Data/hora: 06/06/2024 09:53:03

Provedor de dados: | 5
País: | France

Título:

Caractérisation et connectivité des Habitats Ecologiques Essentiels des stades adulte et juvénile du bar européen

Characterisation and connectivity between the Essential Fish Habitats of adults and juveniles European seabass

Autores: | Dambrine, Chloe.
Data: | 2020-12-04
Ano: | 2020
Palavras-chave: | Frayères; Nourriceries; Dynamique spatio-temporelle; Dicentrarchus labrax; Spawning areas; Nurseries; Spatio-temporal dynamic; Dicentrarchus labrax.
Resumo: | Essential Fish Habitats host, at least, one stage of their life cycle. As they can be distant, maintaining their connectivity is essential for the closure of fish life cycle and populations’ sustainability. This thesis focused on the connectivity between spawning areas and nurseries of European seabass. Its main spawning areas have been characterised using a non-linear geostatistical approach applied to highly resolved fishery data. A Bayesian spatio-temporal model showed that they are mainly explained by a stable spatio-temporal structure, rather than by hydro-climatic factors. A bioenergetics model (DEB) over the entire life cycle of seabass was developed and validated for the early life stages. It showed that larvae and juveniles are resistant to low temperatures and food deprivation experienced during their first months of life due to a spawning in winter. The spawning areas — nurseries’ connectivity was analysed via an individual-based model including the DEB model previously developed and coupled to a hydrodynamic model. Through scenarios of increasing complexity, the potential most important spawning areas and nurseries for the species were identified. On average, the drift success is higher in the English Channel than in the Bay of Biscay. Recurrent offshore spawning areas allow the colonisation of numerous nurseries, while coastal one supply in quantity the closest nurseries. Connectivity between spawning areas in the northern Bay of Biscay and nurseries in the Western English Channel exists but is not recurrent, except between the Rochebonne plateau and the Iroise Sea. These results are intended to help managers in their measures’ choices for this species of high economical value.
Tipo: | Text
Idioma: | Francês

Identificador:

https://archimer.ifremer.fr/doc/00676/78811/81055.pdf

https://archimer.ifremer.fr/doc/00676/78811/

Editor: | Unversité de Bretagne Occidentale
Formato: | application/pdf

Fonte:

info:eu-repo/semantics/openAccess

restricted use