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Article Dans Une Revue Global Ecology and Biogeography Année : 2021

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

Xoaquín Moreira
Laurent Augusto
Christophe Bouget
Olivier Bouriaud
Thomas Damestoy
Maria Faticov
Andrea Galmán
Martin Gossner
Arndt Hampe
Michèle Kaennel‐dobbertin
  • Fonction : Auteur
Julia Koricheva
  • Fonction : Auteur
Alexander Kozel
  • Fonction : Auteur
Mikhail Kozlov
  • Fonction : Auteur
Gábor Lövei
  • Fonction : Auteur
Daniela Lupaștean
  • Fonction : Auteur
Slobodan Milanović
  • Fonction : Auteur
Anna Mrazova
  • Fonction : Auteur
Lars Opgennoorth
  • Fonction : Auteur
Juha‐matti Pitkänen
  • Fonction : Auteur
Anna Popova
  • Fonction : Auteur
Marija Popović
  • Fonction : Auteur
Valentin Queloz
  • Fonction : Auteur
Tomas Roslin
  • Fonction : Auteur
Aurélien Sallé
  • Fonction : Auteur
Katerina Sam
  • Fonction : Auteur
Michael Scherer‐lorenzen
  • Fonction : Auteur
Lassi Suominen
  • Fonction : Auteur
Ayco Tack

Résumé

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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Dates et versions

hal-03103928 , version 1 (25-05-2022)

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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, 2021, 30 (3), pp.651-665. ⟨10.1111/geb.13244⟩. ⟨hal-03103928⟩
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