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Charlotte Madeleine Nicole Lekieffre
This person is no longer with EPFL
Related publications (24)
Cellular pathways of carbon and nitrogen assimilation in kleptoplastic foraminiferal species
Anders Meibom, Charlotte Madeleine Nicole Lekieffre, Emmanuelle Geslin
Kleptoplasty is the process by which an organism sequesters algal chloroplasts while discarding or digesting other algal components. This ability is encountered in different organisms, including benthic foraminifera. Among kleptoplastic foraminiferal speci ...
2018Assimilation, translocation, and utilization of carbon between photosynthetic symbiotic dinoflagellates and their planktic foraminifera host
Anders Meibom, Charlotte Madeleine Nicole Lekieffre, Emmanuelle Geslin
Some species of planktic foraminifera inhabiting oligotrophic surface water environments are in an obligate symbiotic relationship with dinoflagellate microalgae, which can assimilate carbon (C) through photosynthesis. However, the mechanism and dynamics o ...
2018Inorganic carbon and nitrogen assimilation in cellular compartments of a benthic kleptoplastic foraminifer
Anders Meibom, Charlotte Madeleine Nicole Lekieffre, Emmanuelle Geslin, Maria-Evangelia Giovani
Haynesina germanica, an ubiquitous benthic foraminifer in intertidal mudflats, has the remarkable ability to isolate, sequester, and use chloroplasts from microalgae. The photosynthetic functionality of these kleptoplasts has been demonstrated by measuring ...
2018Correlated TEM-NanoSIMS investigation of foraminiferal metabolism
Charlotte Madeleine Nicole Lekieffre
Foraminifera are ubiquitous eukaryotic protists inhabiting all types of marine environments. The chemical and isotopic compositions of their carbonate tests are commonly used as proxies for paleo-environmental conditions. However, while foraminifera repres ...
EPFL2017Surviving anoxia in marine sediments: The metabolic response of ubiquitous benthic foraminifera (Ammonia tepida)
Anders Meibom, Stéphane Laurent Escrig, Charlotte Madeleine Nicole Lekieffre, Emmanuelle Geslin
High input of organic carbon and/or slowly renewing bottom waters frequently create periods with low dissolved oxygen concentrations on continental shelves and in coastal areas; such events can have strong impacts on benthic ecosystems. Among the meiofauna ...
Public Library of Science2017Sequestered Chloroplasts In The Benthic Foraminifer Haynesina Germanica: Cellular Organization, Oxygen Fluxes And Potential Ecological Implications
Charlotte Madeleine Nicole Lekieffre, Emmanuelle Geslin
Haynesina germanica is a coastal benthic foraminifer known to sequester chloroplasts from benthic pennate diatoms. This study investigates its cellular organization, as well as the oxygen consumption and production rates under dark and light conditions. Th ...
2017A benthic foraminifera species respond to anoxia with a strong metabolic shift suggesting a state of dormancy
Anders Meibom, Charlotte Madeleine Nicole Lekieffre, Emmanuelle Geslin
Low-oxygenation events are more and more frequent and strong on continental shelves and in coastal areas where renewal of bottom waters is slow. Among the meiofauna living in such environments, foraminifera are among the most tolerant to the lack of oxygen ...
2016Dormant or not dormant? Benthic foraminiferal metabolism under anoxia
Anders Meibom, Charlotte Madeleine Nicole Lekieffre, Emmanuelle Geslin
Hypoxic events particularly affect benthic ecosystems on continental shelves and in coastal areas where renewal of bottom waters slow. Foraminifera living in such environments are among the most tolerant to hypoxia in the meiofauna. Some foraminifera speci ...
2016Kleptoplasty in a shallow water benthic foraminifer, Haynesina germanica
Anders Meibom, Charlotte Madeleine Nicole Lekieffre, Emmanuelle Geslin
Some benthic foraminifera have the ability to incorporate functional chloroplasts from diatoms (kleptoplasty). Our objective was to investigate kleptoplast cellular organisation, functionality (O2 flux, C and N incorporation), pigment composition and photo ...
2016NanoSIMS applied to the study of foraminifera
Anders Meibom, Stéphane Laurent Escrig, Charlotte Madeleine Nicole Lekieffre, Emmanuelle Geslin
NanoSIMS (Nanoscale Secondary-Ion Mass Spectrometry) is a powerful analytical technique that allows quantitative, subcellular imaging of incorporation and transfer of isotopically labeled compounds and metabolites in biological tissue (Hoppe et al., 2013). ...
2016