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Long-term variation of link strength in a simple benthic food web.
Umeå University, Faculty of Science and Technology, Ecology and Environmental Science.
Umeå University, Faculty of Science and Technology, Ecology and Environmental Science.
Umeå University, Faculty of Science and Technology, Ecology and Environmental Science.
2008 (English)In: Journal of Animal Ecology, ISSN 1365-2656, Vol. 77, no 5, 883-90 p.Article in journal (Refereed) Published
Abstract [en]

1. The predatory isopod Saduria entomon (L.) and its amphipod prey Monoporeia affinis (Lindström) are key components of the food web in the northern Baltic Sea, together representing 80-90% of the macrobenthic biomass. We use 20 years of stomach content data for Saduria to investigate how diet dynamics affect the stability of the interaction between Saduria and Monoporeia.

2. Consumption of the main prey, Monoporeia, fitted a type III functional response. Consumption rates of the most important alternative prey, mysids, were found to be unrelated to mysid densities but negatively related to the density of Monoporeia. The fit of consumption data to a model that assumes passive prey selection was poor. Thus we conclude that some form of active choice is involved.

3. The effect of consumption of mysids, the alternative prey, on the stability of this system was investigated using a ‘one predator-two prey' model with stochastic environmental variation. Analysis of the model suggests that feeding on mysids leads to a decreased extinction risk for the predator, Saduria, and reduced density oscillations for both Saduria and its main prey, Monoporeia

Place, publisher, year, edition, pages
2008. Vol. 77, no 5, 883-90 p.
Identifiers
URN: urn:nbn:se:umu:diva-11423DOI: doi:10.1111/j.1365-2656.2008.01404.xPubMedID: 18507696OAI: oai:DiVA.org:umu-11423DiVA: diva2:151094
Available from: 2009-01-08 Created: 2009-01-08 Last updated: 2011-01-10Bibliographically approved

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Englund, GöranLeonardsson, Kjell

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CiteExportLink to record
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Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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  • de-DE
  • en-GB
  • en-US
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  • nn-NO
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Output format
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