PALEVOPRIM
UMR 7262 CNRS & UP

Laboratoire Paléontologie
Evolution Paléoécosystèmes
Paléoprimatologie
Université de Poitiers

23 janvier 2020 à 13h30 : déjeuner scientifique

Intervenante

Axelle ZACAÏ
Postdoctorante

Thème

« Phytoplankton biogeography in the early Palaeozoic: spatial distribution of diversity and control factor »

The latitudinal diversity gradient (LDG) – the decrease in species number from the equator to the poles – is considered as the most pervasive large-scale biological pattern on Earth, but the timing of its establishment, its ubiquity in the geological past and explanatory mechanisms remain uncertain. In this study, we show that acritarchs – the first representatives of marine phytoplankton in the fossil record – exhibited a LDG as early as the beginning of the Cambrian, when most major marine phyla appeared. However, this LDG was atypical, showing a single peak of diversity in the Southern and not in the Northern Hemisphere. Our findings suggest that variation of this LDG through time resulted from both annual sea-surface temperature and long-term climate fluctuations.

Lieu

Salle 410, bât. B35 (3ème étage, aile nord), Université de Poitiers.

Consulter toutes les actus
2020-02-04T13:32:41+00:00

GESTIONNAIRES

Laure PAINAULT
laure.painault@univ-poitiers.fr
Tél. : +33 (0)5 49 45 37 53

Guylaine REYNAUD
guylaine.reynaud@univ-poitiers.fr

Tél. : +33 (0)5 49 45 37 26

Fax : +33.(0)5 49 45 40 17

ADRESSE POSTALE

Université de Poitiers – UFR SFA

PALEVOPRIM UMR CNRS 7262

Bât B35 – TSA 51106

6 rue Michel Brunet

86073 POITIERS Cedex 9