Meiofauna communities' response to an anthropogenic pressure: The case study of green macroalgal bloom on sandy beach in Brittany - Archive ouverte HAL Access content directly
Journal Articles Estuarine, Coastal and Shelf Science Year : 2019

Meiofauna communities' response to an anthropogenic pressure: The case study of green macroalgal bloom on sandy beach in Brittany

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Abstract

Open sandy beaches support key ecological functions and a distinctive biodiversity, but are threatened by an increasing anthropogenic pressure. Among these threats is the occurrence of green tides of Ulva spp., expression of the eutrophication phenomenon. Our study aimed at determining the impact of green macroalgal accumulations on benthic meiofauna inhabiting two macrotidal sandy beaches of Brittany: Saint Nic (impacted) and Anse de Dinan (unimpacted). The presence of Ulva enhanced total meiofaunal abundance and nematode functional diversity when compared to a state free from macroalgal mats. The stranded Ulva supported high values of meiofaunal beta-diversity as well. This unexpected response was likely due to the highly dynamic nature of open sandy beaches that prevents O-2 depletion within sediments. Natural seasonal changes in meiofaunal biomass and composition were also evident at both beaches and changes in environmental features, apart from eutrophication alone, do drive the variability in meiofaunal biomass and nematodes diversity.
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hal-02622934 , version 1 (20-07-2022)

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Attribution - NonCommercial - CC BY 4.0

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Elisa Baldrighi, Jacques Grall, Nolwenn Quillien, Rita Carriço, Valentin Verdon, et al.. Meiofauna communities' response to an anthropogenic pressure: The case study of green macroalgal bloom on sandy beach in Brittany. Estuarine, Coastal and Shelf Science, 2019, 227, pp.1-14. ⟨10.1016/j.ecss.2019.106326⟩. ⟨hal-02622934⟩
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