Predators with multiple ontogenetic niche shifts have limited potential for population growth and top-down control of their prey
Catastrophic collapses of top predators have revealed trophic cascades and community structuring by top-down control. When populations fail to recover after a collapse, this may indicate alternative stable states in the system. Overfishing has caused several of the most compelling cases of these dyn...
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Institutionen för ekologi, miljö och geovetenskap
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Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-78947 https://doi.org/10.1086/670614 |
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ftumeauniv:oai:DiVA.org:umu-78947 2023-10-09T21:49:47+02:00 Predators with multiple ontogenetic niche shifts have limited potential for population growth and top-down control of their prey van Leeuwen, Anieke Huss, Magnus Gardmark, Anna Casini, Michele Vitale, Francesca Hjelm, Joakim Persson, Lennart de Roos, Andre M 2013 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-78947 https://doi.org/10.1086/670614 eng eng Institutionen för ekologi, miljö och geovetenskap American Naturalist, 0003-0147, 2013, 182:1, s. 53-66 http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-78947 doi:10.1086/670614 ISI:000320587300007 Scopus 2-s2.0-84879164621 info:eu-repo/semantics/openAccess ontogenetic niche shifts life-cycle complexity mixed interactions predator-prey dynamics Gadus morhua size-structured population Environmental Sciences Miljövetenskap Article in journal info:eu-repo/semantics/article text 2013 ftumeauniv https://doi.org/10.1086/670614 2023-09-22T13:58:11Z Catastrophic collapses of top predators have revealed trophic cascades and community structuring by top-down control. When populations fail to recover after a collapse, this may indicate alternative stable states in the system. Overfishing has caused several of the most compelling cases of these dynamics, and in particular Atlantic cod stocks exemplify such lack of recovery. Often, competition between prey species and juvenile predators is hypothesized to explain the lack of recovery of predator populations. The predator is then considered to compete with its prey for one resource when small and to subsequently shift to piscivory. Yet predator life history is often more complex than that, including multiple ontogenetic diet shifts. Here we show that no alternative stable states occur when predators in an intermediate life stage feed on an additional resource (exclusive to the predator) before switching to piscivory, because predation and competition between prey and predator do not simultaneously structure community dynamics. We find top-down control by the predator only when there is no feedback from predator foraging on the additional resource. Otherwise, the predator population dynamics are governed by a bottleneck in individual growth occurring in the intermediate life stage. Therefore, additional resources for predators may be beneficial or detrimental for predator population growth and strongly influence the potential for top-down community control. This study is part of the PLAN FISH project, financially supported by the Swedish Environmental Protection Agency and the Swedish Board of Fisheries. Article in Journal/Newspaper atlantic cod Gadus morhua Umeå University: Publications (DiVA) The American Naturalist 182 1 53 66 |
institution |
Open Polar |
collection |
Umeå University: Publications (DiVA) |
op_collection_id |
ftumeauniv |
language |
English |
topic |
ontogenetic niche shifts life-cycle complexity mixed interactions predator-prey dynamics Gadus morhua size-structured population Environmental Sciences Miljövetenskap |
spellingShingle |
ontogenetic niche shifts life-cycle complexity mixed interactions predator-prey dynamics Gadus morhua size-structured population Environmental Sciences Miljövetenskap van Leeuwen, Anieke Huss, Magnus Gardmark, Anna Casini, Michele Vitale, Francesca Hjelm, Joakim Persson, Lennart de Roos, Andre M Predators with multiple ontogenetic niche shifts have limited potential for population growth and top-down control of their prey |
topic_facet |
ontogenetic niche shifts life-cycle complexity mixed interactions predator-prey dynamics Gadus morhua size-structured population Environmental Sciences Miljövetenskap |
description |
Catastrophic collapses of top predators have revealed trophic cascades and community structuring by top-down control. When populations fail to recover after a collapse, this may indicate alternative stable states in the system. Overfishing has caused several of the most compelling cases of these dynamics, and in particular Atlantic cod stocks exemplify such lack of recovery. Often, competition between prey species and juvenile predators is hypothesized to explain the lack of recovery of predator populations. The predator is then considered to compete with its prey for one resource when small and to subsequently shift to piscivory. Yet predator life history is often more complex than that, including multiple ontogenetic diet shifts. Here we show that no alternative stable states occur when predators in an intermediate life stage feed on an additional resource (exclusive to the predator) before switching to piscivory, because predation and competition between prey and predator do not simultaneously structure community dynamics. We find top-down control by the predator only when there is no feedback from predator foraging on the additional resource. Otherwise, the predator population dynamics are governed by a bottleneck in individual growth occurring in the intermediate life stage. Therefore, additional resources for predators may be beneficial or detrimental for predator population growth and strongly influence the potential for top-down community control. This study is part of the PLAN FISH project, financially supported by the Swedish Environmental Protection Agency and the Swedish Board of Fisheries. |
format |
Article in Journal/Newspaper |
author |
van Leeuwen, Anieke Huss, Magnus Gardmark, Anna Casini, Michele Vitale, Francesca Hjelm, Joakim Persson, Lennart de Roos, Andre M |
author_facet |
van Leeuwen, Anieke Huss, Magnus Gardmark, Anna Casini, Michele Vitale, Francesca Hjelm, Joakim Persson, Lennart de Roos, Andre M |
author_sort |
van Leeuwen, Anieke |
title |
Predators with multiple ontogenetic niche shifts have limited potential for population growth and top-down control of their prey |
title_short |
Predators with multiple ontogenetic niche shifts have limited potential for population growth and top-down control of their prey |
title_full |
Predators with multiple ontogenetic niche shifts have limited potential for population growth and top-down control of their prey |
title_fullStr |
Predators with multiple ontogenetic niche shifts have limited potential for population growth and top-down control of their prey |
title_full_unstemmed |
Predators with multiple ontogenetic niche shifts have limited potential for population growth and top-down control of their prey |
title_sort |
predators with multiple ontogenetic niche shifts have limited potential for population growth and top-down control of their prey |
publisher |
Institutionen för ekologi, miljö och geovetenskap |
publishDate |
2013 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-78947 https://doi.org/10.1086/670614 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_relation |
American Naturalist, 0003-0147, 2013, 182:1, s. 53-66 http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-78947 doi:10.1086/670614 ISI:000320587300007 Scopus 2-s2.0-84879164621 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1086/670614 |
container_title |
The American Naturalist |
container_volume |
182 |
container_issue |
1 |
container_start_page |
53 |
op_container_end_page |
66 |
_version_ |
1779312832459833344 |