Density regulation in Northeast Atlantic fish populations: Density dependence is stronger in recruitment than in somatic growth
Population regulation is a central concept in ecology, yet in many cases its presence and the underlying mechanisms are difficult to demonstrate. The current paradigm maintains that marine fish populations are predominantly regulated by density‐dependent recruitment. While it is known that density‐d...
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Online Access: | https://hdl.handle.net/1956/18431 https://doi.org/10.1111/1365-2656.12800 |
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ftunivbergen:oai:bora.uib.no:1956/18431 2023-05-15T17:41:22+02:00 Density regulation in Northeast Atlantic fish populations: Density dependence is stronger in recruitment than in somatic growth Zimmermann, Fabian Ricard, Daniel Heino, Mikko Petteri 2018-02-28T13:47:16Z application/pdf https://hdl.handle.net/1956/18431 https://doi.org/10.1111/1365-2656.12800 eng eng Wiley urn:issn:1365-2656 urn:issn:0021-8790 https://hdl.handle.net/1956/18431 https://doi.org/10.1111/1365-2656.12800 cristin:1569510 Attribution CC BY http://creativecommons.org/licenses/by/4.0/ Copyright 2018 The Author(s) Journal of Animal Ecology early life stages fisheries ecology life-history strategy marine ecosystems population dynamics population regulation Peer reviewed Journal article 2018 ftunivbergen https://doi.org/10.1111/1365-2656.12800 2023-03-14T17:38:45Z Population regulation is a central concept in ecology, yet in many cases its presence and the underlying mechanisms are difficult to demonstrate. The current paradigm maintains that marine fish populations are predominantly regulated by density‐dependent recruitment. While it is known that density‐dependent somatic growth can be present too, its general importance remains unknown and most practical applications neglect it. This study aimed to close this gap by for the first time quantifying and comparing density dependence in growth and recruitment over a large set of fish populations. We fitted density‐dependent models to time‐series data on population size, recruitment and age‐specific weight from commercially exploited fish populations in the Northeast Atlantic Ocean and the Baltic Sea. Data were standardized to enable a direct comparison within and among populations, and estimated parameters were used to quantify the impact of density regulation on population biomass. Statistically significant density dependence in recruitment was detected in a large proportion of populations (70%), whereas for density dependence in somatic growth the prevalence of density dependence depended heavily on the method (26% and 69%). Despite age‐dependent variability, the density dependence in recruitment was consistently stronger among age groups and between alternative approaches that use weight‐at‐age or weight increments to assess growth. Estimates of density‐dependent reduction in biomass underlined these results: 97% of populations with statistically significant parameters for growth and recruitment showed a larger impact of density‐dependent recruitment on population biomass. The results reaffirm the importance of density‐dependent recruitment in marine fishes, yet they also show that density dependence in somatic growth is not uncommon. Furthermore, the results are important from an applied perspective because density dependence in somatic growth affects productivity and catch composition, and therefore the benefits of ... Article in Journal/Newspaper Northeast Atlantic University of Bergen: Bergen Open Research Archive (BORA-UiB) Journal of Animal Ecology 87 3 672 681 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
early life stages fisheries ecology life-history strategy marine ecosystems population dynamics population regulation |
spellingShingle |
early life stages fisheries ecology life-history strategy marine ecosystems population dynamics population regulation Zimmermann, Fabian Ricard, Daniel Heino, Mikko Petteri Density regulation in Northeast Atlantic fish populations: Density dependence is stronger in recruitment than in somatic growth |
topic_facet |
early life stages fisheries ecology life-history strategy marine ecosystems population dynamics population regulation |
description |
Population regulation is a central concept in ecology, yet in many cases its presence and the underlying mechanisms are difficult to demonstrate. The current paradigm maintains that marine fish populations are predominantly regulated by density‐dependent recruitment. While it is known that density‐dependent somatic growth can be present too, its general importance remains unknown and most practical applications neglect it. This study aimed to close this gap by for the first time quantifying and comparing density dependence in growth and recruitment over a large set of fish populations. We fitted density‐dependent models to time‐series data on population size, recruitment and age‐specific weight from commercially exploited fish populations in the Northeast Atlantic Ocean and the Baltic Sea. Data were standardized to enable a direct comparison within and among populations, and estimated parameters were used to quantify the impact of density regulation on population biomass. Statistically significant density dependence in recruitment was detected in a large proportion of populations (70%), whereas for density dependence in somatic growth the prevalence of density dependence depended heavily on the method (26% and 69%). Despite age‐dependent variability, the density dependence in recruitment was consistently stronger among age groups and between alternative approaches that use weight‐at‐age or weight increments to assess growth. Estimates of density‐dependent reduction in biomass underlined these results: 97% of populations with statistically significant parameters for growth and recruitment showed a larger impact of density‐dependent recruitment on population biomass. The results reaffirm the importance of density‐dependent recruitment in marine fishes, yet they also show that density dependence in somatic growth is not uncommon. Furthermore, the results are important from an applied perspective because density dependence in somatic growth affects productivity and catch composition, and therefore the benefits of ... |
format |
Article in Journal/Newspaper |
author |
Zimmermann, Fabian Ricard, Daniel Heino, Mikko Petteri |
author_facet |
Zimmermann, Fabian Ricard, Daniel Heino, Mikko Petteri |
author_sort |
Zimmermann, Fabian |
title |
Density regulation in Northeast Atlantic fish populations: Density dependence is stronger in recruitment than in somatic growth |
title_short |
Density regulation in Northeast Atlantic fish populations: Density dependence is stronger in recruitment than in somatic growth |
title_full |
Density regulation in Northeast Atlantic fish populations: Density dependence is stronger in recruitment than in somatic growth |
title_fullStr |
Density regulation in Northeast Atlantic fish populations: Density dependence is stronger in recruitment than in somatic growth |
title_full_unstemmed |
Density regulation in Northeast Atlantic fish populations: Density dependence is stronger in recruitment than in somatic growth |
title_sort |
density regulation in northeast atlantic fish populations: density dependence is stronger in recruitment than in somatic growth |
publisher |
Wiley |
publishDate |
2018 |
url |
https://hdl.handle.net/1956/18431 https://doi.org/10.1111/1365-2656.12800 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
Journal of Animal Ecology |
op_relation |
urn:issn:1365-2656 urn:issn:0021-8790 https://hdl.handle.net/1956/18431 https://doi.org/10.1111/1365-2656.12800 cristin:1569510 |
op_rights |
Attribution CC BY http://creativecommons.org/licenses/by/4.0/ Copyright 2018 The Author(s) |
op_doi |
https://doi.org/10.1111/1365-2656.12800 |
container_title |
Journal of Animal Ecology |
container_volume |
87 |
container_issue |
3 |
container_start_page |
672 |
op_container_end_page |
681 |
_version_ |
1766142882113126400 |