No room for dessert: A mechanistic model of prey selection in gut-limited predatory fish
Predatory 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, an...
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Format: | Article in Journal/Newspaper |
Language: | English |
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2019
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Online Access: | http://hdl.handle.net/11250/2635618 https://doi.org/10.1111/faf.12415 |
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ftimr:oai:imr.brage.unit.no:11250/2635618 2023-05-15T14:30:30+02:00 No room for dessert: A mechanistic model of prey selection in gut-limited predatory fish Fall, Johanna Jennifer Elisabeth Fiksen, Øyvind 2019 application/pdf http://hdl.handle.net/11250/2635618 https://doi.org/10.1111/faf.12415 eng eng Norges forskningsråd: 255460 Norges forskningsråd: 243676 Fish and Fisheries. 2019, 1-17. urn:issn:1467-2960 http://hdl.handle.net/11250/2635618 https://doi.org/10.1111/faf.12415 cristin:1760038 1-17 Fish and Fisheries Journal article Peer reviewed 2019 ftimr https://doi.org/10.1111/faf.12415 2021-09-23T20:15:50Z Predatory 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. publishedVersion Article in Journal/Newspaper Arctic cod Arctic atlantic cod Barents Sea Gadus morhua Northeast Arctic cod Northeast Atlantic Institute for Marine Research: Brage IMR Arctic Barents Sea Fish and Fisheries 21 1 63 79 |
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Open Polar |
collection |
Institute for Marine Research: Brage IMR |
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ftimr |
language |
English |
description |
Predatory 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. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Fall, Johanna Jennifer Elisabeth Fiksen, Øyvind |
spellingShingle |
Fall, Johanna Jennifer Elisabeth Fiksen, Øyvind No room for dessert: A mechanistic model of prey selection in gut-limited predatory fish |
author_facet |
Fall, Johanna Jennifer Elisabeth Fiksen, Øyvind |
author_sort |
Fall, Johanna Jennifer Elisabeth |
title |
No room for dessert: A mechanistic model of prey selection in gut-limited predatory fish |
title_short |
No room for dessert: A mechanistic model of prey selection in gut-limited predatory fish |
title_full |
No room for dessert: A mechanistic model of prey selection in gut-limited predatory fish |
title_fullStr |
No room for dessert: A mechanistic model of prey selection in gut-limited predatory fish |
title_full_unstemmed |
No room for dessert: A mechanistic model of prey selection in gut-limited predatory fish |
title_sort |
no room for dessert: a mechanistic model of prey selection in gut-limited predatory fish |
publishDate |
2019 |
url |
http://hdl.handle.net/11250/2635618 https://doi.org/10.1111/faf.12415 |
geographic |
Arctic Barents Sea |
geographic_facet |
Arctic Barents Sea |
genre |
Arctic cod Arctic atlantic cod Barents Sea Gadus morhua Northeast Arctic cod Northeast Atlantic |
genre_facet |
Arctic cod Arctic atlantic cod Barents Sea Gadus morhua Northeast Arctic cod Northeast Atlantic |
op_source |
1-17 Fish and Fisheries |
op_relation |
Norges forskningsråd: 255460 Norges forskningsråd: 243676 Fish and Fisheries. 2019, 1-17. urn:issn:1467-2960 http://hdl.handle.net/11250/2635618 https://doi.org/10.1111/faf.12415 cristin:1760038 |
op_doi |
https://doi.org/10.1111/faf.12415 |
container_title |
Fish and Fisheries |
container_volume |
21 |
container_issue |
1 |
container_start_page |
63 |
op_container_end_page |
79 |
_version_ |
1766304341133623296 |