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Theses

Bases biologiques et écologiques de la conservation du milieu marin en mer d'Iroise

Abstract : This study allows an approach to management and protection of the marine environment of the Iroise Sea which is based on biological and ecological knowledge gained for the whole area. This work forms part of the national and international concern for biodiversity conservation by the acquisition and synthesis of scientific knowledge and their restitution with the other interested parties of conservation management. The biological richness of this marine area is attested by the presence of flagship-species, but the benthic environment has remained largely ignored. This study provides data which complete knowledge on the sedimentology of the Iroise's bottoms and allows the specification of the sedimentary cover and its space and seasonal variability. A broad range of sediment types is represented, with a basic importance of cobbles and gravels and the organization of the sediments in superimposed layers, inducing a high habitat complexity ; moreover, space variability masks seasonal variability. Following this, the study of the benthic fauna of the soft sediment bottoms allows the definition of the habitats and communities of the marine environment of Iroise, with six main units of communities of species, each comprising several facets, of which some have great ecological and patrimonial values. The importance of the frontal zone and its influence on the benthic communities are highlighted. An analyse of the use of space and resources in the Iroise Sea is outlined, as well as an assessment concerning the biodiversity and the current state of international reflections on marine protected areas. The final synthesis identifies the interests of the habitats and communities of Iroise and the potential anthropogenic threats in the short and medium term. The priorities and solutions for the conservation of this marine environment are discussed and a multiple-use zoning plan is proposed within the context of the future National Marine Park of the Iroise Sea.
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https://tel.archives-ouvertes.fr/tel-00005791
Contributor : Coralie Raffin <>
Submitted on : Tuesday, April 6, 2004 - 11:22:36 AM
Last modification on : Tuesday, March 30, 2021 - 12:26:07 PM
Long-term archiving on: : Friday, April 2, 2010 - 8:17:01 PM

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  • HAL Id : tel-00005791, version 1

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Coralie Raffin. Bases biologiques et écologiques de la conservation du milieu marin en mer d'Iroise. Ecologie, Environnement. Université de Bretagne occidentale - Brest, 2003. Français. ⟨tel-00005791⟩

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