Data/hora: 11/06/2024 03:26:07

Provedor de dados: | 5
País: | France
Título: | Integrating taxon-based, trait-based and trophic-network approaches to study community dynamics in an exploited ecosystem, the Celtic Sea
Autores: | Merillet, Laurene.
Data: | 2020-11-20
Ano: | 2020
Palavras-chave: | Approche écosystémique des pêches; Dynamiques spatio-temporelles; Traits d’histoire de vie; Réseaux trophiques; Gestion des ressources; Ecosystem approach to fisheries; Spatio-temporal dynamics; Community ecology; Life-history traits; Food webs; Resource management.
Resumo: | Marine ecosystems face many pressures, the main ones being fishing and climate change. These pressures do not have the same consequences on the different facets of biodiversity, e.g. on taxa, traits and networks, and their study is necessary for the implementation of an ecosystem approach to fisheries. The Celtic Sea is a very important fishing area for European fisheries, with a specific richness greater than adjacent areas. Based on a time series from 2000 to 2016, I have studied the spatio-temporal dynamics of 101 species of the ecosystem. Over this period, taxonomic biodiversity was stable, and the importance of fishing as a structuring variable for communities decreased after 2009, and was lower than the environment (depth, chlorophyll a concentration and temperature). Following a local decrease in fishing pressure, the biomass of species with life history strategies characterised by a low renewal rate and present in the central Celtic Sea, increased. In particular, the increase in the biomass of six species of elasmobranchs has been linked to the creation of a seasonal fishing closure in the area. This vision of fishing sensitivity was enriched with data from the exploitation of underwater videos. This made it possible to highlight the presence of sensitive areas in the western Celtic Sea, along the continental slope. In addition, the study of interaction networks linking species, and in particular trophic networks, allowed considering the dynamics of the entire ecosystem based on its components. In the Celtic Sea, the sensitivity of species to fishing does not imply the sensitivity of the network to this pressure. On the other hand, the trophic network is not very robust to the loss of the 7% of the most exploited species and basal species.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00666/77806/79980.pdf

https://archimer.ifremer.fr/doc/00666/77806/

Editor: | MNHN
Formato: | application/pdf

Fonte:

info:eu-repo/semantics/openAccess

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