Spatio-temporal variations in glass eel recruitment at the entrance pathways of a Mediterranean delta

Colin Bouchard; Hilaire Drouineau; Patrick LambertOlivier BoutronDelphine Nicolas

首页> 外文期刊>ICES journal of marine science: International Council for the Exploration of the Sea journal of marine science >Spatio-temporal variations in glass eel recruitment at the entrance pathways of a Mediterranean delta

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Spatio-temporal variations in glass eel recruitment at the entrance pathways of a Mediterranean delta

机译：Spatio-temporal variations in glass eel recruitment at the entrance pathways of a Mediterranean delta

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Understanding spatio-temporal dynamics of glass eel recruitment is necessary to characterize eel population status and the stock of future elvers. Despite numerous studies that have characterized recruitment across Europe, multiple systems along the Mediterranean coasts need a deeper look. We built a Bayesian State-Space Model to investigate the temporal variations in glass eel recruitment in the Rh?ne delta (France). The model was suited to address the spatial heterogeneity due to the complexity of this system constituted by numerous entrance pathways. Over 13 years, we found inter-annual variations without a particular trend. Here, an overall migration peak occurred in February-March for the system, but substantial spatial variations in the resulting recruitment were visible. Spatial variations in the inter-annual dynamics and migration peak pointed out the necessity to account for spatial heterogeneity in the dynamics of glass eel recruitment. The highlighted inter-annual variations are consistent with analysis of coincident time-series in other sites in Europe (e.g. WGEEL), and the migration peak’s timing is similar to peaks observed in other estuaries. Spatial variations in the migration peak suggest a potential effect of local environment conditions on the recruitment. Our model provided a suitable approach to investigate temporal variations while accounting for spatial heterogeneity.

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《ICES journal of marine science: International Council for the Exploration of the Sea journal of marine science》 |2022年第6期|1874-1887|共14页
作者
Colin Bouchard; Hilaire Drouineau; Patrick LambertOlivier BoutronDelphine Nicolas;
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Universite de Pau et des Pays de l’Adour, E2S UPPA, INRAE, ECOBIOP, 64310 Saint-Pee-sur- Nivelle, France,Tour du Valat Research Institute, Le Sambuc, 13200 Arles, France,Pole Gestion des Migrateurs Amphihalins dans leur Environnement, OFB, INRAE, Agrocamp;

UR EABX, INRAE, 33610 Cestas, France;

Tour du Valat Research Institute, Le Sambuc, 13200 Arles, France;

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正文语种英语
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Anguilla anguilla; Dirichlet distribution; glass eel; Hierarchical Bayesian Model; population dynamics; time-series;

Spatio-temporal variations in glass eel recruitment at the entrance pathways of a Mediterranean delta

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