MORELLE, Jérôme; MAIRE, Olivier; RICHARD, Anais; SLIMANI, Alex; ORVAIN, Francis

doi:10.1016/j.marenvres.2020.105228

Environnements et Paléoenvironnements OCéaniques [EPOC]

RICHARD, Anais

Environnements et Paléoenvironnements OCéaniques [EPOC]

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Article de revue

Ce document a été publié dans

Marine Environmental Research. 2021-01-01, vol. 163

Résumé en anglais

Microphytobenthos is most often the primary source of carbon for coastal soft-sediment communities, especially in intertidal and shallow subtidal environments. The influence of benthic macrofaunal organisms on microphytobenthic biomass, spatial distribution and photosynthetic capacities is not only resulting from their feeding intensity but also indirectly from their bioturbation activity, which regulates nutrient fluxes and sediment mixing. This study compares the impact of two species (Hediste diversicolor and Scrobicularia plana) that dominate macrofaunal communities in estuarine intertidal mudflats on microphytobenthic biomass and photosynthetic activity. Imaging-PAM fluorescence was used to non-invasively map the development of microphytobenthic biomass and to assess its spatial extent. Our results showed that, due to intense deposit feeding, Scrobicularia plana quickly limited microphytobenthos growth and photosynthetic activity, even at low density (<250 ind m−2). In contrast, the negative impact of Hediste diversicolor on microphytobenthos development due to direct consumption was very low. Thereby, the stimulation of nutrient fluxes at the sediment-water interface resulting from bioirrigation seems to enhance microphytobenthos growth and photosynthesis. © 2020 Elsevier Ltd< Réduire

Mots clés en anglais

Imaging-PAM

macrofauna

microphytobenthos

spatial distribution

photosynthesis

URI

https://oskar-bordeaux.fr/handle/20.500.12278/186391

DOI

http://dx.doi.org/10.1016/j.marenvres.2020.105228

Unités de recherche

EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805

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Contrasted impact of two macrofaunal species (Hediste diversicolor and Scrobicularia plana) on microphytobenthos spatial distribution and photosynthetic activity at microscale

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Ce document a été publié dans

Résumé en anglais

Mots clés en anglais

URI

DOI

Unités de recherche