Functional diversity and trait composition of butterfly and bird communities in Farmlands of Central Romania

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Cultural landscapes all over the world harbor species communities that are taxonomically and functionally diverse. In Eastern Europe, but also in many other regions of the world, the conservation of this farmland biodiversity is threatened by land use intensification and abandonment. In order to counteract the negative effects of land use change in such landscapes, a thorough understanding of the functional relationships between species and their environment is crucial. In this study, we investigated the relationship of functional traits of butterfly and bird communities and environmental conditions in 120 sites in traditional farmlands of southern Transylvania, Romania. First, we compared taxonomic diversity (i.e., Shannon diversity) with functional diversity (i.e., functional dispersion), and second, we linked species traits to environmental variables by performing RLQ analyses. Functional traits indicating reproduction, movement, and feeding behavior related with environmental variables describing heterogeneity, amount of woody vegetation, and topography at three different spatial scales. We found positive relationships between taxonomic and functional diversity, as well as strong linkages between species traits and environmental conditions for both groups. Specifically, butterfly composition was most strongly influenced by land use type and life‐history strategies. Bird composition was most strongly related to the amount of woody vegetation and nesting and foraging strategies. We conclude that maintaining the typical features of traditional farming landscapes, especially a small‐scale heterogeneity in arable land and gradients of woody vegetation cover, would be desirable in order to sustain a high functional diversity in southern Transylvania in the future.

Original languageEnglish
JournalEcosystem Health and Sustainability
Volume1
Issue number10
Pages (from-to)1-8
Number of pages8
ISSN2096-4129
DOIs
Publication statusPublished - 01.12.2015

Bibliographical note

We are grateful to our field assistants Monica Beldean, Rémi Bigonneau, Anne-Catherine Klein, Lunja Marlie Ernst, Josef Pal Frink, Laurie Jackson, Paul Kirkland, Kimberley Pope, Jörg Steiner, Laura Sutcliffe, Elek Telek, and Pavel Dan Turtureanu for help with the field surveys. We thank Stéphane Dray for advice on the analysis and Joern Fischer for general support throughout the project. This research was funded through a Sofja-Kovalevskaja Award to Joern Fischer, granted by the Alexander von Humboldt Foundation and sponsored by the German Ministry of Research and Education.

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