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dc.contributor.authorFall, Johanna Jennifer Elisabeth
dc.contributor.authorFiksen, Øyvind
dc.date.accessioned2020-01-10T09:06:24Z
dc.date.available2020-01-10T09:06:24Z
dc.date.created2019-12-12T13:21:52Z
dc.date.issued2019
dc.identifier.citationFish and Fisheries. 2019, 1-17.nb_NO
dc.identifier.issn1467-2960
dc.identifier.urihttp://hdl.handle.net/11250/2635618
dc.description.abstractPredatory fish structure communities through prey pursuit and consumption and, in many marine systems, the gadoids are particularly important. These predators have flexible feeding behaviours and often feed on large prey items. Digestion times of large prey are usually longer than handling times, and gut processing limits feeding rate at high prey density. Optimizing the gut content mix can therefore be an important behavioural strategy. Here, we develop a foraging model that incorporates gut processing and use the model to disentangle internal and external limitations on feeding in the omnivorous cod (Gadus morhua, Gadidae). We extend the traditional definition of prey profitability to consider prey digestive quality, which we quantify for prey of Northeast Atlantic cod populations. We find an important role for gut limitation; within a range of ecologically relevant temperatures and prey densities, predicted feeding rates were strongly reduced compared to feeding constrained by external factors only, and the optimal diet composition under gut limitation differed from predictions from traditional foraging theory. Capelin, a main prey of Northeast Arctic cod, had the highest digestive quality of all prey across ecosystems, but the cold temperatures in the Barents Sea strongly limited feeding rate by slowing down digestion. Baltic cod fed on a higher proportion of poor‐quality prey compared to the other populations, contributing to its slow growth in relation to water temperature. Gut limitation is particularly important to consider in foraging models for fish with many alternative prey species or fish occupying cold waters where digestion is slow.nb_NO
dc.language.isoengnb_NO
dc.titleNo room for dessert: A mechanistic model of prey selection in gut-limited predatory fishnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionpublishedVersionnb_NO
dc.source.pagenumber1-17nb_NO
dc.source.journalFish and Fisheriesnb_NO
dc.identifier.doi10.1111/faf.12415
dc.identifier.cristin1760038
dc.relation.projectNorges forskningsråd: 255460nb_NO
dc.relation.projectNorges forskningsråd: 243676nb_NO
cristin.unitcode7431,11,0,0
cristin.unitnameBunnfisk
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2


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