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Can molluscan assemblages give insights into Holocene environmental changes other than sea level rise? A case study from a macrotidal bay (Marennes-Oleron, France) ArchiMer
Poirier, Clement; Sauriau, Pierre-guy; Chaumillon, Eric; Allard, Jonathan.
During the Late Holocene, the rate of sea level rise decreased and climate changes, hydrodynamic processes or anthropogenic impacts became predominant parameters governing the sedimentary infill of estuarine environments. The aim of this study is to describe the response of past benthic mollusc communities to these forcing factors. Mollusc skeletal remains were sampled from three 8000, 5500 and 2600 year-long sedimentary records in the Marennes-Oleron Bay (Atlantic Coast, France), where environmental changes have previously been identified thanks to a combination of very high resolution seismic profiles and sedimentological data. Molluscan assemblages successfully record environmental changes, even at the smallest temporal scale. They provide relevant...
Tipo: Text Palavras-chave: Atlantic Coast; Sediment core; Palaeoenvironment; Death assemblage; Macrofauna.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6833.pdf
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Influence of hydro-sedimentary factors on mollusc death assemblages in a temperate mixed tide-and-wave dominated coastal environment: Implications for the fossil record ArchiMer
Poirier, Clement; Sauriau, Pierre-guy; Chaumillon, Eric; Bertin, Xavier.
Mollusc death assemblages were recovered in 98 subtidal sampling stations on the seafloor of the shallow Pertuis Charentais Sea (Atlantic coast of France). Taxonomic composition and spatial distribution of death assemblages were investigated, as well as their response to sediment grain size (field data), bottom shear stress (coupled tide and wave hydrodynamic modelling), and sediment budget (bathymetric difference map) Results showed that molluscs are likely to be reliable paleoenvironmental indicators since death assemblages were able to acquire ecological changes within years (decadal-scale taphonomic inertia), and live-dead agreement inferred from existing data on living benthic communities was high, except close to river mouths and intertidal mudflats...
Tipo: Text Palavras-chave: Benthos; Estuary; Holocene; Paleoecology; Sediment budget; Taphonomy.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00017/12814/10260.pdf
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