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Article dans une revue

Distribution of live benthic foraminifera in the Ría de Vigo (NW Spain)

Paula Diz 1 Guillermo Francés
1 LPG-ANGERS - Laboratoire de Planétologie et Géodynamique - Angers
LPG - Laboratoire de Planétologie et Géodynamique [UMR 6112]
Abstract :

The spatial and vertical distributions of live benthic foraminifera from the muddy central axis of the Ría de Vigo were examined under downwelling and upwelling conditions. The spatial distribution of the main benthic foraminiferal species is controlled by salinity variations (San Simón Assemblage), food availability (Outer Ría Assemblage) and oxygen concentrations and/or reducing microenvironmental conditions in the sediment (Inner Ría Assemblage).The microhabitat distribution of benthic foraminifera is mainly dependant on the oxygenation/redox conditions in the sediment and the vertical segregation of food. In the inner areas of the ría, low oxygen and/or reducing microenvironmental conditions prevent the vertical segregation of microhabitats. In outer areas oxygen penetration is deep but microhabitat partitioning only occurs in the presence of additional food resources (mainly fresh organic carbon from phytoplankton blooms) which triggers the colonisation of the surface layer by new species and the migration upwards and reproduction of opportunistic species.

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https://hal.univ-angers.fr/hal-03278019
Contributeur : Okina Université d'Angers <>
Soumis le : lundi 5 juillet 2021 - 12:00:53
Dernière modification le : mardi 6 juillet 2021 - 03:44:57

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Paula Diz, Guillermo Francés. Distribution of live benthic foraminifera in the Ría de Vigo (NW Spain). Marine Micropaleontology, Elsevier, 2008, 66 (3–4), pp.165 - 191. ⟨10.1016/j.marmicro.2007.09.001⟩. ⟨hal-03278019⟩

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