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Diet specialization in a fluctuating population of Saduria entomon: a consequence of resource or forager densities?
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. (Arcum)
2011 (English)In: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 120, no 6, 848-854 p.Article in journal (Refereed) Published
Abstract [en]

Intraspecific competition has been shown to favor diet specialization among individuals. However, the question whether the competition takes the form of interference or exploitative in driving diet specialization has never been investigated. We investigated individual diet specialization in the isopod Saduria entomon, in relation to forager and resource biomasses in a system that exhibits predator–prey fluctuations in density. We found that individual diet specialization was only affected by the biomass of their preferred prey (Monoporeia affinis) and not by Saduria biomass; diet specialization was higher when Monoporeia biomass was low compared to when there were high Monoporeia biomass. Population diet breadth increased at low Monoporeia biomass whereas individual diet breadths were marginally affected by Monoporeia biomass. Overall, this led to the increase in diet specialization at low Monoporeia biomass. This study shows that predator–prey dynamics might influence diet specialization in the predator and that resource biomass, not forager biomass might be important for individual diet specialization.

Place, publisher, year, edition, pages
2011. Vol. 120, no 6, 848-854 p.
Keyword [en]
disruptive selection; ecological specialization; individual specialization; sympatric speciation; natural-populations; functional-response; alternative prey; niche width; sea otters; competition
National Category
Environmental Sciences
URN: urn:nbn:se:umu:diva-40975DOI: 10.1111/j.1600-0706.2010.18945.xOAI: diva2:404006
Available from: 2011-03-15 Created: 2011-03-15 Last updated: 2016-05-19Bibliographically approved

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Rydberg, CeciliaEnglund, Göran
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