Density regulation in Northeast Atlantic fish populations: density dependence is stronger in recruitment than in somatic growth
1.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. 2.While it is known that densi...
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British Ecological Society
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ftiiasalaxenburg:oai:pure.iiasa.ac.at:15087 2023-05-15T17:41:21+02:00 Density regulation in Northeast Atlantic fish populations: density dependence is stronger in recruitment than in somatic growth Zimmermann, F. Ricard, D. Heino, M. 2018-01-30 text https://pure.iiasa.ac.at/id/eprint/15087/ https://pure.iiasa.ac.at/id/eprint/15087/1/Zimmermann_et_al-2018-Journal_of_Animal_Ecology.pdf https://doi.org/10.1111/1365-2656.12800 en eng British Ecological Society https://pure.iiasa.ac.at/id/eprint/15087/1/Zimmermann_et_al-2018-Journal_of_Animal_Ecology.pdf Zimmermann, F., Ricard, D., & Heino, M. <https://pure.iiasa.ac.at/view/iiasa/122.html> orcid:0000-0003-2928-3940 (2018). Density regulation in Northeast Atlantic fish populations: density dependence is stronger in recruitment than in somatic growth. Journal of Animal Ecology 87 (3) 672-681. 10.1111/1365-2656.12800 <https://doi.org/10.1111/1365-2656.12800>. doi:10.1111/1365-2656.12800 cc_by_4 Article PeerReviewed 2018 ftiiasalaxenburg https://doi.org/10.1111/1365-2656.12800 2023-04-07T14:53:01Z 1.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. 2.While it is known that density-dependent somatic growth can be present too, its general importance is 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. 3.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 standardised to enable a direct comparison within and among populations, and estimated parameters were used to quantify the impact of density regulation on population biomass. 4.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 of 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. 5.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. Further, 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 IIASA PURE (International Institute of Applied Systems Analysis: PUblications REpository) Journal of Animal Ecology 87 3 672 681 |
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ftiiasalaxenburg |
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English |
description |
1.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. 2.While it is known that density-dependent somatic growth can be present too, its general importance is 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. 3.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 standardised to enable a direct comparison within and among populations, and estimated parameters were used to quantify the impact of density regulation on population biomass. 4.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 of 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. 5.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. Further, 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, F. Ricard, D. Heino, M. |
spellingShingle |
Zimmermann, F. Ricard, D. Heino, M. Density regulation in Northeast Atlantic fish populations: density dependence is stronger in recruitment than in somatic growth |
author_facet |
Zimmermann, F. Ricard, D. Heino, M. |
author_sort |
Zimmermann, F. |
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 |
British Ecological Society |
publishDate |
2018 |
url |
https://pure.iiasa.ac.at/id/eprint/15087/ https://pure.iiasa.ac.at/id/eprint/15087/1/Zimmermann_et_al-2018-Journal_of_Animal_Ecology.pdf https://doi.org/10.1111/1365-2656.12800 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
https://pure.iiasa.ac.at/id/eprint/15087/1/Zimmermann_et_al-2018-Journal_of_Animal_Ecology.pdf Zimmermann, F., Ricard, D., & Heino, M. <https://pure.iiasa.ac.at/view/iiasa/122.html> orcid:0000-0003-2928-3940 (2018). Density regulation in Northeast Atlantic fish populations: density dependence is stronger in recruitment than in somatic growth. Journal of Animal Ecology 87 (3) 672-681. 10.1111/1365-2656.12800 <https://doi.org/10.1111/1365-2656.12800>. doi:10.1111/1365-2656.12800 |
op_rights |
cc_by_4 |
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 |
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1766142867650117632 |