Trophic cascade induced by molluscivore predator alters pore-water biogeochemistry via competitive release of prey
| Autor: | Laura L. Govers, Erik J. Jansen, Jimmy de Fouw, Theunis Piersma, Jan A. van Gils, Matthijs van der Geest |
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| Přispěvatelé: | Olff group, Piersma group |
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
hydrogen sulfide
Predation COEXISTENCE Dosinia Feces Dosinia isocardia Bivalves (Dosinia isocardia loripes lucinalis) HABITAT Top-down effect Loripes lucinalis) media_common biology Hydrogen sulfide Ecology Molecular Animal Physiology Mauritania Adaptation Physiological ECOLOGICAL CONSEQUENCES Food web Predator-exclosure experiment Red Knot Interspecific competition Calidris canutus canutus growth rate predation Facilitation DEPLETION Food Chain BIVALVIA media_common.quotation_subject predator-exclosure experiment Sulfides Models Biological Competition (biology) facilitation DIET FOOD WEBS Birds bivalves (Dosinia isocardia Loripes lucinalis) Banc d'Arguin mauritania SULFIDE Animals Ecosystem Red Knot Calidris canutus canutus Trophic cascade bivalves (Dosinia isocardia Ecology Evolution Behavior and Systematics Detritus Banc d'Arguin Mauritania Growth rate interspecific competition toxicity Water Seagrass beds seagrass beds biology.organism_classification top-down effect Bivalvia KNOTS CALIDRIS-CANUTUS Banc d'Arguin Mollusca Predatory Behavior Loripes lucinalis COMMUNITIES Environmental Sciences |
| Zdroj: | Ecology 93 (2012) 5 Ecology, 93, 1143-1152 Ecology, 93(5), 1143-1152. Wiley-Blackwell Ecology, 93, 5, pp. 1143-1152 ResearcherID Ecology, 93(5), 1143-1152 |
| ISSN: | 0012-9658 |
| Popis: | Effects of predation may cascade down the food web. By alleviating interspecific competition among prey, predators may promote biodiversity, but the precise mechanisms of how predators alter competition have remained elusive. Here we report on a predator-exclosure experiment carried out in a tropical intertidal ecosystem, providing evidence for a three-level trophic cascade induced by predation by molluscivore Red Knots (Calidris canutus) that affects pore water biogeochemistry. In the exclosures the knots' favorite prey (Dosinia isocardia) became dominant and reduced the individual growth rate in an alternative prey (Loripes lucinalis). Dosinia, a suspension feeder, consumes suspended particulate organic matter (POM), whereas Loripes is a facultative mixotroph, partly living on metabolites produced by sulfur-oxidizing chemoautotrophic bacteria, but also consuming suspended POM. Reduced sulfide concentrations in the exclosures suggest that, without predation on Dosinia, stronger competition for suspended POM forces Loripes to rely on energy produced by endosymbiotic bacteria, thus leading to an enhanced uptake of sulfide from the surrounding pore water. As sulfide is toxic to most organisms, this competition-induced diet shift by Loripes may detoxify the environment, which in turn may facilitate other species. The inference that predators affect the toxicity of their environment via a multi-level trophic cascade is novel, but we believe it may be a general phenomenon in detritus-based ecosystems. |
| Databáze: | OpenAIRE |
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