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Trajectoires écologiques : Méthodes et applications. Un cas d'étude sur la conservation et les dynamiques taxonomique/fonctionnelle/trophique des assemblages benthiques de substrat meubles dans la baie de Saint-Brieuc (Manche occidentale, France)

Abstract : The objective of this thesis was to analyze taxonomic and functional dynamics of soft bottom benthic assemblages in the bay of Saint-Brieuc (Western English Channel, France) during the last decades, and to track spatio-temporal patterns in the intertidal benthic food web. To this end, considering that evolution and functioning of intertidal and subtidal benthic assemblages in the bay of Saint-Brieuc did resonate into broader ecological questions relative to the stability and variability of ecosystems, methodological developments in the field of trajectory analyses have been proposed to quantify, qualify and visualize ecological dynamics in different fields of ecology. These developments, resulting from cross-pollination between marine and terrestrial ecology fields, served local analysis in marine habitats and underlined contrasted results in intertidal and subtidal areas. In the intertidal zone, observed changes mainly reflect random population changes of structuring species in habitat under strong natural pressures, rather than specific changes of the community. Dynamics of only few species look under influence of green tides in some assemblages. On the opposite, in subtidal habitats, trajectory analyses indicate changes in the structure and distribution of benthic assemblages, with a homogenization of assemblages, and significant functional shifts. As in many comparable ecosystems, phytoplankton and microphytobenthos support the food webs within the different habitats. Results are discussed regarding their potential determinism and implications in conservative management and governance processes. Some potential directions are proposed, as the use of trajectory analysis for the reporting of ecological quality status, which imply implies to deal with the double challenge of the theoretical and practical definition of reference conditions and of conservation targets.
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Submitted on : Thursday, September 29, 2022 - 8:45:13 AM
Last modification on : Friday, September 30, 2022 - 4:00:53 AM

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Anthony Sturbois. Trajectoires écologiques : Méthodes et applications. Un cas d'étude sur la conservation et les dynamiques taxonomique/fonctionnelle/trophique des assemblages benthiques de substrat meubles dans la baie de Saint-Brieuc (Manche occidentale, France). Ecology, environment. Université de Bretagne occidentale - Brest, 2021. English. ⟨NNT : 2021BRES0106⟩. ⟨tel-03791137⟩

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