| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Do population and community metrics tell the same story about recent changes in Northern Mediterranean fish communities?
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| Autores: |
Rochet, Marie-joelle
Trenkel, Verena
Gil De Sola, Luis
Politou, Chrissi-yianna
Tserpes, George
Bertrand, Jacques
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| Data: |
2007
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| Ano: |
2007
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| Palavras-chave: |
Community metrics
Ecosystem approach to fisheries
Fish community
Length-based metrics
Mediterranean
Survey data
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| Resumo: |
This document presents a comparative study of human impacts on the length-structure of fish communities across North-Mediterranean ecosystems. We use survey data to examine trends in length-based metrics and their consistency within and among the two levels of organisation populations and communities, and to suggest interpretations of observed trend combinations. We start from a set of population processes potentially affected by human pressures: fishing will induce mortality especially in target species, whereas the hydrological environment and eutrophication potentially affect recruitment and individual growth. How population changes will be reflected at the community level is expected to depend on community evenness. Based on this expectation, a tentative theory for predicting the joint response of a suite of population and community length-based metrics to potential changes in the environment is proposed. The trends in these metrics from survey data are then examined, focusing on the consistency with the above predictions. The potential causes suggested for the observed trends are then checked against independent evidence of environmental and human pressures on these communities. The approach is applied to the MEDITS survey data, which cover a series of neighbouring fish communities undergoing various human pressures, including fishing, coastal pollution and eutrophication, and a possible change in temperature and hydrology over the last decade.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/00133/24377/22389.pdf
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| Editor: |
ICES CM 2007 / D:16
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| Relação: |
http://archimer.ifremer.fr/doc/00133/24377/
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| Formato: |
application/pdf
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| Direitos: |
2007 International Council for the Exploration of the Sea
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