Indicators of body size variability in a highly developed small-scale fishery: Ecological and management implications

Body size plays a key role for the productivity and resilience of marine populations. This work analyses the variation in body size indicators taken from ~ 400 000 individuals during the period 2000–2018 for a set of 20 key commercial species of the small-scale fishery of Galicia (SW Europe). Mean b...

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Autores principales:	Alexandre Alonso-Fernández, Jaime Otero, Rafael Bañón
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Body size Skewness Length at maturity Linear mixed effects models Dynamic factor analysis Small-scale fishery Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/0dcb4b9910104c99bdd074cad23f861b
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spelling	oai:doaj.org-article:0dcb4b9910104c99bdd074cad23f861b2021-12-01T04:36:35ZIndicators of body size variability in a highly developed small-scale fishery: Ecological and management implications1470-160X10.1016/j.ecolind.2020.107141https://doaj.org/article/0dcb4b9910104c99bdd074cad23f861b2021-02-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X20310803https://doaj.org/toc/1470-160XBody size plays a key role for the productivity and resilience of marine populations. This work analyses the variation in body size indicators taken from ~ 400 000 individuals during the period 2000–2018 for a set of 20 key commercial species of the small-scale fishery of Galicia (SW Europe). Mean body size showed relatively stable inter-annual trends during the study period, and, at the year level, mean body size for most species followed seasonal cycles. Body size was negatively related to the number of individuals caught per haul. Bathymetry also explained part of the variation in individual body size with species-specific depth affinities. Common trends in the species’ body size showed an increasing trend in the northern region while decreasing in the south suggesting differences in local environmental conditions and/or in the dynamics of the fishery. The skewness of body size distributions varied slightly from year to year, although some species showed significant trends. The annual trend of the species-specific skewness was negatively related to the proportion of immature individuals in the catch and positively related to the rate of change in abundance, suggesting a reduction of recruitment success in response to differences in size-selective exploitation patterns probably ascribed to minimum landing size being generally below size at maturity. The combination of body size and abundance indicators revealed a relatively stable performance of some of the most important resources targeted by the Galician small-scale fishery sector during the last two decades. However, our study highlights also the need to align management measures with biological reference points in order to prevent long-term reductions in stock productivity.Alexandre Alonso-FernándezJaime OteroRafael BañónElsevierarticleBody sizeSkewnessLength at maturityLinear mixed effects modelsDynamic factor analysisSmall-scale fisheryEcologyQH540-549.5ENEcological Indicators, Vol 121, Iss , Pp 107141- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Body size Skewness Length at maturity Linear mixed effects models Dynamic factor analysis Small-scale fishery Ecology QH540-549.5
spellingShingle	Body size Skewness Length at maturity Linear mixed effects models Dynamic factor analysis Small-scale fishery Ecology QH540-549.5 Alexandre Alonso-Fernández Jaime Otero Rafael Bañón Indicators of body size variability in a highly developed small-scale fishery: Ecological and management implications
description	Body size plays a key role for the productivity and resilience of marine populations. This work analyses the variation in body size indicators taken from ~ 400 000 individuals during the period 2000–2018 for a set of 20 key commercial species of the small-scale fishery of Galicia (SW Europe). Mean body size showed relatively stable inter-annual trends during the study period, and, at the year level, mean body size for most species followed seasonal cycles. Body size was negatively related to the number of individuals caught per haul. Bathymetry also explained part of the variation in individual body size with species-specific depth affinities. Common trends in the species’ body size showed an increasing trend in the northern region while decreasing in the south suggesting differences in local environmental conditions and/or in the dynamics of the fishery. The skewness of body size distributions varied slightly from year to year, although some species showed significant trends. The annual trend of the species-specific skewness was negatively related to the proportion of immature individuals in the catch and positively related to the rate of change in abundance, suggesting a reduction of recruitment success in response to differences in size-selective exploitation patterns probably ascribed to minimum landing size being generally below size at maturity. The combination of body size and abundance indicators revealed a relatively stable performance of some of the most important resources targeted by the Galician small-scale fishery sector during the last two decades. However, our study highlights also the need to align management measures with biological reference points in order to prevent long-term reductions in stock productivity.
format	article
author	Alexandre Alonso-Fernández Jaime Otero Rafael Bañón
author_facet	Alexandre Alonso-Fernández Jaime Otero Rafael Bañón
author_sort	Alexandre Alonso-Fernández
title	Indicators of body size variability in a highly developed small-scale fishery: Ecological and management implications
title_short	Indicators of body size variability in a highly developed small-scale fishery: Ecological and management implications
title_full	Indicators of body size variability in a highly developed small-scale fishery: Ecological and management implications
title_fullStr	Indicators of body size variability in a highly developed small-scale fishery: Ecological and management implications
title_full_unstemmed	Indicators of body size variability in a highly developed small-scale fishery: Ecological and management implications
title_sort	indicators of body size variability in a highly developed small-scale fishery: ecological and management implications
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/0dcb4b9910104c99bdd074cad23f861b
work_keys_str_mv	AT alexandrealonsofernandez indicatorsofbodysizevariabilityinahighlydevelopedsmallscalefisheryecologicalandmanagementimplications AT jaimeotero indicatorsofbodysizevariabilityinahighlydevelopedsmallscalefisheryecologicalandmanagementimplications AT rafaelbanon indicatorsofbodysizevariabilityinahighlydevelopedsmallscalefisheryecologicalandmanagementimplications
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Indicators of body size variability in a highly developed small-scale fishery: Ecological and management implications

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