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New Paper: Ebeling et al. 2017. Plant diversity induces shifts in the functional structure and diversity across trophic levels



Abstract:

Changes to primary producer diversity can cascade up to consumers and aff ect ecosystem processes. Although the eff ect of producer diversity on higher trophic groups have been studied, these studies often quantify taxonomy-based measures of biodiversity, like species richness, which do not necessarily refl ect the functioning of these communities. In this study, we assess how plant species richness aff ects the functional composition and diversity of higher trophic levels and discuss how this might aff ect ecosystem processes, such as herbivory, predation and decomposition. Based on six diff erent consumer traits, we examined the functional composition of arthropod communities sampled in experimental plots that diff ered in plant species richness. Th e two components we focused on were functional variation in the consumer community structure (functional structure) and functional diversity, expressed as functional richness, evenness and divergence. We found a consistent positive eff ect of plant species richness on the functional richness of herbivores, carnivores, and omnivores, but not decomposers, and contrasting patterns for functional evenness and divergence. Increasing plant species richness shifted the omnivore community to more predatory and less mobile species, and the herbivore community to more specialized and smaller species. Th is was accompanied by a shift towards more species occurring in the vegetation than in the ground layer. Our study shows that plant species richness strongly aff ects the functional structure and diversity of aboveground arthropod communities. Th e observed shifts in body size (herbivores), specialization (herbivores), and feeding mode (omnivores) together with changes in the functional diversity may underlie previously observed increases in herbivory and predation in plant communities of higher diversity.

Citation:

Ebeling, A., Rzanny, M., Lange, M., Eisenhauer, N., Hertzog, L. R., Meyer, S. T. and Weisser, W. W. (2017), Plant diversity induces shifts in the functional structure and diversity across trophic levels. Oikos. doi:10.1111/oik.04210

Contact:

Anne Ebeling  

Meldung vom: 28.09.2017 20:08 Uhr
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