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L'évaluation des besoins de conservation d'un patrimoine naturel littoral marin. L'exemple des estrans meubles de l'archipel de Chausey.

Abstract : The intention of conserving the marine littoral biodiversity appeared following the awareness of its high vul-nerability. In the current context of the sixth extinction, conservation biologists mainly focus on rich, rare, and vulnerable elements. But is it not a fight against the “tip of iceberg” of the biodiversity crisis? Do the common marine littoral habitats not represent a conservation stake as well? To answer this question, we explore the conservation needs of the soft-bottom benthic intertidal habitats of the Chausey archipelago (Normand-Breton Gulf). The highlighting of 180 years of naturalist testimonies, marvellous reference state of the natural heritage of the site and its perception along two centuries, as well as the development and the application of a new me-thod allowing to map, monitor and describe accurately each benthic habitat, reveal the extreme complexity of this archipelago which includes almost all the soft-bottom benthic intertidal habitats of the north-western Europe. Of these habitats, few benefit from conservation measures. However, through the example of the Lanice con-chilega beds, we underline the high conservation need of an ordinary habitat, which is a priori non-vulnerable and almost impossible to conserve because of its huge distribution. In Chausey, this habitat represents an impor-tant conservation need both from a biological and a socioeconomic point of view. In addition, it is threatened by shellfish farming which negatively impacts its associated benthic macrofaunal assemblage and its attractive nature for shorebirds. The conservation needs of each habitat are then evaluated through stakes (what is affected if a habitat disappears), hazards (extinction risk) and conservation possibilities, through an interdisciplinary approach combining ecology, geography, and history. The combination of these criteria highlights a diversity of conservation needs which can be generalized to a wide range of other marine littoral habitats of the temperate coasts.
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https://tel.archives-ouvertes.fr/tel-00275244
Contributor : Laurent Godet Connect in order to contact the contributor
Submitted on : Tuesday, April 22, 2008 - 10:37:52 PM
Last modification on : Thursday, March 17, 2022 - 2:00:06 PM
Long-term archiving on: : Friday, May 28, 2010 - 5:07:10 PM

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  • HAL Id : tel-00275244, version 1

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Laurent Godet. L'évaluation des besoins de conservation d'un patrimoine naturel littoral marin. L'exemple des estrans meubles de l'archipel de Chausey.. domain_other. Museum national d'histoire naturelle - MNHN PARIS, 2008. Français. ⟨tel-00275244⟩

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