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Les habitats rocheux intertidaux sous l'influence d'activités anthropiques : structure, dynamique et enjeux de conservation

Abstract : Recreational and professional activities are intensifying on the rocky intertidal. The overturning of boulders and the trampling associated with human activities, have consequences on the structure and dynamic of rocky intertidal communities. Through the identification of species and descriptors that respond more to the disturbances “trampling of mediolittoral rock platforms” and “the overturning of low eulittoral boulders by hand-fishermen”, SMART indicators (Simple, Measurable, Achievable, Realistic, and Time limited indicator) can be created for the assessment of the conservation status of these habitats. The effects of trampling were tested with control approach. Experiments in situ underlined very complex interactions between species during the ecological processes of degradation of biocenoses. High thresholds of disturbance were also observed. They were particularly related to the protection played by structuring brown algae on other species. The study of boulder’s overturning highlighted a step of almost total mortality of fixed or low mobile organisms that live on upper or lower surfaces of boulders. Results also showed a low resilience of the habitat. The use of appropriate reference situations and of the most sensitive species to the boulder’s overturning, led to the creation of two ecological indicators. Declined to two different spatial scales, they may be applied routinely by scientists and managers of marine protected areas.
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Submitted on : Monday, January 28, 2013 - 3:33:40 PM
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  • HAL Id : tel-00720611, version 2



Maud Bernard. Les habitats rocheux intertidaux sous l'influence d'activités anthropiques : structure, dynamique et enjeux de conservation. Sciences agricoles. Université de Bretagne occidentale - Brest, 2012. Français. ⟨NNT : 2012BRES0010⟩. ⟨tel-00720611v2⟩



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