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Search for top‐down and bottom‐up drivers of latitudinal trends in insect herbivory in oak trees in Europe

Elena Valdés‐correcher 1, * Xoaquín Moreira 2 Laurent Augusto 3 Luc L. Barbaro 4 Christophe Bouget 5 Olivier Bouriaud 6 Manuela Branco 7 Giada Centenaro 8 Gyorgy Csoka 9 Thomas Damestoy 1 Jovan Dobrosavljević 10 Mihai‐leonard Duduman 11 Anne‐maïmiti Dulaurent 12 Csaba Eötvös 9 Maria Faticov 13 Marco Ferrante 14, 15 Ágnes Fürjes‐mikó 9 Andrea Galmán Martin Gossner 16 Arndt Hampe 1 Deborah Harvey 17 Andrew Gordon Howe 18 Yasmine Kadiri 1 Michèle Kaennel‐dobbertin Julia Koricheva Alexander Kozel Mikhail Kozlov Gábor Lövei Daniela Lupaștean Slobodan Milanović Anna Mrazova Lars Opgennoorth Juha‐matti Pitkänen Anna Popova Marija Popović Andreas Prinzing 19 Valentin Queloz Tomas Roslin Aurélien Sallé Katerina Sam Michael Scherer‐lorenzen Andreas Schuldt 20 Andrey Selikhovkin 21 Lassi Suominen Ayco Tack 13 Marketa Tahadlova 22, 23 Rebecca Thomas 17 Bastien Castagneyrol 1, * 
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.
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Contributor : Christelle Raynaud Connect in order to contact the contributor
Submitted on : Wednesday, May 25, 2022 - 3:31:26 PM
Last modification on : Friday, August 5, 2022 - 12:40:03 PM



Elena Valdés‐correcher, Xoaquín Moreira, Laurent Augusto, Luc L. Barbaro, Christophe Bouget, et al.. Search for top‐down and bottom‐up drivers of latitudinal trends in insect herbivory in oak trees in Europe. Global Ecology and Biogeography, Wiley, 2021, 30 (3), pp.651-665. ⟨10.1111/geb.13244⟩. ⟨hal-03103928⟩



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