J Plant Ecol ›› 2017, Vol. 10 ›› Issue (1): 13-27.doi: 10.1093/jpe/rtw038

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Tree diversity increases levels of herbivore damage in a subtropical forest canopy: evidence for dietary mixing by arthropods?

Matteo Brezzi1,*, Bernhard Schmid1, Pascal A. Niklaus1 and Andreas Schuldt2   

  1. 1 Department of Evolutionary Biology and Environmental Studies and Zürich-Basel Plant Science Center, University of Zürich, Winterthurerstr. 190, CH-8057 Zürich, Switzerland; 2 Institute of Ecology, Animal Ecology Group, Leuphana University Lueneburg, Scharnhorststr. 1, D-21335 Lünebourg, Germany
  • Received:2015-08-23 Accepted:2016-04-25 Online:2017-01-30 Published:2017-02-04
  • Contact: Brezzi, Matteo E-mail:matteo.brezzi@ieu.uzh.ch

Abstract: Aims Plant diversity has been linked to both increasing and decreasing levels of arthropod herbivore damage in different plant communities. So far, these links have mainly been studied in grasslands or in artificial tree plantations with low species richness. Furthermore, most studies provide results from newly established experimental plant communities where trophic links are not fully established or from stands of tree saplings that have not yet developed a canopy. Here, we test how tree diversity in a species-rich subtropical forest in China with fully developed tree canopy affects levels of herbivore damage caused by different arthropod feeding guilds.
Methods We established 27 plots of 30×30 m area. The plots were selected randomly but with the constraint that they had to span a large range of tree diversity as required for comparative studies in contrast to sample surveys. We recorded herbivore damage caused by arthropod feeding guilds (leaf chewers, leaf skeletonizers and sap feeders) on canopy leaves of all major tree species.
Important findings Levels of herbivore damage increased with tree species richness and tree phylogenetic diversity. These effects were most pronounced for damage caused by leaf chewers. Although the two diversity measures were highly correlated, we additionally found a significant interaction between them, whereby species richness increased herbivory mostly at low levels of phylogenetic diversity. Tree species with the lowest proportion of canopy leaf biomass in a plot tended to suffer the highest levels of herbivore damage, which is in contrast to expectations based on the resource concentration hypothesis. Our results are in agreement with expectations of the dietary mixing hypothesis where generalist herbivores with a broad spectrum of food plants benefit from increased resource diversity in tree species-rich forest patches.

Key words: arthropod herbivore damage, feeding guilds, forest canopy, generalist herbivores, leaf biomass, resource dilution, specialist herbivores, tree species richness, tree phylogenetic diversity

摘要:
Aims Plant diversity has been linked to both increasing and decreasing levels of arthropod herbivore damage in different plant communities. So far, these links have mainly been studied in grasslands or in artificial tree plantations with low species richness. Furthermore, most studies provide results from newly established experimental plant communities where trophic links are not fully established or from stands of tree saplings that have not yet developed a canopy. Here, we test how tree diversity in a species-rich subtropical forest in China with fully developed tree canopy affects levels of herbivore damage caused by different arthropod feeding guilds.
Methods We established 27 plots of 30×30 m area. The plots were selected randomly but with the constraint that they had to span a large range of tree diversity as required for comparative studies in contrast to sample surveys. We recorded herbivore damage caused by arthropod feeding guilds (leaf chewers, leaf skeletonizers and sap feeders) on canopy leaves of all major tree species.
Important findings Levels of herbivore damage increased with tree species richness and tree phylogenetic diversity. These effects were most pronounced for damage caused by leaf chewers. Although the two diversity measures were highly correlated, we additionally found a significant interaction between them, whereby species richness increased herbivory mostly at low levels of phylogenetic diversity. Tree species with the lowest proportion of canopy leaf biomass in a plot tended to suffer the highest levels of herbivore damage, which is in contrast to expectations based on the resource concentration hypothesis. Our results are in agreement with expectations of the dietary mixing hypothesis where generalist herbivores with a broad spectrum of food plants benefit from increased resource diversity in tree species-rich forest patches.

[1] Hong Qian, Tao Deng and Hang Sun. Global and regional tree species diversity [J]. J Plant Ecol, 2019, 12(2): 210-215.
[2] Nalini M. Nadkarni and Kevin D. Kohl. Elements of disturbance that affect epiphyte vitality in a temperate rainforest: an experimental approach [J]. J Plant Ecol, 2019, 12(2): 306-313.
[3] Hong Qian, Jong-Suk Song. Latitudinal gradients of associations between beta and gamma diversity of trees in forest communities in the New World [J]. J Plant Ecol, 2013, 6(1): 12-18.
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