Abstract:
:Although studies on biodiversity and ecosystem function are often framed within the context of anthropogenic change, a central question that remains is how important are direct vs. indirect (via changes in biodiversity) effects of anthropogenic stressors on ecosystem functions in multitrophic-level communities. Here, we quantify the effects of the fungicide chlorothalonil on 34 species-, 2 community- and 11 ecosystem-level responses in a multitrophic-level system. At ecologically relevant concentrations, chlorothalonil increased mortality of amphibians, gastropods, zooplankton, algae and a macrophyte (reducing taxonomic richness), reduced decomposition and water clarity and elevated dissolved oxygen and net primary productivity. These ecosystem effects were indirect and predictable based on changes in taxonomic richness. A path analysis suggests that chlorothalonil-induced reductions in biodiversity and top-down and bottom-up effects facilitated algal blooms that shifted ecosystem functions. This work emphasises the need to re-evaluate the safety of chlorothalonil and to further link anthropogenic-induced changes in biodiversity to altered ecosystem functions.
journal_name
Ecol Lettjournal_title
Ecology lettersauthors
McMahon TA,Halstead NT,Johnson S,Raffel TR,Romansic JM,Crumrine PW,Rohr JRdoi
10.1111/j.1461-0248.2012.01790.xsubject
Has Abstractpub_date
2012-07-01 00:00:00pages
714-22issue
7eissn
1461-023Xissn
1461-0248journal_volume
15pub_type
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