Constance ChoquelAix-Marseille Université | AMU · Centre d'Océanologie de Marseille
Assistant lecturer in Marine Ecology at the Mediterranean Institute of Oceanography (MIO)
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My ongoing post-doctoral research focuses to generate geological records based on subpolar calcifying organisms (foraminifera), documenting the responses of environmental and climate changes during times of rapid warming, deoxygenation, and pH decrease by analyzing biogenic calcite samples. I will use a combination of synchrotron X-ray µCT scan, µXRF, and plasma-based elemental analyses.
Human activities in coastal areas have intensified over the last 200 years, impacting also high-latitude regions such as the Baltic Sea. Benthic foraminifera, protists often with calcite shells (tests), are typically well preserved in marine sediments and known to record past bottom-water conditions. Morphological analyses of marine shells acquired...
In mudflats, interactions and transfers of nutrients and secondary metabolites may drive ecosystems and biodiversity. Foraminifera have complex trophic strategies as they often rely on bacteria and eukaryotes or on potential symbionts for carbon and nitrogen resources. The capacity of these protists to use a wide range of adaptive mechanisms requir...
Coastal environments are exposed to numerous pressures that potentially affect marine soft bottom faunas. Among these pressures, organic matter enrichment is very frequent. Several indices based on living (Rose Bengal-stained) foraminiferal communities have recently been developed to assess the induced impact and determine the environmental quality...
The overall aim of this PhD thesis was to investigate sedimentary micro-environments and ecosystem functioning of two coastal areas. We combined different high spatial resolution methods and multivariate analyses at different spatio-temporal scales to reveal interactions between benthic faunal and geochemical compartments. Firstly, we investigated...
Oxygen and nitrate availabilities impact the marine nitrogen cycle at a range of spatial and temporal scales. Here, we demonstrate the impact of denitrifying foraminifera on the nitrogen cycle at two oxygen and nitrate contrasting stations in a fjord environment (Gullmar Fjord, Sweden). Denitrification by benthic foraminifera was determined through...
Oxygen availability impacts the marine nitrogen cycle at a range of spatial and temporal scales. Invasive organisms have shown to sustainably affect sediment geochemistry and benthic ecology. Nonionella sp. T1 was recently described as an invasive benthic foraminifer in the North Sea region. Here, we demonstrate the impact of this denitrifying spec...
Benthic manganese cycle studied with 2D high spatial resolution methods at contrasted oxygen conditions in Gullmar Fjord (Sweden)