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14 results on '"Camila Rocca"'

1. Environmental heterogeneity modulates the effect of plant diversity on the spatial variability of grassland biomass

Author

Pedro Daleo, Juan Alberti, Enrique J. Chaneton, Oscar Iribarne, Pedro M. Tognetti, Jonathan D. Bakker, Elizabeth T. Borer, Martín Bruschetti, Andrew S. MacDougall, Jesús Pascual, Mahesh Sankaran, Eric W. Seabloom, Shaopeng Wang, Sumanta Bagchi, Lars A. Brudvig, Jane A. Catford, Chris R. Dickman, Timothy L. Dickson, Ian Donohue, Nico Eisenhauer, Daniel S. Gruner, Sylvia Haider, Anke Jentsch, Johannes M. H. Knops, Ylva Lekberg, Rebecca L. McCulley, Joslin L. Moore, Brent Mortensen, Timothy Ohlert, Meelis Pärtel, Pablo L. Peri, Sally A. Power, Anita C. Risch, Camila Rocca, Nicholas G. Smith, Carly Stevens, Riin Tamme, G. F. (Ciska) Veen, Peter A. Wilfahrt, and Yann Hautier

Subjects
Science
Abstract

The insurance hypothesis posits that more diverse communities are more stable through time. Here, the authors show that plant biodiversity reduces the spatial variability of productivity in grassland communities, demonstrating that the insurance hypothesis applies also across space.

Published
2023
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2. South West Atlantic salt marshes as model systems for community and ecosystem ecology

Author

Pedro Daleo, Juan Alberti, Diana I. Montemayor, Micaela Giorgini, Florencia Botto, Jesús Pascual, Camila Rocca, and Oscar Iribarne

Subjects
drivers of community organization, ecological theory, ecosystem function, Environmental sciences, GE1-350, Ecology, QH540-549.5
Abstract

Just as some species are used as model systems in organismal biology (e.g., physiology, genetics), many ecosystems are commonly used as model systems in ecology. Salt marshes, for instance, are great models to perform manipulative field experiments, and thus, were historically used to understand the drivers of community and ecosystem function. Decades of experimental work, indeed, made a strong contribution to community ecology as a discipline, but most of the emerged hypotheses and models were grounded in a few sites. When studies from new sites came onboard, looking to enlarge generalities, their results challenged the prevailing ideas. Here, we review more than 25 years of intense experimentation in South West Atlantic salt marshes, which helped not only to increase the knowledge about salt marsh functioning, but also to expand this knowledge beyond salt marshes helping to refine community and ecosystem function theory. We show that results coming from SW Atlantic marshes significantly contribute to understand 1) the separate and interactive effect of biotic and abiotic stress for species distribution and even for ecosystem stability, 2) the integrated role of species that can function as ecosystem engineers and as consumers, 3) the balance between stochastic and deterministic forces as drivers of community structure and 4) the regulation of cross-ecosystem fluxes. Nevertheless, we believe SW Atlantic salt marshes still have a lot more to offer, not only as conceptual models that help satisfy our intellectual curiosity, but also as key ecosystems that provide valuable benefits to our societies.

Published
2022
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5. Flood‐stimulated herbivory drives range retraction of a plant ecosystem

Author

Brian R. Silliman, Camila Rocca, Juan Alberti, Pedro Daleo, Jesus Dario Nuñez, Oscar Iribarne, and Christine Angelini

Subjects
Herbivore, geography, geography.geographical_feature_category, Ecology, Flood myth, Range (biology), Salt marsh, Climate change, Environmental science, Ecosystem, Plant Science, Ecology, Evolution, Behavior and Systematics
Published
2021

6. Latitudinal pattern of the thermal sensitivity of running speed in the endemic lizard Liolaemus multimaculatus

Author

Laura Estela Vega, Carolina Block, Oscar Aníbal Stellatelli, Patricio J. Bellagamba, Juan Esteban Dajil, Felix Benjamin Cruz, and Camila Rocca

Subjects
biology, Range (biology), Lizard, Temperature, Liolaemus multimaculatus, Lizards, Liolaemus, biology.organism_classification, Atmospheric sciences, Liolaemidae, Latitude, Running, Cold Temperature, biology.animal, Thermal, Environmental science, Animals, Animal Science and Zoology, Relative humidity, Body Temperature Regulation
Abstract

Physiological performance in lizards may be affected by climate across latitudinal or altitudinal gradients. In the coastal dune barriers in central-eastern Argentina, the annual maximum environmental temperature decreases up to 2°C from low to high latitudes, while the mean relative humidity of the air decreases from 50% to 25%. Liolaemus multimaculatus, a lizard in the family Liolaemidae, is restricted to these coastal dunes. We investigated the locomotor performance of the species at 6 different sites distributed throughout its range in these dune barriers. We inquired whether locomotor performance metrics were sensitive to the thermal regime attributable to latitude. The thermal performance breadth increased from 7% to 82% with latitude, due to a decrease in its critical thermal minimum of up to 5°C at higher latitudes. Lizards from high latitude sites showed a thermal optimum, that is, the body temperature at which maximum speed is achieved, up to 4°C lower than that of lizards from the low latitude. At relatively low temperatures, the maximum running speed of high-latitude individuals was faster than that of low-latitude ones. Thermal parameters of locomotor performance were labile, decreasing as a function of latitude. These results show populations of L. multimaculatus adjust thermal physiology to cope with local climatic variations. This suggests that thermal sensitivity responds to the magnitude of latitudinal fluctuations in environmental temperature.

Published
2021

7. Herbivory and dropping effects by small mammals on salt‐marsh vegetation vary across microhabitats

Author

Oscar Iribarne, Camila Rocca, Juan Alberti, Jesus Pascual, Eugenia Fanjul, and Pedro Daleo

Subjects
Herbivore, Biomass (ecology), geography, geography.geographical_feature_category, Ecology, PLANT SPECIES RICHNESS, Plant community, Wetland, Plant Science, Ecología, Ciencias Biológicas, DROPPINGS, Nutrient, SALT MARSH, Salt marsh, Environmental science, Species richness, SMALL MAMMALS, HERBIVORY, Salt marsh vegetation, CONTEXT DEPENDENCE, CIENCIAS NATURALES Y EXACTAS
Abstract

Question: Does the effect of droppings and herbivory by wild guinea pigs on salt-marsh vegetation vary across microhabitats?. Location: Upper salt marsh in the Mar Chiquita coastal lagoon (37°44′52″ S, 57°26′6″ W, Argentina). Methods: During autumn 2014, we performed a micro-scale experiment manipulating droppings of wild guinea pigs (Cavia aperea). After 15 days, we compared the content of nutrients (i.e., NH4+, NO3−, and PO43−) in soil. Then, we started two factorial experiments in the high marsh, specifically one in marsh matrix (i.e., tall vegetation) and the other in open patches (i.e., short vegetation). Units were randomly assigned to different treatments (with and without herbivores and droppings). In early summer, we compared total plant cover, maximum height, above-ground biomass, plant species richness and the composition of plant assemblages between treatments. Results: Droppings increased the content of PO43− in soil by five times, but decreased the content of NO3−. Herbivory reduced total cover, plant height, and above-ground biomass in the marsh matrix and the open patches. In the marsh matrix, droppings increased the total cover, whereas herbivory reduced the abundance of Spartina densiflora (cover and above-ground biomass) and subordinate species (cover). Additionally, the cover of subordinate species was negatively associated with the cover of Spartina densiflora. Therefore, in the marsh matrix, by increasing light availability at the ground level, herbivory increased plant species richness, but with low cover of subordinate species. In contrast, in open patches, herbivory and droppings interacted to reduce plant species richness. Conclusion: Herbivory by small mammals can control the above-ground biomass, structure, and plant community composition of the high marsh, but non-trophic mechanisms (droppings) can also affect community composition. Nonetheless, ecological impacts of small mammals depend on the context, because the magnitude and direction of trophic (herbivory) and non-trophic (droppings) effects change across microhabitats. Fil: Pascual, Jesus Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina Fil: Alberti, Juan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina Fil: Daleo, Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina Fil: Fanjul, Maria Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina Fil: Rocca, Camila. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina Fil: Iribarne, Oscar Osvaldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina

Published
2019

9. Latitudinal comparison of the thermal biology in the endemic lizard Liolaemus multimaculatus

Author

Camila Rocca, Oscar Aníbal Stellatelli, Laura Estela Vega, Patricio J. Bellagamba, Felix Benjamin Cruz, and Carolina Block

Subjects
0106 biological sciences, Physiology, Range (biology), THERMOREGULATION, 030310 physiology, Endangered species, Argentina, Wind, Biology, 010603 evolutionary biology, 01 natural sciences, Biochemistry, Ciencias Biológicas, 03 medical and health sciences, Environmental temperature, biology.animal, Animals, REPTILE, GEOGRAPHIC GRADIENT, 0303 health sciences, Geography, Ecology, Lizard, Temperature, Liolaemus multimaculatus, Humidity, Lizards, Zoología, Ornitología, Entomología, Etología, Microclimate, Thermoregulation, TEMPERATURE CHANGE, ENDANGERED SPECIES, Ectotherm, Spatial ecology, General Agricultural and Biological Sciences, CIENCIAS NATURALES Y EXACTAS, Developmental Biology, Body Temperature Regulation
Abstract

Thermoregulation in ectotherms may be modulated by climatic variability across geographic gradients. Environmental temperature varies along latitudinal clines resulting in heterogeneous thermal resource availability, which generally induces ectotherms to use compensatory mechanisms to thermoregulate. Lizards can accommodate to ambient temperature changes through a combination of adaptive evolution and behavioral and physiological plasticity. We studied the thermal ecology of the endangered endemic lizard Liolaemus multimaculatus at six different sites distributed from the northern to southern areas of the distribution (700 km) in the Atlantic dune barriers of Argentina, and even including the borders areas of the distribution range. Environmental temperatures and relative humidity showed a strong contrast between northern and southern limits of the distribution range. The northern localities had operative temperatures (Te) above the range of preferred temperatures (Tset), instead, the southern localities had large proportion of Tes within the Tset. Although these different climatic conditions may constrain the thermal biology of L. multimaculatus, individuals from all localities maintained relatively similar field body temperatures (XTb = 34.07 ± 3.02 °C), suggesting that this parameter is conservative. Thermal preference partially reflected latitudinal temperature gradient, since lizards from the two southernmost localities showed the lowest Tsel and Tset. Thermoregulatory efficiency differed among localities, since E values in the northern localities (E = 0.53–0.69) showed less variability than those of southern localities (E = 0.14–0.67). Although L. multimaculatus employed a strategy of having a conservative Tb and being able to acclimatize the thermal preference to copes with latitudinal changes in the thermal environment, other local factors, such as ecological interactions, may also impose limitations to thermoregulation and this may interfered in the interpretation of results at wider spatial scale. Fil: Stellatelli, Oscar Aníbal. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina Fil: Vega, Laura Estela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina Fil: Block, Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina Fil: Rocca, Camila. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina Fil: Bellagamba, Patricio Juan. Provincia de Buenos Aires. Municipalidad de General Pueyrredon; Argentina Fil: Cruz, Felix Benjamin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina

Published
2019

12. Los devenires minoritarios en los cuentos de Clarice Lispector: condiciones de una cartografía deseante

Author

Camila Roccatagliata

Subjects
literatura menor, devenir minoritario, nomadismo, deseo, rizoma, Literature (General), PN1-6790
Abstract

Gilles Deleuze y Félix Guattari en su Kafka. Por una literatura menor atribuyen a una literatura menor tres características fundamentales: el uso minoritorio de una lengua mayor, el carácter social y político por sobre el individual en el texto y el valor colectivo de la obra. El propósito del presente trabajo consiste en ver de qué manera esas características se conjugan en los cuentos de Clarice Lispector para obtener como resultado un recorrido por el Brasil minoritario y deseante.

Published
2011
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13. La lengua que desea. El asco y el buen gusto en La lengua del malón de Guillermo Saccomanno / The desiring tongue. Disgust and good taste in La lengua del malón by Guillermo Saccomanno

Author

Camila Roccatagliata

Subjects
La lengua del malón, Guillermo Saccomanno, novela, literatura argentina, siglo XX, Philology. Linguistics, P1-1091, French literature - Italian literature - Spanish literature - Portuguese literature, PQ1-3999
Abstract

La memoria de un pueblo se construye a partir del choque entre distintos discursos y sectores que pugnan por ocupar un lugar privilegiado en ese espacio simbólico colectivo. Otros discursos operan deconstruyendo esos relatos hegemónicos, denunciando los que estos han dejado de lado y otorgando voz a aquellos que han sido sistemáticamente silenciados. El trabajo intenta dar cuenta de cómo La lengua del malón (2004), novela de Guillermo Saccomanno, se erige como un contradiscurso que permite vislumbrar cuál es la posición de ciertos sectores sociales respecto de los discursos y dispositivos que establecen qué es lo adecuado, moral, vulgar, de buen gusto, normal. Asimismo, devela la complicidad de estos sectores en el mantenimiento de jerarquías, categorías e instituciones conservadoras, opresivas y represivas y sus alianzas con quienes interrumpieron procesos democráticos y populares. La novela se centra en el golpe de Estado que derrocó a Juan Domingo Perón en 1955 y deja entrever las relaciones de continuidad con otros momentos trágicos de la historia argentina: el exterminio de los pueblos originarios y la dictadura de 1976. La lengua del malón se construye como un relato de la abyección que sufren quienes no responden a esos parámetros hegemónicos que sostienen tanto a la “historia oficial” como a la sociedad. Palabras clave: La lengua del malón; Guillermo Saccomanno; novela; literatura argentina: siglo XX

Published
2014
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