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Population density and temperature correlate with long-term trends in somatic growth rates and maturation schedules of herring and sprat

We examine long-term trends in the average growth rates and maturation schedules of herring and sprat populations using survey data collected from the North Sea and west of Scotland since the 1960s and 1980s respectively. Otolith age data and maturity data are used to calculate time series of mean l...

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Detalles Bibliográficos
Autores principales: Hunter, Aidan, Speirs, Douglas C., Heath, Michael R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6402831/
https://www.ncbi.nlm.nih.gov/pubmed/30840654
http://dx.doi.org/10.1371/journal.pone.0212176
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author Hunter, Aidan
Speirs, Douglas C.
Heath, Michael R.
author_facet Hunter, Aidan
Speirs, Douglas C.
Heath, Michael R.
author_sort Hunter, Aidan
collection PubMed
description We examine long-term trends in the average growth rates and maturation schedules of herring and sprat populations using survey data collected from the North Sea and west of Scotland since the 1960s and 1980s respectively. Otolith age data and maturity data are used to calculate time series of mean lengths at age, von Bertalanffy growth parameters, and probabilistic maturation reaction norms. As the growth and maturation of fish is known to be influenced by temperature and stock abundances, we account for these variables using Generalised Additive Models. Each of the herring populations displayed either steady declines in mean length across multiple age groups, or declines in length followed years later by some recovery. Depending on region, lengths at age of sprat increased or decreased over time. Varying temporal trends in maturation propensity at age and length were observed across herring populations. Many of the trends in growth rate and maturation were correlated to population abundance and/or temperature. In general, abundance is shown to be negatively correlated to growth rates in herring and sprat, and positively correlated with maturation propensity in herring. Temperature is also shown to be correlated to growth and maturation, and although the effect is consistent within species, the temperature effects differ between herring and sprat. This study provides detailed information about long-term trends in growth and maturation, which is lacking for some of these pelagic stocks, especially in the west of Scotland.
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spelling pubmed-64028312019-03-17 Population density and temperature correlate with long-term trends in somatic growth rates and maturation schedules of herring and sprat Hunter, Aidan Speirs, Douglas C. Heath, Michael R. PLoS One Research Article We examine long-term trends in the average growth rates and maturation schedules of herring and sprat populations using survey data collected from the North Sea and west of Scotland since the 1960s and 1980s respectively. Otolith age data and maturity data are used to calculate time series of mean lengths at age, von Bertalanffy growth parameters, and probabilistic maturation reaction norms. As the growth and maturation of fish is known to be influenced by temperature and stock abundances, we account for these variables using Generalised Additive Models. Each of the herring populations displayed either steady declines in mean length across multiple age groups, or declines in length followed years later by some recovery. Depending on region, lengths at age of sprat increased or decreased over time. Varying temporal trends in maturation propensity at age and length were observed across herring populations. Many of the trends in growth rate and maturation were correlated to population abundance and/or temperature. In general, abundance is shown to be negatively correlated to growth rates in herring and sprat, and positively correlated with maturation propensity in herring. Temperature is also shown to be correlated to growth and maturation, and although the effect is consistent within species, the temperature effects differ between herring and sprat. This study provides detailed information about long-term trends in growth and maturation, which is lacking for some of these pelagic stocks, especially in the west of Scotland. Public Library of Science 2019-03-06 /pmc/articles/PMC6402831/ /pubmed/30840654 http://dx.doi.org/10.1371/journal.pone.0212176 Text en © 2019 Hunter et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Hunter, Aidan
Speirs, Douglas C.
Heath, Michael R.
Population density and temperature correlate with long-term trends in somatic growth rates and maturation schedules of herring and sprat
title Population density and temperature correlate with long-term trends in somatic growth rates and maturation schedules of herring and sprat
title_full Population density and temperature correlate with long-term trends in somatic growth rates and maturation schedules of herring and sprat
title_fullStr Population density and temperature correlate with long-term trends in somatic growth rates and maturation schedules of herring and sprat
title_full_unstemmed Population density and temperature correlate with long-term trends in somatic growth rates and maturation schedules of herring and sprat
title_short Population density and temperature correlate with long-term trends in somatic growth rates and maturation schedules of herring and sprat
title_sort population density and temperature correlate with long-term trends in somatic growth rates and maturation schedules of herring and sprat
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6402831/
https://www.ncbi.nlm.nih.gov/pubmed/30840654
http://dx.doi.org/10.1371/journal.pone.0212176
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