"Trophic overyielding": phytoplankton diversity promotes zooplankton productivity.

Abstract : Diversity-productivity relationships at the primary producer level have been extensively studied, especially for terrestrial systems. Here, we explore whether the diversity of aquatic primary producers (phytoplankton) has effects on higher trophic levels (zooplankton). We investigated the effect of phytoplankton diversity on an artificial zooplankton community in a laboratory experiment where phytoplankton biomass and elemental composition (carbon-to-phosphorus ratio) were kept constant. Phytoplankton diversity increased the means of both zooplankton growth rate and abundance while suppressing their variability, and sustained higher zooplankton diversity. Likely explanations include resource complementarity effects among phytoplankton species as food entities, as well as niche complementarity effects among Daphnia species as competitors. By affecting the productivity as well as the variability of the next trophic level, biodiversity of primary producers may have far-reaching consequences in aquatic food webs.
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Article dans une revue
Ecology, Ecological Society of America, 2012, 93 (12), pp.2719-27
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http://hal.univ-brest.fr/hal-00817077
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Soumis le : mardi 23 avril 2013 - 16:47:44
Dernière modification le : mercredi 29 novembre 2017 - 09:58:33

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  • HAL Id : hal-00817077, version 1
  • PUBMED : 23431601

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Maren Striebel, Gabriel Singer, Herwig Stibor, Tom Andersen. "Trophic overyielding": phytoplankton diversity promotes zooplankton productivity.. Ecology, Ecological Society of America, 2012, 93 (12), pp.2719-27. 〈hal-00817077〉

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