Effect of environmental conditions on the seasonal and inter‐annual variability of small pelagic fish abundance off North‐West Africa: The case of both Senegalese sardinella
Abstract The objective of this study was to assess the effect of environmental variations on the abundance of Sardinella aurita and Sardinella maderensis in Senegalese waters in the upwelling system. Monthly data indicating the abundance of sardinella were first estimated from commercial statistics,...
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Online Access: | http://dx.doi.org/10.1111/fog.12218 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Ffog.12218 https://onlinelibrary.wiley.com/doi/pdf/10.1111/fog.12218 |
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crwiley:10.1111/fog.12218 2024-06-23T07:55:16+00:00 Effect of environmental conditions on the seasonal and inter‐annual variability of small pelagic fish abundance off North‐West Africa: The case of both Senegalese sardinella Thiaw, Modou Auger, Pierre‐Amaël Ngom, Fambaye Brochier, Timothée Faye, Saliou Diankha, Ousmane Brehmer, Patrice Bundesministerium für Bildung und Forschung 2017 http://dx.doi.org/10.1111/fog.12218 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Ffog.12218 https://onlinelibrary.wiley.com/doi/pdf/10.1111/fog.12218 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Fisheries Oceanography volume 26, issue 5, page 583-601 ISSN 1054-6006 1365-2419 journal-article 2017 crwiley https://doi.org/10.1111/fog.12218 2024-06-06T04:23:41Z Abstract The objective of this study was to assess the effect of environmental variations on the abundance of Sardinella aurita and Sardinella maderensis in Senegalese waters in the upwelling system. Monthly data indicating the abundance of sardinella were first estimated from commercial statistics, using Generalized Linear Model from 1966 to 2011. Abundance indices (AIs) were then compared with environmental indices, at the local scale, a Coastal Upwelling Index (CUI) and a coastal Sea Surface Temperature (SST) index, and on a large scale, the North Atlantic Oscillation (NAO), the Atlantic Multidecadal Oscillation (AMO) and the Multivariate El Niño Southern Oscillation Index (MEI), using correlations and times series analyses. The results showed that the abundance of sardinella is determined by a strong seasonal pattern and inter‐annual fluctuations. The abundance of S. aurita peaked in spring and in autumn, whereas that of S. maderensis peaked in the warm season (July–September). The trend of the sardinella abundance was significantly correlated with the CUI, especially in autumn and spring. Interannual fluctuations of S. maderensis and S. aurita abundance are, respectively, driven by the precocity and the duration of the upwelling season that is attributed to distinct migration patterns. Both sardinella species also respond with a delay of around 4 years to the winter NAO index and the autumn CUI, and the AMO index, respectively, both related to migration patterns. The wide variations in sardinella biomass are caused by variations in environmental conditions, which should be considered in the implementation of an ecosystem‐based approach in sardinella stocks management. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Wiley Online Library Fisheries Oceanography 26 5 583 601 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract The objective of this study was to assess the effect of environmental variations on the abundance of Sardinella aurita and Sardinella maderensis in Senegalese waters in the upwelling system. Monthly data indicating the abundance of sardinella were first estimated from commercial statistics, using Generalized Linear Model from 1966 to 2011. Abundance indices (AIs) were then compared with environmental indices, at the local scale, a Coastal Upwelling Index (CUI) and a coastal Sea Surface Temperature (SST) index, and on a large scale, the North Atlantic Oscillation (NAO), the Atlantic Multidecadal Oscillation (AMO) and the Multivariate El Niño Southern Oscillation Index (MEI), using correlations and times series analyses. The results showed that the abundance of sardinella is determined by a strong seasonal pattern and inter‐annual fluctuations. The abundance of S. aurita peaked in spring and in autumn, whereas that of S. maderensis peaked in the warm season (July–September). The trend of the sardinella abundance was significantly correlated with the CUI, especially in autumn and spring. Interannual fluctuations of S. maderensis and S. aurita abundance are, respectively, driven by the precocity and the duration of the upwelling season that is attributed to distinct migration patterns. Both sardinella species also respond with a delay of around 4 years to the winter NAO index and the autumn CUI, and the AMO index, respectively, both related to migration patterns. The wide variations in sardinella biomass are caused by variations in environmental conditions, which should be considered in the implementation of an ecosystem‐based approach in sardinella stocks management. |
author2 |
Bundesministerium für Bildung und Forschung |
format |
Article in Journal/Newspaper |
author |
Thiaw, Modou Auger, Pierre‐Amaël Ngom, Fambaye Brochier, Timothée Faye, Saliou Diankha, Ousmane Brehmer, Patrice |
spellingShingle |
Thiaw, Modou Auger, Pierre‐Amaël Ngom, Fambaye Brochier, Timothée Faye, Saliou Diankha, Ousmane Brehmer, Patrice Effect of environmental conditions on the seasonal and inter‐annual variability of small pelagic fish abundance off North‐West Africa: The case of both Senegalese sardinella |
author_facet |
Thiaw, Modou Auger, Pierre‐Amaël Ngom, Fambaye Brochier, Timothée Faye, Saliou Diankha, Ousmane Brehmer, Patrice |
author_sort |
Thiaw, Modou |
title |
Effect of environmental conditions on the seasonal and inter‐annual variability of small pelagic fish abundance off North‐West Africa: The case of both Senegalese sardinella |
title_short |
Effect of environmental conditions on the seasonal and inter‐annual variability of small pelagic fish abundance off North‐West Africa: The case of both Senegalese sardinella |
title_full |
Effect of environmental conditions on the seasonal and inter‐annual variability of small pelagic fish abundance off North‐West Africa: The case of both Senegalese sardinella |
title_fullStr |
Effect of environmental conditions on the seasonal and inter‐annual variability of small pelagic fish abundance off North‐West Africa: The case of both Senegalese sardinella |
title_full_unstemmed |
Effect of environmental conditions on the seasonal and inter‐annual variability of small pelagic fish abundance off North‐West Africa: The case of both Senegalese sardinella |
title_sort |
effect of environmental conditions on the seasonal and inter‐annual variability of small pelagic fish abundance off north‐west africa: the case of both senegalese sardinella |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1111/fog.12218 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Ffog.12218 https://onlinelibrary.wiley.com/doi/pdf/10.1111/fog.12218 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Fisheries Oceanography volume 26, issue 5, page 583-601 ISSN 1054-6006 1365-2419 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/fog.12218 |
container_title |
Fisheries Oceanography |
container_volume |
26 |
container_issue |
5 |
container_start_page |
583 |
op_container_end_page |
601 |
_version_ |
1802647783120830464 |