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Predator−prey body size relationships of cod in a low-diversity marine system
Stockholm University, Faculty of Science, Stockholm Resilience Centre.
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2019 (English)In: Marine Ecology Progress Series, ISSN 0171-8630, E-ISSN 1616-1599, Vol. 627, p. 201-206Article in journal (Refereed) Published
Abstract [en]

How predators select their prey largely defines ecosystem trophic structure, function and dynamics. In aquatic systems, organism body size is an important trait explaining predator− prey interactions. Here, we used a unique Atlantic cod Gadus morhua stomach content dataset with diet information from over 100 000 individuals collected from the Baltic Sea in 1963−2014, to explore prey size distribution and predator−prey mass ratios in the diet of Eastern Baltic cod. Maximum and average prey sizes increased with predator size, as for cod in other systems. However, the prey size spectra found in Eastern Baltic cod stomachs reflect the low species diversity in the Baltic Sea. In general, Eastern Baltic cod feed on smaller prey in relation to their body size than other cod populations. Due to the truncated prey size distribution in the Baltic Sea, cod cannibalism functions as a compensatory mechanism that allows Baltic cod to reach their prey size potential. On the other hand, small- and intermediate-sized cod prey mainly on a few invertebrate prey species, potentially making them vulnerable to changes in these prey populations. Our results encourage further studies disentangling the relative effects of prey preference and prey availability on cod trophodynamics in species-poor systems such as the Baltic Sea. 

Place, publisher, year, edition, pages
2019. Vol. 627, p. 201-206
Keywords [en]
Diet, Body size, Predator-prey mass ratio, Gadus morhua, Baltic Sea, Stomach content data
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:su:diva-178215DOI: 10.3354/meps13098Scopus ID: 2-s2.0-85072721953OAI: oai:DiVA.org:su-178215DiVA, id: diva2:1387183
Available from: 2020-01-20 Created: 2020-01-20 Last updated: 2020-01-21Bibliographically approved

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