Person
Charlotte Madeleine Nicole Lekieffre
This person is no longer with EPFL
Related publications (24)
Kleptoplast distribution, photosynthetic efficiency and sequestration mechanisms in intertidal benthic foraminifera
Anders Meibom, Charlotte Madeleine Nicole Lekieffre, Emmanuelle Geslin, Michael Kühl
Foraminifera are ubiquitously distributed in marine habitats, playing a major role in marine sediment carbon sequestration and the nitrogen cycle. They exhibit a wide diversity of feeding and behavioural strategies (heterotrophy, autotrophy and mixotrophy) ...
SPRINGERNATURE2021Ammonium is the preferred source of nitrogen for planktonic foraminifer and their dinoflagellate symbionts
Anders Meibom, Charlotte Madeleine Nicole Lekieffre, Emmanuelle Geslin
The symbiotic planktonic foraminiferaOrbulina universainhabits open ocean oligotrophic ecosystems where dissolved nutrients are scarce and often limit biological productivity. It has previously been proposed thatO. universameets its nitrogen (N) requiremen ...
ROYAL SOC2020Heterotrophic Foraminifera Capable of Inorganic Nitrogen Assimilation
Anders Meibom, Charlotte Madeleine Nicole Lekieffre, Emmanuelle Geslin
Nitrogen availability often limits biological productivity in marine systems, where inorganic nitrogen, such as ammonium is assimilated into the food web by bacteria and photoautotrophic eukaryotes. Recently, ammonium assimilation was observed in kleptopla ...
FRONTIERS MEDIA SA2020Functional kleptoplasts intermediate incorporation of carbon and nitrogen in cells of the Sacoglossa sea slug Elysia viridis
Anders Meibom, Stéphane Laurent Escrig, Charlotte Madeleine Nicole Lekieffre, Michael Kühl
Some sacoglossan sea slugs incorporate intracellular functional algal chloroplasts, a process termed kleptoplasty. "Stolen" chloroplasts (kleptoplasts) can remain photosynthetically active up to several months, contributing to animal nutrition. Whether thi ...
NATURE PUBLISHING GROUP2020Kleptoplastidic benthic foraminifera from aphotic habitats: insights into assimilation of inorganic C, N and S studied with sub-cellular resolution
Anders Meibom, Charlotte Madeleine Nicole Lekieffre, Emmanuelle Geslin
The assimilation of inorganic compounds in foraminiferal metabolism compared to predation or organic matter assimilation is unknown. Here, we investigate possible inorganic-compound assimilation in Nonionellina labradorica, a common kleptoplastidic benthic ...
WILEY2019Cellular ultrastructure in benthic foraminifera: general observations and focus on kleptoplasts.
Anders Meibom, Charlotte Madeleine Nicole Lekieffre, Emmanuelle Geslin
Research of the past few decades has revealed a great variability of metabolisms (e.g. adaptation to different microhabitats, feeding strategies, symbiosis, survival to stressful conditions) among benthic foraminiferal species. This metabolic variety is re ...
2018An overview of cellular ultrastructure in benthic foraminifera: New observations of rotalid species in the context of existing literature
Anders Meibom, Charlotte Madeleine Nicole Lekieffre, Emmanuelle Geslin
We report systematic transmission electron microscope (TEM) observations of the cellular ultrastructure of selected, small rotalid benthic foraminifera. Nine species from different environments (intertidal mudflat, fjord, and basin) were investigated: Ammo ...
2018Ultrastructure and distribution of kleptoplasts in benthic foraminifera from shallow-water (photic) habitats
Anders Meibom, Charlotte Madeleine Nicole Lekieffre, Emmanuelle Geslin
Assimilation, sequestration and maintenance of foreign chloroplasts inside an organism is termed “chloroplast sequestration” or “kleptoplasty”. This phenomenon is known in certain benthic foraminifera, in which such kleptoplasts can be found both intact an ...
2018Kleptoplastidic benthic foraminifera from aphotic habitats: Assimilation (or not) of inorganic C, N, and S studied at sub-cellular resolution
Anders Meibom, Charlotte Madeleine Nicole Lekieffre, Emmanuelle Geslin
The assimilation of inorganic compounds and their role in the foraminiferal metabolism compared to predation or organic matter assimilation is unknown. Here we investigate these processes with a study of the species Nonionellina labradorica (Dawson, 1860), ...
2018Innovative TEM-coupled approaches to study foraminiferal cells
Anders Meibom, Stéphane Laurent Escrig, Charlotte Madeleine Nicole Lekieffre, Emmanuelle Geslin
Transmission electron microscope (TEM) observation has revealed much about the basic cell biology of foraminifera. Yet, there remains much we do not know about foraminiferal cytology and physiology, especially for smaller benthic foraminifera, which inhabi ...
2018