Diankha O., Ba A., Brehmer Patrice, Brochier Timothée, Thiaw M., Sow B.A., Gaye A.T., Demarcq Hervé. (2017). Influence of climatic variables on Sardinella recruitment dynamique in Senegalese waters [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, p. 39. ICAWA : International Conference AWA, 3., Dakar (SEN), 2016/12/13-15. ISBN 978-2-9553602-0-5.
Titre du document
Influence of climatic variables on Sardinella recruitment dynamique in Senegalese waters [résumé]
Année de publication
2017
Type de document
Colloque
Auteurs
Diankha O., Ba A., Brehmer Patrice, Brochier Timothée, Thiaw M., Sow B.A., Gaye A.T., Demarcq Hervé
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
Source
Dakar : SRFC/CSRP ; IRD, 2017,
p. 39 ISBN 978-2-9553602-0-5
Colloque
ICAWA : International Conference AWA, 3., Dakar (SEN), 2016/12/13-15
Several authors, with estimated abundance index, attempted to study the dynamic of Sardinella populations in relation with to their environment fluctuations in West African region. However, this relationship still poorly understood because of the complexity and difficulty to estimate this abundance index that depends on a variable difficult to identify, the fishing effort from artisanal fisheries. This study is a contribution to better understand the link between the variability of environmental conditions and the dynamic of Sardinella aurita and Sardinella maderensis in Senegalese waters using generalized additive model. Recruitment data of these two species estimated from the virtual population analysis model, sea surface temperature, coastal upwelling index, wind speed, surface chlorophyll concentration and north Atlantic oscillation index within 2004-2013 period were used. Our results showed that recruitment of these two small pelagic species are closely linked to changes in the climatic variables tested. However, variables playing the most critical roles differ from one species to another. For the S. aurita, the index of coastal upwelling is the most important factor, while for S. maderensis is the SST which plays the leading role. This study also reveals the existence of temperature, intensity of upwelling, wind speed, concentration of chlorophyll-a and north Atlantic oscillation index thresholds above or below which Sardinella recruitment success is low.
Plan de classement
Sciences du milieu [021]
;
Ressources halieutiques [040]
Description Géographique
SENEGAL ; ATLANTIQUE
Localisation
Fonds IRD [F A010071832]
Identifiant IRD
fdi:010072110
