Horizon / Plein textes La base de ressources documentaires de l'IRD

IRD

Publications des scientifiques de l'IRD

Sarré A., Demarcq Hervé, Faye S., Brehmer Patrice, Krakstad J.O., Thiao D., Elayoubi S. (2017). Climate-driven shift of Sardinella aurita stock in Northwest Africa ecosystem as evidenced by robust spatial indicators [résumé]. In : Brehmer Patrice (ed.), Ba B. (ed.), Kraus G. (ed.) International conference ICAWA 2016 : extended book of abstract : the AWA project : ecosystem approach to the management of fisheries and the marine environment in West African waters. Dakar : SRFC/CSRP ; IRD, 67-68. ICAWA : International Conference AWA, 3., Dakar (SEN), 2016/12/13-15. ISBN 978-2-9553602-0-5

Fichier PDF disponible http://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers18-01/010072122.pdf

Titre
Climate-driven shift of Sardinella aurita stock in Northwest Africa ecosystem as evidenced by robust spatial indicators [résumé]
Année de publication2017
Type de documentColloque
AuteursSarré A., Demarcq Hervé, Faye S., Brehmer Patrice, Krakstad J.O., Thiao D., Elayoubi S.
InBrehmer Patrice (ed.), Ba B. (ed.), Kraus G. (ed.) International conference ICAWA 2016 : extended book of abstract : the AWA project : ecosystem approach to the management of fisheries and the marine environment in West African waters
SourceDakar : SRFC/CSRP ; IRD, 2017, p. 67-68. ISBN 978-2-9553602-0-5
ColloqueICAWA : International Conference AWA, 3., Dakar (SEN), 2016/12/13-15
RésuméIn Northwest Africa, the small pelagic fish are in abundance and play a crucial role for the food safety of populations. The pelagic resources are exploited both by small-scale artisanal and industrial fleets. The landing structure of the countries in the region has been in perpetual change during the last years. The sardinella has been more and more landed by fishermen in Morocco, while the sardine has become a target by fishing vessels in Mauritania and Senegal. This indicates a modification in the distribution areas of pelagic resources. To verify this hypothesis, an outstanding database consisting in 14 acoustic surveys with a consistent and high sampling intensity (2263 trawl hauls) conducted by the RV Fridtjof Nansen from 1995 to 2015 was investigated in this study to identify trends in distribution shifts in pelagic fishes. A focus was made on sardinellas and the main species in the southern part of the region. Two strong spatial indicators are used in this study: the latitudinal extreme location and the barycentre of biomasses. Two clear trends can be observed from the data analysed. Firstly, in the southern and tropical part of this system the typical trend is that pelagic species show an increasing northward distribution. This applies to S. aurita, Trachurus trecae, Chloroscombrus chrysurus, Sphyraena guachancho and Brachydeuterus auritu. A second group is observed, those that do not show any clear trend in distributional shift, but where the distribution is stable over the period. The typical species observed here are S. maderensis and Decapterus rhonchus. Despite some variations in the upwelling intensity, we show that the sea surface temperature is by far the main parameter to explain this northern shift. We also discuss the likely - and largely unknown - influence of the under-estimation of the detections because of the absence of sampling in the shallow coastal zone. The impact of such displacements is also discussed in term of regional management of these shared stocks.
Plan de classementRessources halieutiques [040] ; Sciences du milieu [021]
LocalisationFonds IRD [F A010071832]
Identifiant IRDfdi:010072122
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010072122

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL


Accès aux documents originaux :

Le FDI est labellisé CollEx

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation

Bondy

Montpellier (centre IRD)

Montpellier (MSE)

Cayenne

Nouméa

Papeete

Abidjan

Dakar

Niamey

Ouagadougou

Tunis

La Paz

Quito