5 results on '"Anna Mrazova"'
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2. Exogenous application of methyl jasmonate to Ficus hahliana attracts predators of insects along an altitudinal gradient in Papua New Guinea
- Author
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Katerina Sam and Anna Mrazova
- Subjects
0106 biological sciences ,Herbivore ,Methyl jasmonate ,biology ,Ecology ,media_common.quotation_subject ,Ficus ,Insect ,biology.organism_classification ,010603 evolutionary biology ,01 natural sciences ,Predation ,law.invention ,chemistry.chemical_compound ,chemistry ,law ,Plasticine ,Arthropod ,Species richness ,Ecology, Evolution, Behavior and Systematics ,010606 plant biology & botany ,media_common - Abstract
In many plants, the defence systems against herbivores are induced, and may be involved in recruiting the natural enemies of herbivores. We used methyl jasmonate, a well-known inducer of plant defence responses, to manipulate the chemistry of Ficus hahliana along a tropical altitudinal gradient in order to test its ability to attract the enemies of herbivores. We examined whether chemical signals from MeJA-treated trees (simulating leaf damage by herbivores) attracted insect enemies in the complex settings of a tropical forest; and how this ability changes with altitude, where the communities of predators differ naturally. We conducted the research at four study sites (200, 700, 1700 and 2700 m asl) of Mt Wilhelm in Papua New Guinea. Using dummy plasticine caterpillars to assess predation on herbivorous insect, we showed that, on average, inducing plant defences with jasmonic acid in this tropical forest increases predation twofold (i.e. caterpillars exposed on MeJA-sprayed trees were attacked twice as often as caterpillars exposed on control trees). The predation rate on control trees decreased with increasing altitude from 20.2% d−1 at 200 m asl to 4.7% d−1 at 2700 m asl. Predation on MeJA-treated trees peaked at 700 m (52.3% d−1) and decreased to 20.8% d−1 at 2700 m asl. Arthropod predators (i.e. ants and wasps) caused relatively more attacks in the lowlands (200–700 m asl), while birds became the dominant predators above 1700 m asl. The predation pressure from birds and arthropods corresponded with their relative abundances, but not with their species richness. Our study found a connection between chemically induced defence in plants and their attractivity to predators of herbivorous insect in the tropics.
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- 2019
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3. Search for top‐down and bottom‐up drivers of latitudinal trends in insect herbivory in oak trees in Europe
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Ágnes Fürjes-Mikó, Yasmine Kadiri, Thomas Damestoy, Marco Ferrante, Andreas Schuldt, Csaba Béla Eötvös, Arndt Hampe, Marketa Tahadlova, Mihai-Leonard Duduman, Luc Barbaro, Anna Mrazova, Ayco J. M. Tack, Tomas Roslin, Slobodan Milanović, Maria Faticov, Michèle Kaennel-Dobbertin, Andreas Prinzing, György Csóka, Aurélien Sallé, Deborah J. Harvey, Gábor L. Lövei, Katerina Sam, Olivier Bouriaud, Xoaquín Moreira, Michael Scherer-Lorenzen, Lars Opgennoorth, Martin M. Gossner, Juha-Matti Pitkänen, Andrea Galmán, Laurent Augusto, Giada Centenaro, Julia Koricheva, Anne-Maïmiti Dulaurent, Jovan Dobrosavljević, Andrey V. Selikhovkin, Marija Popović, Elena Valdés-Correcher, Manuela Branco, D. Lupaştean, Valentin Queloz, Lassi Suominen, Christophe Bouget, Mikhail V. Kozlov, Rebecca L. Thomas, Anna Yu. Popova, Bastien Castagneyrol, Andy G. Howe, Alexander Kozel, Biodiversité, Gènes & Communautés (BioGeCo), Université de Bordeaux (UB)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Misión Biológica de Galicia, Spanish National Research Council (CSIC), Interactions Sol Plante Atmosphère (UMR ISPA), Ecole Nationale Supérieure des Sciences Agronomiques de Bordeaux-Aquitaine (Bordeaux Sciences Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Dynamiques et écologie des paysages agriforestiers (DYNAFOR), École nationale supérieure agronomique de Toulouse [ENSAT]-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Ecosystèmes forestiers (UR EFNO), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), University Stefan cel Mare of Suceava (USU), Universidade de Lisboa (ULISBOA), Universita degli Studi di Padova, National Agricultural Research and Innovation Center (NARIC), Agro-écologie, Hydrogéochimie, Milieux et Ressources (AGHYLE), UniLaSalle, Ecosystèmes, biodiversité, évolution [Rennes] (ECOBIO), Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), ANR-10-LABX-0045,COTE,COntinental To coastal Ecosystems: evolution, adaptability and governance(2010), Mision Biologica de Galicia (MBG), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), École nationale supérieure agronomique de Toulouse (ENSAT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Centre d'Ecologie et des Sciences de la COnservation (CESCO), Muséum national d'Histoire naturelle (MNHN)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Universidade de Lisboa = University of Lisbon (ULISBOA), Università degli Studi di Padova = University of Padua (Unipd), University of Belgrade [Belgrade], Universitatea Stefan cel Mare Suceava (USU), Stockholm University, Aarhus University [Aarhus], University of the Azores, Swiss Federal Research Institute, Royal Holloway [University of London] (RHUL), University of Copenhagen = Københavns Universitet (UCPH), Université de Rennes (UR)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS), Georg-August-University = Georg-August-Universität Göttingen, Saint Petersburg State University (SPBU), Biology Centre of the Czech Academy of Sciences (BIOLOGY CENTRE CAS), Czech Academy of Sciences [Prague] (CAS), University of South Bohemia, and This study was carried out with financial support from the French National Research Agency (ANR) in the frame of the Investments for the Future Programme, within the Cluster of Excellence COTE (Continental To coastal Ecosystems: evolution, adaptability and governance) (ANR-10-LABX-45). E.V.C. was funded by the BiodivERsA (BiodivERsA is a network of national and regional funding organisations promoting pan-European research on biodiversity and ecosystem services, and offering innovative opportunities for the conservation and sustainable management of biodiversity) project SPONFOREST (Unraveling the potential of spontaneous forest establishment for improving ecosystem functions and services in dynamic landscapes) (BiodivERsA3-2015-58). The authors warmly thank all the young European citizens and their teachers who made this study possible. They also thank the professional scientists who kindly agreed to participate in this study: Stefan K. Müller (Freie evangelische Schule Lörrach), Olga Mijón Pedreira (teacher IES Rosais 2, Vigo-Spain) and Mickael Pihain (Research Unit 'Ecosystèmes, Biodiversité, Evolution', University of Rennes 1/CNRS, 35042 Rennes, France), and Chloe Mendiondo and Claire Colliaux (Department of Agroecology, Aarhus University, Flakkebjerg Research Centre, DK-4200 Slagelse, Denmark).
- Subjects
0106 biological sciences ,защита растений ,Range (biology) ,Leaf Chemistry ,media_common.quotation_subject ,Climate ,Plant Defences ,Nutritional quality ,Insect ,Plant defences ,010603 evolutionary biology ,01 natural sciences ,Latitude ,Quercus robur ,biotic interactions ,биотические факторы ,Avian Insectivory ,Artificial Prey ,Avian insectivory ,Natural enemies ,climatic gradients ,pedunculate oak ,Ecology, Evolution, Behavior and Systematics ,media_common ,2. Zero hunger ,[SDV.EE]Life Sciences [q-bio]/Ecology, environment ,Global and Planetary Change ,Herbivore ,насекомые-вредители ,Ecology ,biology ,010604 marine biology & hydrobiology ,Artificial prey ,климатические градиенты ,15. Life on land ,Latitudinal gradients ,biology.organism_classification ,климатические факторы ,climatic factors ,Taxon ,13. Climate action ,широтные градиенты ,Leaf chemistry ,herbivorous insects ,травоядные насекомые ,дуб черешчатый ,010606 plant biology & botany - Abstract
AIM: The strength of species interactions is traditionally expected to increase toward the Equator. However, recent studies have reported opposite or inconsistent latitudinal trends in the bottom-up (plant quality) and top-down (natural enemies) forces driving herbivory. In addition, these forces have rarely been studied together thus limiting previous attempts to understand the effect of large-scale climatic gradients on herbivory. LOCATION: Europe. TIME PERIOD: 2018–2019. MAJOR TAXA STUDIED: Quercus robur. METHODS: We simultaneously tested for latitudinal variation in plant–herbivore–natural enemy interactions. We further investigated the underlying climatic factors associated with variation in herbivory, leaf chemistry and attack rates in Quercus robur across its complete latitudinal range in Europe. We quantified insect leaf damage and the incidence of specialist herbivores as well as leaf chemistry and bird attack rates on dummy caterpillars on 261 oak trees. RESULTS: Climatic factors rather than latitude per se were the best predictors of the large-scale (geographical) variation in the incidence of gall-inducers and leaf-miners as well as in leaf nutritional content. However, leaf damage, plant chemical defences (leaf phenolics) and bird attack rates were not influenced by climatic factors or latitude. The incidence of leaf-miners increased with increasing concentrations of hydrolysable tannins, whereas the incidence of gall-inducers increased with increasing leaf soluble sugar concentration and decreased with increasing leaf C : N ratios and lignins. However, leaf traits and bird attack rates did not vary with leaf damage. MAIN CONCLUSIONS: These findings help to refine our understanding of the bottom-up and top-down mechanisms driving geographical variation in plant–herbivore interactions, and indicate the need for further examination of the drivers of herbivory on trees. This study was carried out with financial support from the French National Research Agency (ANR) in the frame of the Investments for the Future Programme, within the Cluster of Excellence COTE (Continental To coastal Ecosystems: evolution, adaptability and governance) (ANR-10-LABX-45). E.V.C. was funded by the BiodivERsA (BiodivERsA is a network of national and regional funding organisations promoting pan-European research on biodiversity and ecosystem services, and offering innovative opportunities for the conservation and sustainable management of biodiversity) project SPONFOREST (Unraveling the potential of spontaneous forest establishment for improving ecosystem functions and services in dynamic landscapes) (BiodivERsA3-2015-58). info:eu-repo/semantics/publishedVersion
- Published
- 2021
- Full Text
- View/download PDF
4. Climate variability and drought modulate the role of structural refuges for arthropods: a global experiment
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Mirela Sertić Perić, Heloise Gibb, Gustavo Q. Romero, Anna Mrazova, Jana S. Petermann, Victoria Kemp, Michal Knapp, Jacob Cristóbal-Pérez, María Laura Bernaschini, Thiago Gonçalves-Souza, Robert J. Marquis, Tatiana Cornelissen, Tiit Teder, Pierre Rogy, M. Kurtis Trzcinski, Nicholas A. C. Marino, Jérôme Orivel, Reuber Antoniazzi, Annika Busse, Vojtech Novotny, Fabiola Ospina, Mari-Liis Viljur, Pavel Kratina, Gustavo Aires, Camila Vieira, Wesley Dáttilo, Ezequiel González, Robin Maritz, Shen Sui, Scarlett Szpryngiel, Diane S. Srivastava, Martin Videla, Cássio Pereira, Natalie Westwood, Crasso Paulo Bosco Breviglieri, Mônica F. Kersch-Becker, Julia Koricheva, Sérvio Pontes Ribeiro, Paulo Martins, Rebecca Luke, Mariana Jausoro, Stanis Kaensin, Stefan Majnarić, Katerina Sam, Tomáš Kadlec, Valentina Carvajal, Samuel Novais, Ayco J. M. Tack, Esayas Mendesil, Mauricio Quesada, Tomas Roslin, Thiago J. Izzo, and Jaroslav Michalko
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Biomass (ecology) ,Herbivore ,Ecology ,Abundance (ecology) ,Biodiversity ,Climate change ,Biology ,climate warming ,arthropods ,ecosystem engineers ,Predator ,Predation ,Latitude - Abstract
Current climate change is disrupting biotic interactions and eroding biodiversity worldwide. However, species sensitive to drought, high temperatures and climate variability might persist in microclimatic refuges, such as leaf shelters built by arthropods. We conducted a distributed experiment across an 11,790 km latitudinal gradient to explore how the importance of leaf shelters for terrestrial arthropods changes with latitude, elevation and underlying climate. Our analyses revealed leaf shelters to be key facilitative elements for the diversity of arthropods. Predator diversity and overall biomass within shelters increased with local drought and temperature variability, regardless of latitude and elevation. In contrast, shelter usage by herbivores increased with abundance of predators on those same plants and in wetter climates. Projected increase in climatic variability and drought in certain geographic regions is therefore likely to enhance the importance of biotic refuges, especially for predators, in mitigating the impact of climate change on species persistence.
- Published
- 2021
5. Application of methyl jasmonate to grey willow (Salix cinerea) attracts insectivorous birds in nature
- Author
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Katerina Sam and Anna Mrazova
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0106 biological sciences ,Salix cinerea ,Willow ,Herbivore ,Methyl jasmonate ,Ecology ,biology ,Jasmonic acid ,biology.organism_classification ,010603 evolutionary biology ,01 natural sciences ,Attraction ,Predation ,law.invention ,010602 entomology ,chemistry.chemical_compound ,chemistry ,law ,Insect Science ,Botany ,Plasticine ,Agronomy and Crop Science ,Ecology, Evolution, Behavior and Systematics - Abstract
It has been suggested that insectivorous birds may be guided by herbivore-induced plant volatiles (HIPVs) to herbivore-rich trees with herbivorous damage. The HIPV production in plants is partly mediated by jasmonic acid signalling pathway. Methyl jasmonate (MeJA) was proved to be a suitable agent for induction of HIPVs similar to those induced by herbivorous insects in many plant species. We studied the effects of methyl jasmonate on volatile emission and natural enemy attraction using mature grey willow (Salix cinerea) under natural conditions in Czech Republic. We treated 12 experimental shrubs with 30 mM MeJA and completed the experiment with 12 control shrubs. We monitored attacks by natural predators with artificial plasticine caterpillars which were checked daily. Birds most often pecked the caterpillars exposed on MeJA-treated shrubs and this attractiveness differed significantly from control. Attractiveness of MeJA-treated shrubs did not differ significantly from control shrubs for arthropod predators. Spraying MeJA on grey willows resulted in significantly higher production of α-pinene, β-pinene, 3-carene, limonene and β-ocimene. There was a marginally significant positive correlation between the predation rate by birds and relative change in α-pinene emissions.
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- 2017
- Full Text
- View/download PDF
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