Omnivory and grazer functional composition moderate cascading trophic effects in experimental Fucus vesiculosus habitats
| Autor: | Britas Klemens Eriksson, Sonja Råberg, Christiaan van Sluis, Katrin Sieben, Lena Kautsky |
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| Přispěvatelé: | Eriksson group |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Original Paper
COMPLEXITY Ecology DIVERSITY Fucus vesiculosus Aquatic Science Biology biology.organism_classification Food web ECOLOGICAL CONSEQUENCES COMMUNITY COMPOSITION RESOURCE CONTROL Shrimp Predation BIOMASS FOOD WEBS ECOSYSTEM Ecosystem BIODIVERSITY Omnivore TOP-DOWN CONTROL Trophic cascade Ecology Evolution Behavior and Systematics Trophic level |
| Zdroj: | Marine Biology Marine Biology, 158(4), 747-756. SPRINGER HEIDELBERG |
| ISSN: | 0025-3162 |
| DOI: | 10.1007/s00227-010-1602-6 |
| Popis: | We tested the relative strength of direct versus indirect effects of an aquatic omnivore depending on the functional composition of grazers by manipulating the presence of gastropod and amphipod grazers and omnivorous shrimp in outdoor mesocosms. By selectively preying upon amphipods and reducing their abundance by 70–80%, omnivorous shrimp favoured the dominance of gastropods. While gastropods were the main microalgal grazers, amphipods controlled macroalgal biomass in the experiment. However, strong predation on the amphipod by the shrimp had no significant indirect effects on macroalgal biomass, indicating that when amphipod abundances declined, complementary feeding by the omnivore on macroalgae may have suppressed a trophic cascade. Accordingly, in the absence of amphipods, the shrimp grazed significantly on green algae and thereby suppressed the diversity of the macroalgal community. Our experiment demonstrates direct consumer effects by an omnivore on both the grazer and producer trophic levels in an aquatic food web, regulated by prey availability. Electronic supplementary material The online version of this article (doi:10.1007/s00227-010-1602-6) contains supplementary material, which is available to authorized users. |
| Databáze: | OpenAIRE |
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