Ecosystem consequences of species richness and composition in pond food webs

@article{Downing2002EcosystemCO,
  title={Ecosystem consequences of species richness and composition in pond food webs},
  author={Amy L Downing and Mathew A. Leibold},
  journal={Nature},
  year={2002},
  volume={416},
  pages={837-841}
}
Resolving current concerns about the role of biodiversity on ecosystems calls for understanding the separate roles of changes in species numbers and of composition. Recent work shows that primary productivity often, but not always, saturates with species richness within single trophic levels. However, any interpretation of such patterns must consider that variation in biodiversity is necessarily associated with changes in species composition (identity), and that changes in biodiversity often… 
RELATIVE EFFECTS OF SPECIES COMPOSITION AND RICHNESS ON ECOSYSTEM PROPERTIES IN PONDS
TLDR
Comparisons of the relative effects of species composition, species richness, functional group richness, and functional group composition across pond food webs suggest that the roles of species in ecosystems, when considered in a food web context, are often the result of both direct and indirect effects that are difficult to predict.
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This study links the biodiversity ecosystem function paradigm with food web concepts to improve predictions for conservation and management actions in response to changes in biodiversity.
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TLDR
It was found that fish species richness and assemblage composition were important predictors of PPR in stream mesocosms, and the effect of species richness on PPR increased with time, suggesting that richness-related effects might strengthen as the magnitude of community-level interactions increases in ecosystems.
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TLDR
It is suggested that trophic skewing of species richness and overall changes in food web topology can influence marine community structure and food web dynamics in complex ways, emphasizing the need for multitrophic approaches to understand the consequences of marine extinctions and invasions.
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TLDR
The results provide further evidence that species traits, rather than richness per se, influence ecosystem function most, particularly in detrital-based food webs with high functional redundancy across species, and suggest that loss of large-bodied consumer species could disproportionally impact ecosystem function.
Food-web constraints on biodiversity–ecosystem functioning relationships
  • É. ThébaultM. Loreau
  • Environmental Science
    Proceedings of the National Academy of Sciences of the United States of America
  • 2003
TLDR
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Species richness–variability relationships in multi‐trophic aquatic microcosms
TLDR
The results suggest that species loss may affect population and community variability differently in multi-trophic versus single trophic level communities, and if this is so, then the mechanisms proposed to underlie the effects of S on community variability in single-Trophic communities may have to be supplemented by those that describe contributions to population stability in order to fully describe the patterns observed in multi -trophic communities.
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