Job Researcher in Life Sciences, phytoplankton ecology
Discipline Life Sciences
Speciality areas Ecology, phytoplankton
Contract type Post-doctoral contract
Département ODE, Océanographie et Dynamique des Écosystèmes
Unité DYNECO, DYNamiques des Ecosystèmes CÔtiers/Laboratoire PELAGOS, Écologie Pélagique.
Duty station Centre Bretagne, Plouzané (France)
Reference (HRD) PV-2020-777/1
A pioneer in ocean science, IFREMER’s cutting-edge research is grounded in sustainable development and open science. Our vision is to advance science, expertise and innovation to:
- Protect and restore the ocean
- Sustainably use marine resources to benefit society
- Create and share ocean data, information & knowledge.
With more than 1,500 personnel spread along the French coastline in more than 20 sites, the Institute explores the 3 great oceans: the Indian, Atlantic and Pacific oceans. A leader in ocean science, IFREMER is managing the French Oceanographic Fleet and its dedicated scientists create ground-breaking technology to push the boundaries of ocean exploration and knowledge, from the abyss to the atmosphere-ocean interface.
Well-established in the international scientific community, our scientists, engineers and technicians are committed to advance knowledge about our planet’s last unexplored frontiers. They provide the science we need for informed decision-making and public policy and they transfer this knowledge and technology to businesses to fulfill public and private needs. Core to our mission is also to strengthen public awareness about the importance of understanding the ocean and its resources, and empowering future generations of leaders through education and outreach national campaigns.
Founded in 1984, IFREMER is a French public organization and its budget approximates 240 million euros. It is operating under the joint authority of the French Ministry for Higher Education, Research and Innovation, the French Ministry for the Ecological and Solidary Transition, and the French Ministry of Agriculture and Food.
The main objective of DYNECO unit (Coastal Ecosystems Dynamics) is to study the response of coastal ecosystems to anthropogenic and natural pressures. The general approach is to analyse physical and biogeochemical processes driving the ecosystem and to set up an integrative approach based on experimentation, in situ observation and modelling. The main research axes are focused on i) dissolved and particulate matter fluxes in coastal ecosystems, ii) diversity, functioning and becoming of communities and biotopes and iii) disturbances at population scale.
Being part of DYNECO unit, Pelagos laboratory has for objective to study the coastal pelagic ecosystem, and particularly, nutrient and plankton cycles and their responses to anthropogenic activities (e.g. harmful algae). Pelagos lab is involved in the execution of the Directive Cadre sur l’Eau (DCE) and the Directive Cadre Stratégie pour le Milieu Marin (DCSMM) for hydrology and phytoplankton. It integrates several and additional lab competencies (i.e. chemistry, taxonomy, phytoplankton genetic and ecophysiology), as well as satellite detection, modelling and instrumentation.
The excessive proliferation of some phytoplankton species can cause major perturbations to the ecosystem that can be due to toxic algae or high biomass generating anoxia. Period of high extent of Alexandrium minutum, for example, has been observed in the Bay of Brest in 2012, in the Bay of Morlaix, in the estuaries of Penzé and Rance rivers in 1990s. A. minutum, as the majority of toxic dinoflagellates, is mixotrophic presenting the dual capability to do phototrophy (i.e. photosynthesis) and phagotrophy (i.e. ingestion and digestion of an organism or other exogeneous particles) in the same cell. Although it is well known that A. minutum is a phytoplankton mixotrophic, a lack of information remains on the estimation of the relative part of nutritional modes as energy source for this species, in order to better understand the apparition of its proliferation and understand the effect of environmental factors on its nutritional modes and so its growth. This present project aims to study the importance of the phagotrophy of A. minutum under different environmental conditions as light limitation and nutrient stress.
For that, we expect to run lab experiments in order to quantify the contribution of phototrophy and phagotrophy of A. minutum combining different substrates and prey sources. During this project, we propose to quantify the phagotrophy rates of A. minutum from bacteria presents in A. minutum cultures but also from cyanobacteria as Synechococcus relative to different environmental conditions (e.g. light limitation, temperature, nutritive stress and their co-limitations). In parallel, prey ingestion rates (Sherr et al. 1987) will be estimated as well as the percentage of organisms actively feeding (Carvalho and Graneli 2006).
Furthermore, additional experiments will be done in situ during spring-summer blooms of A. minutum in the Bay of Brest (France). During these experiments, bacterivory (Zubkov et al. 2008, Hartmann et al. 2012) and prey ingestion rates will be determined as well as the percentage of organisms actively feeding.
He/she will be in charge of the phagotrophy experiments (lab and field) that is setting up and designing the experiments, managing the phytoplankton cultures and analysing the data. If necessary, the postdoctoral researcher would be in charge of a Master student to help with the experiments and analyses.
The postdoctoral researcher will:
The candidate must have his/her PhD thesis in marine biology oor oceanography and must have work (research field) at least 18 months in other country/ies than France from May 1rst 2016 to the date of which the postdoc contract will start.
- strong knowledge in marine phytoplankton ecology and ecophysiology, on planktonic biological interactions and stress drivers. Knowledge in molecular biology would be appreciated
- technical skills in epifluorescence microscopy, flow cytometry, phytoplankton cultures, capacities to work with radio-elements (3H3, 35S and 14C), field work
- communication skills: strong redaction capacities, capacities in transposing results in English, fully autonomy in redacting scientific paper, good aptitude and motivation to work in a team
- Good sense of organization, scientific rigor, initiative spirit
- good communications skills, good relational and working on a team
- Good knowledge of scientific English
Deadline for applications: October 6th, 2020
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|Titel||PostDoc research on phytoplankton ecology|
|Employer||Ifremer - French Research Institute for Exploitation of the Sea|
|Job location||155 Rue Jean Jacques Rousseau, 92138 Issy-les-Moulineaux|
|Veröffentlicht||September 15, 2020|
|Bewerbungsschluss||Oktober 6, 2020|
|Jobart||Post Doc  |
|Fachbereiche||Ökologie,   Ozeanografie,   Biochemie,   Molekularbiologie,   Genetik,   Meeresbiologie,   Geochemie  |