Analysis of the effect of atmospheric oscillations on physical condition of pre–reproductive bluefin tuna from the Strait of Gibraltar
The aim of this study was to explore the possible effects of atmospheric oscillations: North Atlantic Oscillation (NAO) and Arctic Oscillation (AO), on the physical condition of bluefin tuna (Thunnus thynnus). We estimated a fitness ratio from 3,501 pairs of length–weight data based on bluefin tuna...
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Museu de Ciències Naturals de Barcelona
2013
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ftdoajarticles:oai:doaj.org/article:acbb442ab38d4197bc8255f0c5f02dca 2023-05-15T14:59:56+02:00 Analysis of the effect of atmospheric oscillations on physical condition of pre–reproductive bluefin tuna from the Strait of Gibraltar Báez, J. C. Macías, D. De Castro, M. Gómez–Gesteira, M. Gimeno, L. Real, R. 2013-12-01T00:00:00Z https://doaj.org/article/acbb442ab38d4197bc8255f0c5f02dca EN ES eng spa Museu de Ciències Naturals de Barcelona http://abc.museucienciesjournals.cat/files/ABC_36-2_2013_pp_225-233.pdf https://doaj.org/toc/1578-665X 1578-665X https://doaj.org/article/acbb442ab38d4197bc8255f0c5f02dca Animal Biodiversity and Conservation, Vol 36, Iss 2, Pp 225-233 (2013) Arctic Oscillation Atmospheric Oscillations Clime North Atlantic Oscillation Fisheries Tuna Zoology QL1-991 article 2013 ftdoajarticles 2022-12-31T13:20:42Z The aim of this study was to explore the possible effects of atmospheric oscillations: North Atlantic Oscillation (NAO) and Arctic Oscillation (AO), on the physical condition of bluefin tuna (Thunnus thynnus). We estimated a fitness ratio from 3,501 pairs of length–weight data based on bluefin tuna caught in bait–boat fisheries before the spawning season (January, February and March), for each length class and year. In order to obtain a single fitness ratio (K–mean) per year we determined the average for all length classes. We also evaluated Le Cren’s condition index (KLC). We observed significant positive correlations between the atmospheric oscillations and both physical condition indexes. In the case of K–mean, the AO explained 75% of the observed variability. Regarding KLC, the NAO explained approximately 73% of the observed variability, while the AO explained 70% of the observed variability. The increase in physical conditions of bluefin tuna in association with positive atmospheric oscillations could be mediated by the increase in the prevalence of strong trade winds. We concluded that the increase in the prevalence of strong westerly winds, mediated by a positive AO or NAO, favours the trip from the Atlantic to the Mediterranean by reducing energy costs due to migration and by increasing the supply of nutrients at the surface by the mixing of deep water and surface water in local areas such as the Strait of Gibraltar. Article in Journal/Newspaper Arctic North Atlantic North Atlantic oscillation Directory of Open Access Journals: DOAJ Articles Arctic |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Spanish |
topic |
Arctic Oscillation Atmospheric Oscillations Clime North Atlantic Oscillation Fisheries Tuna Zoology QL1-991 |
spellingShingle |
Arctic Oscillation Atmospheric Oscillations Clime North Atlantic Oscillation Fisheries Tuna Zoology QL1-991 Báez, J. C. Macías, D. De Castro, M. Gómez–Gesteira, M. Gimeno, L. Real, R. Analysis of the effect of atmospheric oscillations on physical condition of pre–reproductive bluefin tuna from the Strait of Gibraltar |
topic_facet |
Arctic Oscillation Atmospheric Oscillations Clime North Atlantic Oscillation Fisheries Tuna Zoology QL1-991 |
description |
The aim of this study was to explore the possible effects of atmospheric oscillations: North Atlantic Oscillation (NAO) and Arctic Oscillation (AO), on the physical condition of bluefin tuna (Thunnus thynnus). We estimated a fitness ratio from 3,501 pairs of length–weight data based on bluefin tuna caught in bait–boat fisheries before the spawning season (January, February and March), for each length class and year. In order to obtain a single fitness ratio (K–mean) per year we determined the average for all length classes. We also evaluated Le Cren’s condition index (KLC). We observed significant positive correlations between the atmospheric oscillations and both physical condition indexes. In the case of K–mean, the AO explained 75% of the observed variability. Regarding KLC, the NAO explained approximately 73% of the observed variability, while the AO explained 70% of the observed variability. The increase in physical conditions of bluefin tuna in association with positive atmospheric oscillations could be mediated by the increase in the prevalence of strong trade winds. We concluded that the increase in the prevalence of strong westerly winds, mediated by a positive AO or NAO, favours the trip from the Atlantic to the Mediterranean by reducing energy costs due to migration and by increasing the supply of nutrients at the surface by the mixing of deep water and surface water in local areas such as the Strait of Gibraltar. |
format |
Article in Journal/Newspaper |
author |
Báez, J. C. Macías, D. De Castro, M. Gómez–Gesteira, M. Gimeno, L. Real, R. |
author_facet |
Báez, J. C. Macías, D. De Castro, M. Gómez–Gesteira, M. Gimeno, L. Real, R. |
author_sort |
Báez, J. C. |
title |
Analysis of the effect of atmospheric oscillations on physical condition of pre–reproductive bluefin tuna from the Strait of Gibraltar |
title_short |
Analysis of the effect of atmospheric oscillations on physical condition of pre–reproductive bluefin tuna from the Strait of Gibraltar |
title_full |
Analysis of the effect of atmospheric oscillations on physical condition of pre–reproductive bluefin tuna from the Strait of Gibraltar |
title_fullStr |
Analysis of the effect of atmospheric oscillations on physical condition of pre–reproductive bluefin tuna from the Strait of Gibraltar |
title_full_unstemmed |
Analysis of the effect of atmospheric oscillations on physical condition of pre–reproductive bluefin tuna from the Strait of Gibraltar |
title_sort |
analysis of the effect of atmospheric oscillations on physical condition of pre–reproductive bluefin tuna from the strait of gibraltar |
publisher |
Museu de Ciències Naturals de Barcelona |
publishDate |
2013 |
url |
https://doaj.org/article/acbb442ab38d4197bc8255f0c5f02dca |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic North Atlantic North Atlantic oscillation |
genre_facet |
Arctic North Atlantic North Atlantic oscillation |
op_source |
Animal Biodiversity and Conservation, Vol 36, Iss 2, Pp 225-233 (2013) |
op_relation |
http://abc.museucienciesjournals.cat/files/ABC_36-2_2013_pp_225-233.pdf https://doaj.org/toc/1578-665X 1578-665X https://doaj.org/article/acbb442ab38d4197bc8255f0c5f02dca |
_version_ |
1766332046754447360 |