CalcOBISCalcOBIS CalcOBIS - « Calcareous Plankton Ocean Biogeographic Information System »...

CalcOBIS

CalcOBIS - « Calcareous Plankton Ocean Biogeographic Information System »Colomban de Vargas et Thibault de Garidel Thoron

http://marine.rutgers.edu/CALCOBIS/

Cartes biogéographiques basées sur les données fossiles, morphologiques, et ADN. Phylogénie et stratigraphie sont également présentées pour chaque espèce.

Analyses morpho-génétiques sur cellules iolées:le protocole GITC*

Le protocoleGITC* :

Sur le terrain Au laboratoire

TypeGéné-tique ISubtropical

Type IIIZone frontale subtropicale

Type IVZone frontale polaire

Conclusions …

Single-Cell PCR/RFLP analyses allow cheap and rapid processingof a high number of samples collected over large geographicand temporal scales in the pelagic realm.The molecular biogeographic patterns are relatively simpleand stable between basins.

Cosmopolitan, globally distributed species with extremelyhigh ecological/genetic plasticity do not seem to exist in the plankton.

They are in fact monophyletic groups of sister specieshaving specific, and often allopatric biogeographic ranges.

There is a significant decoupling between morphologic and geneticdifferentiations in both foraminifers and coccolithophores.

Simple spatio-temporal disconnection betweenThe morphological and genetic/ecologicdifferentiations

Actively ongoing process of creation/extinctionof biological species with different ecologicalranges.

Intégration au sein de l’UMR 7127, Station Biologique de Roscoff

Equipe PLANCTON OCEANIQUE (responsable: Daniel Vaulot):