Julie Meilland

Julie Meilland
MARUM Center for Marine Environmental Sciences

PhD

About

30
Publications
8,103
Reads
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293
Citations
Introduction
I am a marine biologist and chemist with interest in the ecology of modern planktic foraminifera. A particular focus of my research is the quantification of living planktonic foraminifera impact to the marine biological Carbon pump. My research combines the ecology of individual planktic foraminifera with the physico-chemistry of their surrounding environment. This environment influences their growth rate, biomass, living depth as well as their shell composition. In order to fully unlock foraminifera potential as proxy for climate reconstruction, it is essential to understand how they evolve in their surrounding environment.
Additional affiliations
October 2017 - present
MARUM Center for Marine Environmental Sciences
Position
  • PostDoc Position
January 2016 - November 2016
UiT The Arctic University of Norway
Position
  • PostDoc Position
October 2012 - November 2015
University of Angers
Position
  • PhD Student

Publications

Publications (30)
Preprint
Full-text available
The hydrological cycle is expected to intensify in a warming climate. However, observational evidence of such changes in the Southern Ocean is difficult to obtain due to sparse measurements and a complex superposition of changes in precipitation, sea ice, and glacial meltwater. We here disentangle these signals using a unique dataset of salinity an...
Article
Full-text available
Planktonic Foraminifera are ubiquitous marine protozoa inhabiting the upper ocean. During life, they secrete calcareous shells, which accumulate in marine sediments, providing a geological record of past spatial and temporal changes in their community structure. As a result, they provide the opportunity to analyze both current and historical patter...
Preprint
Full-text available
With ongoing warming and sea ice loss, the Arctic Ocean and its marginal seas will likely become more hospitable to pelagic calcifiers, resulting in modifications of the regional carbonate cycle and the composition of the seafloor sediment. A substantial part of the pelagic carbonate production in the Arctic is due to the calcification of the domin...
Article
Full-text available
Individual foraminifera analysis (IFA) holds promise to reconstruct seasonal to interannual oceanographic variability. Even though planktonic foraminifera are reliable recorders of environmental conditions on a population level, whether they also are on the level of individuals is unknown. Yet, one of the main assumptions underlying IFA is that eac...
Article
Full-text available
Planktonic foraminifera are a prolific and diverse group of Rhizaria, inhabiting the upper water column in all marine habitats. In the course of their evolution, different clades of the foraminifera colonized the plankton, making the fossil and extant planktonic foraminifera an ecological group rather than a clade with a single monophyletic origin....
Article
Full-text available
It has long been assumed that the population dynamics of planktonic foraminifera is characterised by synchronous reproduction associated with ontogenetic vertical migration. However, due to contradictory observations, this concept became controversial, and subsequent studies provided evidence both in favour and against these phenomena. Here we pres...
Article
Full-text available
Planktic foraminfera and shelled pteropods are important calcifying groups of pelagic fauna in all oceans. Their calcium carbonate shells are sensitive to changes in ocean carbonate chemistry predisposing them as an important indicator of ocean acidification. Moreover, planktic foraminfera and shelled pteropods contribute significantly to food webs...
Preprint
Full-text available
It has long been assumed that the population dynamics of planktonic foraminifera is characterised by synchronous reproduction associated with ontogenetic vertical migration. However, due to contradictory observations, this concept became controversial and subsequent studies provided evidence both in favor and against these phenomena. Here we presen...
Preprint
Full-text available
Individual foraminifera analysis (IFA) holds promise to reconstruct seasonal to interannual oceanographic variability. Even though planktonic foraminifera are reliable recorders of environmental conditions on a population level, whether they also are on the level of individuals is unknown. Yet, one of the main assumptions underlying IFA is that eac...
Article
Full-text available
Marine zooplankton time series are crucial to understand the dynamics of pelagic ecosystems. However, most observational time series are only a few decades long, which limits our understanding of long-term zooplankton dynamics, renders attribution of observed trends to global change ambiguous, and hampers prediction of future response to environmen...
Article
Full-text available
Planktic foraminifera and shelled pteropods are some of the major producers of calcium carbonate (CaCO 3 ) in the ocean. Their calcitic (foraminifera) and aragonitic (pteropods) shells are particularly sensitive to changes in the carbonate chemistry and play an important role for the inorganic and organic carbon pump of the ocean. Here, we have stu...
Article
Full-text available
To better understand production, succession, excystment and transport of dinoflagellate cysts (dinocysts) and planktonic foraminifera in the upper water column, we investigated their fluxes during a 7-day survey in the active upwelling off Cape Blanc (NW Africa) in November 2018 with drifting traps at 100 m, 200 m and 400 m water depth. The survey...
Article
Full-text available
Chemical signatures in the calcite of shells of polar and subpolar planktonic foraminifera have been frequently used to trace and quantify past meltwater discharge events. This approach assumes that the foraminifera can tolerate low salinity under extended periods. To obtain a first experimental constraint on salinity tolerance of Subarctic foramin...
Article
Full-text available
This study reports on diversity and distribution of planktonic foraminifera (PF) in the Barents Sea Opening (BSO). Populations of PF living in late summer (collected by means of stratified plankton tows) and recently deposited individuals (sampled by interface corer) were compared. High abundances reaching up to 400 ind.m-3 in tow samples and 8000...
Article
Full-text available
Planktonic foraminifera and the thecosome pteropod species Limacina helicina are microscopic organisms who live in the water column and build their shells out of calcium carbonate. Little is known about the planktonic foraminiferal faunas in the Barents Sea, and their seasonality in general. This study is the first on planktonic foraminifera and Li...
Preprint
Full-text available
Abstract. This study reports on species diversity and distribution of planktonic foraminifera (PF) at the Barents Sea Opening (BSO). PF populations living in late summer (collected by mean of stratified plankton tows) and recently settled individuals (sampled by interface corer) were studied and compared. High abundances reaching up to 400 ind.m<su...
Book
Full-text available
Cruise M140 combined sampling of plankton, mineral dust and other particles in the water column with recovery of data and samples from long-term observational platforms (sediment traps and dust-collecting buoys). The aim of the cruise was to provide new observations to improve our understanding of the ecology of planktonic foraminifera as important...
Article
Full-text available
Planktonic foraminiferal species identification is central to many paleoceanographic studies, from selecting species for geochemical research to elucidating the biotic dynamics of microfossil communities relevant to physical oceanographic processes and interconnected phenomena such as climate change. However, few resources exist to train students i...
Article
Full-text available
Diurnal vertical migration (DVM) is a widespread phenomenon in the upper ocean, but it remains unclear to what degree it also involves passively transported micro- and meso-zooplankton. These organisms are difficult to monitor by in situ sensing and observations from discrete samples are often inconclusive. Prime examples of such ambiguity are plan...
Article
Eight SSU rDNA genetic types have been described in the planktonic foraminifera Neogloboquadrina pachyderma, but the level of correlation between genetic diversity and morphological variation remains unknown in this morphospecies. In this study, we combine molecular and morphometric analyses of specimens of N. pachyderma sampled during two consecut...
Article
Planktonic foraminifer tests are major archives of environmental change and provide a multitude of proxies in paleoceanography and paleoclimatology. The application of such proxies is contingent upon a collaborative effort to better understand how the living organisms record the properties of their environment and how the resulting signals are reco...
Data
Research expedition M140 took place from August 11th, 2017 (Mindelo, Cabo Verde) to September 5th, 2017 (Las Palmas, Spain). CTD data for 16 stations with a total of 37 individual casts along the cruise track were recorded using a Sea & Sun Technology CTD90M (SN 979) down to depths of 700m. The CTD was equipped with the following sensors: Temperatu...
Article
Calcifying marine organisms include planktic foraminifers that contribute to the marine carbon turnover by generating inorganic carbon production (CaCO3, shell) and flux. In this study, we have analyzed assemblages at the morphospecies level and abundances of living planktic foraminifers (LPF) from ten stations located in the Southwest Indian Ocean...
Article
Planktic foraminifers can be sensitive indicators of the changing environment including both the Arctic Ocean and Southern Ocean. Due to variability in their ecology, biology, test characteristics, and fossil preservation in marine sediments, they serve as valuable archives in paleoceanography and climate geochemistry over the geologic time scale....
Article
Planktic foraminifers are ubiquitous marine mesozooplankton, and contribute to the biological carbon pump by generating organic and inorganic carbon flux. We have analyzed the morphometry and quantified the protein-biomass of the test (i.e. shell) of 1441 living planktic foraminifers from 19 stations sampled during three consecutive years (2012–201...
Thesis
Full-text available
Les foraminifères planctoniques vivants (LPF) contribuent à la pompe biologique du carbone océanique en générant des flux de Corg (cytoplasme) et de Cinorg (test calcaire). Dans cette étude, la morphométrie des tests, les abondances et les compositions spécifiques des assemblages de LPF dans l'océan Indien Sud (30°S-60°S, 50°E-80°E), ont été caract...

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Projects

Projects (2)
Project
FORCIS aims to evaluate the biodiversity changes of calcifying zooplankton in response to multiple stressors by building an ambitious database gathering planktonic foraminifera informations from the water column since the 40s! FORCIS is currently funded by the CESAB Fondation Recherche sur la Biodiversité, and received some support from the Labex OT-Med & the INSU. For more details please check the FORCIS' website.https://forcis.cerege.fr/
Project
The aim of the project is to better constrain living planktonic foraminifera vertical, horizontal distribution and depth habitat per species.