylvatica, Picea abies and Pinus sylvestris, showed an opposite pattern while for other three species, such as Quercus ilex, Acer pseudoplatanus and Q. petraea, we were no able to detect changes in distribution. These findings are in contrast with theoretical predictions and show that tree responses to climate change are complex and are obscured not only by other environmental factors but also by internal processes related to ontogeny and demography. © 2013 John Wiley & Sons Ltd.
- Published
- 2013
20. Direct and indirect effects of climate on demography and early growth of Pinus sylvestris at the rear edge: changing roles of biotic and abiotic factors
- Author
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European Commission, Ministerio de Ciencia e Innovación (España), Benavides, Raquel, Rabasa, Sonia G., Granda Fernández, Elena, Escudero, Adrián, Hódar, José Antonio, Martínez-Vilalta, Jordi, Rincón, Ana, Zamora, Regino, Valladares Ros, Fernando, European Commission, Ministerio de Ciencia e Innovación (España), Benavides, Raquel, Rabasa, Sonia G., Granda Fernández, Elena, Escudero, Adrián, Hódar, José Antonio, Martínez-Vilalta, Jordi, Rincón, Ana, Zamora, Regino, and Valladares Ros, Fernando
- Abstract
Global change triggers shifts in forest composition, with warming and aridification being particularly threatening for the populations located at the rear edge of the species distributions. This is the case of Scots pine (Pinus sylvestris) in the Mediterranean Basin where uncertainties in relation to its dynamics under these changing scenarios are still high. We analysed the relative effect of climate on the recruitment patterns of Scots pine and its interactions with local biotic and abiotic variables at different spatial scales. Number of seedlings and saplings was surveyed, and their annual shoot growth measured in 96 plots located across altitudinal gradients in three different regions in the Iberian Peninsula. We found a significant influence of climate on demography and performance of recruits, with a non-linear effect of temperature on the presence of juveniles, and a positive effect of precipitation on their survival. Abundance of juveniles of P. sylvestris that underwent their first summer drought was skewed towards higher altitudes than the altitudinal mean range of the conspecific adults and the optimum elevation for seedlings¿ emergence. At local level, light availability did not influence juveniles¿ density, but it enhanced their growth. Biotic interactions were found between juveniles and the herb cover (competition) and between the number of newly emerged seedlings and shrubs (facilitation). Results also highlighted the indirect effect that climate exerts over the local factors, modulating the interactions with the pre-existing vegetation that were more evident at more stressful sites. This multiscale approach improves our understanding of the dynamics of these marginal populations and some management criteria can be inferred to boost their conservation under the current global warming.
- Published
- 2013
21. Demografía y crecimiento primario durante la regeneración de tres especies de pino a lo largo de gradientes climáticos
- Author
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European Commission, Ministerio de Ciencia e Innovación (España), Benavides, Raquel, Escudero, A., García-Rabasa, S., Granda Fernández, Elena, Coll, L., Ferrandis, P., Gouriveau, F., Hódar, José Antonio, Rincón, Ana, Martínez-Vilalta, Jordi, Zamora Rodríguez, Regino, Valladares Ros, Fernando, European Commission, Ministerio de Ciencia e Innovación (España), Benavides, Raquel, Escudero, A., García-Rabasa, S., Granda Fernández, Elena, Coll, L., Ferrandis, P., Gouriveau, F., Hódar, José Antonio, Rincón, Ana, Martínez-Vilalta, Jordi, Zamora Rodríguez, Regino, and Valladares Ros, Fernando
- Abstract
La regeneración es un proceso crítico en la dinámica de los bosques, que presenta una marcada heterogeneidad temporal y espacial. En este trabajo se pretende avanzar en el conocimiento de las variables bióticas y abióticas que determinan a escala local la presencia, abundancia y crecimiento primario de plántulas de tres especies de pino: Pinus sylvestris, P. nigra y P. uncinata, y determinar el efecto relativo del clima. Para ello se muestrearon 216 parcelas distribuidas a lo largo de gradientes climáticos en siete localidades montañosas. Se censaron las plántulas recién emergidas y el resto de juveniles, y se midieron los crecimientos anuales. Los resultados mostraron diferencias significativas entre especies con efectos directos e indirectos del clima sobre la demografía y el estado de los juveniles. En las tres especies se apreció que la supervivencia de los juveniles aparecía desplazada hacia altitudes mayores respecto donde se producía el óptimo de la emergencia. Las relaciones locales de competencia y facilitación ejercieron efectos importantes sobre la regeneración de las tres especies, siendo éstos modulados por el clima.
- Published
- 2013
22. Geographical variation in seed production, predation and abortion in Juniperus communis throughout its range in Europe
- Author
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García, Daniel, Zamora Rodríguez, Regino, Gómez, José M., Jordano, Pedro, and Hódar, José Antonio
- Subjects
Mediterranean climate ,education.field_of_study ,Ecology ,Range (biology) ,latitudinal gradients ,Population ,food and beverages ,Plant Science ,Biology ,biology.organism_classification ,Subarctic climate ,Predation ,predispersal seed predation ,Germination ,Seed predation ,seed production ,Juniperus communis ,seed abortion ,distribution boundaries ,education ,geographical patterns ,Ecology, Evolution, Behavior and Systematics - Abstract
1 The geographical variation of seed production, predation and abortion was ana- lysed in Juniperus communis for 31 populations in seven distinct regions throughout the species’ distribution range in Europe, including both the northern and southern boundaries. 2 The number of seeds per cone and the number of filled seeds per cone varied sig- nificantly between geographical regions and among populations within regions. Populations from the Mediterranean mountains (south-east Spain) showed the highest values in the number of seeds per cone but the lowest values in the number of filled seeds per cone. 3 Losses due to predispersal seed predation varied significantly among populations within a region but not between regions, suggesting that predation incidence depends on local-scale factors. Seed abortion rates were higher in southern Iberian populations than in the other regions, and varied significantly among populations and regions. As a result of predation and abortion, seed production was lowest in the Iberian regions. 4 Seed abortion showed a significant quadratic relationship with latitude, with higher values of abortion at either end of the gradient, but particularly at the southern limit. 5 The production of filled seeds declined gradually towards both northern and southern distribution limits. In the Mediterranean mountains (southern limit), low seed production coincided with a marked limitation placed upon natural regenera- tion by summer drought, leading to a demographic bottleneck in populations. Although seed abortion levels were relatively high in the subarctic tundra (northern limit) populations, they were free from predispersal seed predators, suggesting that population viability here may be under less pressure.
- Published
- 2000
23. Facilitation of tree saplings by nurse plants: microhabitat amelioration or protection against herbivores?
- Author
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Junta de Andalucía, European Commission, Ministerio de Ciencia y Tecnología (España), Ministerio de Educación, Cultura y Deporte (España), Gómez Aparicio, Lorena, Zamora Rodríguez, Regino, Castro Gutiérrez, Jorge, Hódar, José Antonio, Junta de Andalucía, European Commission, Ministerio de Ciencia y Tecnología (España), Ministerio de Educación, Cultura y Deporte (España), Gómez Aparicio, Lorena, Zamora Rodríguez, Regino, Castro Gutiérrez, Jorge, and Hódar, José Antonio
- Abstract
Question: Positive interactions are predicted to be common in communities developing under high physical stress or high herbivory pressure due to neighbour amelioration of limiting physical and consumer stresses, respectively. However, when both stress sources meet in the same community, the relative importance of the two facilitation mechanisms is poorly understood. We ask: What is the relative importance of abiotic vs. biotic mechanisms of facilitation of tree saplings by shrubs in Mediterranean mountain forests? Location: Sierra Nevada, SE Spain (1800-1850 m a.s.l.) Methods: Saplings of four tree taxa (Acer opalus ssp. granatense, Quercus ilex, Pinus nigra ssp. salzmanii and P. sylvestris var. nevadensis) were planted following a 2 × 2 factorial design: two levels of herbivory (control and ungulate exclusion) and two microhabitats (under shrubs and in open areas). Sapling survival and growth were monitored for five years. Results: Shrubs had positive effects on sapling survival both in control and ungulate excluded plots. This effect was species-specific, with shrubs increasing the survival of Acer opalus and Quercus ilex three and twofold, respectively, but having a minor effect on the Pinus species. Herbivory damage was also species-specific, being much higher for Acer opalus than for any other species. Shrubs did not protect saplings of any species against ungulates. Thus, all Acer saplings (the most damaged species) suffered herbivory outside the exclosures, which largely reduced sapling height. Conclusions: Protection from abiotic stress (summer drought and winter frost) was much more relevant than protection from biotic stress (herbivory). However, we propose that the final balance between the two mechanisms can be expected to vary strongly between sites, depending on the relative magnitude of the different sources of stress and the intrinsic traits (e.g. palatability) of the species interacting.
- Published
- 2008
24. Applying plant facilitation to forest restoration in Mediterranean ecosystems: a meta-analysis of the use of shrubs as nurse plants
- Author
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Ministerio de Ciencia y Tecnología (España), Ministerio de Educación, Cultura y Deporte (España), European Commission, Gómez Aparicio, Lorena, Zamora Rodríguez, Regino, Gómez Reyes, José M., Hódar, José Antonio, Castro Gutiérrez, Jorge, Baraza Ruíz, Elena, Ministerio de Ciencia y Tecnología (España), Ministerio de Educación, Cultura y Deporte (España), European Commission, Gómez Aparicio, Lorena, Zamora Rodríguez, Regino, Gómez Reyes, José M., Hódar, José Antonio, Castro Gutiérrez, Jorge, and Baraza Ruíz, Elena
- Abstract
After a millenarian history of overexploitation, most forests in the Mediterranean Basin have disappeared, leaving many degraded landscapes that have been recolonized by early successional shrub-dominated communities. Common reforestation techniques treat these shrubs as competitors against newly planted tree seedlings; thus shrubs are cleared before tree plantation. However, empirical studies and theory governing plant– plant interactions suggest that, in stress-prone Mediterranean environments, shrubs can have a net positive effect on recruitment of other species. Between 1997 and 2001, we carried out experimental reforestations in the Sierra Nevada Protected Area (southeast Spain) with the aim of comparing the survival and growth of seedlings planted in open areas (the current reforestation technique) with seedlings planted under the canopy of preexisting shrub species. Over 18 000 seedlings of 11 woody species were planted under 16 different nurse shrubs throughout a broad geographical area. We sought to explore variation in the sign and magnitude of interactions along spatial gradients defined by altitude and aspect. In the present work, we report the results of a meta-analysis conducted with seedling survival and growth data for the first summer following planting, the most critical period for reforestation success in Mediterranean areas. The facilitative effect was consistent in all environmental situations explored (grand mean effect size d1 5 0.89 for survival and 0.27 for growth). However, there were differences in the magnitude of the interaction, depending on the seedling species planted as well as the nurse shrub species involved. Additionally, nurse shrubs had a stronger facilitative effect on seedling survival and growth at low altitudes and sunny, drier slopes than at high altitudes or shady, wetter slopes. Facilitation in the dry years proved higher than in the one wet year. Our results show that pioneer shrubs facilitate the establishment of woody
- Published
- 2004
25. Benefits of using shrubs as nurse plants for reforestation in Mediterranean mountains: a 4-year study
- Author
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Ministerio de Ciencia y Tecnología (España), Ministerio de Educación, Cultura y Deporte (España), Castro Gutiérrez, Jorge, Zamora Rodríguez, Regino, Hódar, José Antonio, Gómez Reyes, José M., Gómez Aparicio, Lorena, Ministerio de Ciencia y Tecnología (España), Ministerio de Educación, Cultura y Deporte (España), Castro Gutiérrez, Jorge, Zamora Rodríguez, Regino, Hódar, José Antonio, Gómez Reyes, José M., and Gómez Aparicio, Lorena
- Abstract
Shrubs are commonly considered competitors of planted seedlings in reforestation programs. However, shrubs can facilitate the establishment of understory seedlings in environments that, like Mediterranean-type ecosystems, are characterized by harsh environmental conditions. In 1997, an experiment was set up in the Sierra Nevada mountains (SE Spain) to test the use of shrubs as nurse plants for an alternative reforestation technique. Two-year-old seedlings of Pinus sylvestris and P. nigra were planted in four microhabitats: 1) open interspaces without vegetation (which is the usual method employed in reforestation programs), 2) under individuals of the shrub Salvia lavandulifolia, 3) under the north side of spiny shrubs and 4) under the south side of spiny shrubs. Seedlings were also distributed in plots with and without access for ungulates in order to test the effect of herbivore damage. We report here the results of survival and growth after four growing seasons, a time span long enough to draw robust conclusions concerning the suitability of this technique. Pine survival was remarkably higher when planted under individuals of Salvia lavandulifolia as compared to open areas (2.6 times for P. sylvestris, 1.8 for P. nigra). The survival of both pine species was also higher when planted on the north side of spiny shrubs, while mortality on the south side was similar to that found in open areas. The reduction of solar radiation by the canopy of shrubs was likely the main factor determining shrub facilitation. The growth of the pines differed among years. However, growth was not inhibited when planted in association with shrubs as compared to open areas in any of the years. Herbivore damage was low, but was mostly concentrated in the leader shoot, exacerbating the deleterious effect of ungulate herbivores on pine growth. We conclude that the use of shrubs as nurse plants for reforestation is a viable technique to increase establishment success of reforestation in Medit
- Published
- 2004
26. Doñana. Acta vertebrata. vol 22 (1/2)
- Author
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Atienza, Juan Carlos, Illera, Juan Carlos, Richard, Enrique, Julia, Juan P., Aceñolaza, Pablo G., Zapata, Socia C., Travaini, Alejandro, Delibes, M., Aragón, Santiago, Braza, Francisco, San José, Cristina, Codenotti, T.L., Beninca, Delcio, Álvarez, Fernando, Cueto, Víctor R., Sánchez, Marta I., Piantanida, Martha J., Palazón, Santiago, Ruiz-Olmo, Jordi, Paracuellos, Mariano, Nevado, Juan Carlos, González-Esteban, Jorge, Villate, I., Gosálbez, Joaquim, Hódar, José Antonio, Román, Jacinto, Pérez de Ana, Juan M., Figuerola, Jordi, Bertolero, Albert, and Junta de Andalucía
- Abstract
Relación entre el uso del espacio del mito (Aeghitalos caudatus) y la disponibilidad de artrópodos durante el periodo primavera-verano, Hábitos frugívoros de la corzuela parda (Mazama gouazoubira, Ficher, 1814) (Mammalia: Cervidae), en un ambiente secundario de yungas, Comparación entre varias técnicas de estimación de la edad en zorros, Vulpes vulpes, de Doñana (sur de la Península Ibérica), Características morfológicas de los corzos (Capreolus capreolus) de las sierras de Cádiz-Málaga., Etograma y relación de la conducta con el hábitat y con la edad en el ñandú (Rhea americana), Variación estacional del área de campeo de Oxymycterus rufus (Rodentia: Cricetidae), en el delta del rio Paraná, Argentina, Tracking of a female american mink (Mustela vison, Schreber, 1777) in NE Spain., Nidificación de láridos en la provincia de Almeria (SE Ibérico), Expansión del área de distribución de Microtus arvalis asturianus Miller, 1908 (Rodentia, Arvicolidae) en la meseta norte (España), Diet of the thekla lark, Galerida theklae, in a shrubsteppe of southeastern Spain, Alimentación de la lechuza campestre (Asio flammeus) en la submeseta norte (España), durante el periodo reproductor, Uso de cajas anidaderas por lirones grises (Glis glis) y ratones leonados (Apodemus flavicollis) en el norte de la Península Ibérica., Theoretical flight ranges of waders resting in the Ebro Delta during autumn migration
- Published
- 1995
27. Is insecticide spraying a viable and cost-efficient management practice to control pine processionary moth in Mediterranean woodlands?
- Author
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Cayuela, Luis, primary, Hódar, José Antonio, additional, and Zamora, Regino, additional
- Published
- 2011
- Full Text
- View/download PDF
28. Doñana. Acta vertebrata. vol 22 (1/2)
- Author
-
Junta de Andalucía, Atienza, Juan Carlos, Illera, Juan Carlos, Richard, Enrique, Julia, Juan P., Aceñolaza, Pablo G., Zapata, Socia C., Travaini, Alejandro, Delibes, M., Aragón, Santiago, Braza, Francisco, San José, Cristina, Codenotti, T.L., Beninca, Delcio, Álvarez, Fernando, Cueto, Víctor R., Sánchez, Marta I., Piantanida, Martha J., Palazón, Santiago, Ruiz-Olmo, Jordi, Paracuellos, Mariano, Nevado, Juan Carlos, González-Esteban, Jorge, Villate, I., Gosálbez, Joaquim, Hódar, José Antonio, Román, Jacinto, Pérez de Ana, Juan M., Figuerola, Jordi, Bertolero, Albert, Junta de Andalucía, Atienza, Juan Carlos, Illera, Juan Carlos, Richard, Enrique, Julia, Juan P., Aceñolaza, Pablo G., Zapata, Socia C., Travaini, Alejandro, Delibes, M., Aragón, Santiago, Braza, Francisco, San José, Cristina, Codenotti, T.L., Beninca, Delcio, Álvarez, Fernando, Cueto, Víctor R., Sánchez, Marta I., Piantanida, Martha J., Palazón, Santiago, Ruiz-Olmo, Jordi, Paracuellos, Mariano, Nevado, Juan Carlos, González-Esteban, Jorge, Villate, I., Gosálbez, Joaquim, Hódar, José Antonio, Román, Jacinto, Pérez de Ana, Juan M., Figuerola, Jordi, and Bertolero, Albert
- Published
- 1995
29. We Are What We Eat: A Stoichiometric and Ecometabolomic Study of Caterpillars Feeding on Two Pine Subspecies of Pinus sylvestris.
- Author
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Rivas-Ubach, Albert, Peñuelas, Josep, Hódar, José Antonio, Oravec, Michal, Paša-Tolić, Ljiljana, Urban, Otmar, and Sardans, Jordi
- Subjects
SCOTS pine ,CATERPILLARS ,METABOLISM ,THAUMETOPOEA ,STOICHIOMETRY - Abstract
Many studies have addressed several plant-insect interaction topics at nutritional, molecular, physiological, and evolutionary levels. However, it is still unknown how flexible the metabolism and the nutritional content of specialist insect herbivores feeding on different closely related plants can be. We performed elemental, stoichiometric, and metabolomics analyses on leaves of two coexisting Pinus sylvestris subspecies and on their main insect herbivore; the caterpillar of the processionary moth (Thaumetopoea pityocampa). Caterpillars feeding on different pine subspecies had distinct overall metabolome structure, accounting for over 10% of the total variability. Although plants and insects have very divergent metabolomes, caterpillars showed certain resemblance to their plant-host metabolome. In addition, few plant-related secondary metabolites were found accumulated in caterpillar tissues which could potentially be used for self-defense. Caterpillars feeding on N and P richer needles had lower N and P tissue concentration and higher C:N and C:P ratios, suggesting that nutrient transfer is not necessarily linear through trophic levels and other plant-metabolic factors could be interfering. This exploratory study showed that little chemical differences between plant food sources can impact the overall metabolome of specialist insect herbivores. Significant nutritional shifts in herbivore tissues could lead to larger changes of the trophic web structure. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
30. EL TRABAJO EN LAS AULAS CON LOS CONCEPTOS DE POBLACIÓN Y ESPECIE.
- Author
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Del Pilar Jiménez Tejada, María, González García, Francisco, and Hódar, José Antonio
- Subjects
- *
BIOLOGY education , *SPECIES , *POPULATION education , *LEARNING , *HIGH school teaching , *BIOLOGICAL evolution , *EDUCATION - Abstract
The notions of population and species, both of them closely related to the theory of evolution, are some of most important ones in Biology. Unlike what has happened with these two fundamental concepts when trying to understand evolution, much didactic research has been devoted to the notion of evolution itself. In this study, the results of a survey about these two concepts applied to high school teachers from the Maule region in Chile, and from Andalusia in Spain, are presented. The findings show that teachers do not perceive great difficulties in the students' understanding of those concepts. This might be the reason why not much attention is paid to some aspects discussed here which could improve both the teaching and learning of those concepts. [ABSTRACT FROM AUTHOR]
- Published
- 2009
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