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Funct Ecol

Title:		Climate affects neighbour-induced changes in leaf chemical defences and tree diversity-herbivory relationships
Author(s):		Poeydebat C; Jactel H; Moreira X; Koricheva J; Barsoum N; Bauhus J; Eisenhauer N; Ferlian O; Francisco M; Gottschall F; Gravel D; Mason B; Muiruri E; Muys B; Nock C; Paquette A; Ponette Q; Scherer-Lorenzen M; Stokes V; Staab M; Verheyen K; Castagneyrol B;
Address:		"INRAE, UMR 1202 BIOGECO, Cestas, France. Universite de Bordeaux, BIOGECO, UMR 1202, Talence, France. Mision Biologica de Galicia (MBG-CSIC), Pontevedra, Spain. Department of Biological Sciences, Royal Holloway University of London, Egham, UK. Forest Research, Alice Holt Lodge, Farnham, UK. Chair of Silviculture, University of Freiburg, Freiburg, Germany. German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany. Institute of Biology, Leipzig University, Leipzig, Germany. Departement de Biologie, Universite de Sherbrooke, Sherbrooke, QC, Canada. Forest Research, Northern Research Station, Roslin Midlothian, UK. Division of Forest, Nature and Landscape, Department of Earth and Environmental Sciences, KU Leuven, Leuven, Belgium. Department of Renewable Resources, University of Alberta, Edmonton, AB, Canada. Faculty of Biology, Department of Geobotany, University of Freiburg, Freiburg, Germany. Centre for Forest Research, Universite du Quebec a Montreal, Montreal, QC, Canada. Faculty of Bioscience Engineering & Earth and Life Institute, Universite Catholique de Louvain, Louvain-la-Neuve, Belgium. Nature Conservation and Landscape Ecology, Faculty of Environment and Natural Resources, University of Freiburg, Freiburg, Germany. Forest & Nature Lab, Department of Environment, Ghent University, Melle-Gontrode, Belgium"
Journal Title:		Funct Ecol
Year:		2021
Volume:		20201014
Issue:		1
Page Number:		67 - 81
DOI:		10.1111/1365-2435.13700
ISSN/ISBN:		0269-8463 (Print) 1365-2435 (Electronic) 0269-8463 (Linking)
Abstract:		"Associational resistance theory predicts that insect herbivory decreases with increasing tree diversity in forest ecosystems. However, the generality of this effect and its underlying mechanisms are still debated, particularly since evidence has accumulated that climate may influence the direction and strength of the relationship between diversity and herbivory.We quantified insect leaf herbivory and leaf chemical defences (phenolic compounds) of silver birch Betula pendula in pure and mixed plots with different tree species composition across 12 tree diversity experiments in different climates. We investigated whether the effects of neighbouring tree species diversity on insect herbivory in birch, that is, associational effects, were dependent on the climatic context, and whether neighbour-induced changes in birch chemical defences were involved in associational resistance to insect herbivory.We showed that herbivory on birch decreased with tree species richness (i.e. associational resistance) in colder environments but that this relationship faded as mean annual temperature increased.Birch leaf chemical defences increased with tree species richness but decreased with the phylogenetic distinctiveness of birch from its neighbours, particularly in warmer and more humid environments.Herbivory was negatively correlated with leaf chemical defences, particularly when birch was associated with closely related species. The interactive effect of tree diversity and climate on herbivory was partially mediated by changes in leaf chemical defences.Our findings confirm that tree species diversity can modify the leaf chemistry of a focal species, hence its quality for herbivores. They further stress that such neighbour-induced changes are dependent on climate and that tree diversity effects on insect herbivory are partially mediated by these neighbour-induced changes in chemical defences"
Keywords:		Betula pendula TreeDivNet associational resistance biodiversity leaf phenolics mixed forests phylogenetic diversity plant-insect interactions;
Notes:		"PubMed-not-MEDLINEPoeydebat, Charlotte Jactel, Herve Moreira, Xoaquin Koricheva, Julia Barsoum, Nadia Bauhus, Jurgen Eisenhauer, Nico Ferlian, Olga Francisco, Marta Gottschall, Felix Gravel, Dominique Mason, Bill Muiruri, Evalyne Muys, Bart Nock, Charles Paquette, Alain Ponette, Quentin Scherer-Lorenzen, Michael Stokes, Victoria Staab, Michael Verheyen, Kris Castagneyrol, Bastien eng 677232/ERC_/European Research Council/International England 2021/03/23 Funct Ecol. 2021 Jan; 35(1):67-81. doi: 10.1111/1365-2435.13700. Epub 2020 Oct 14"