Guest Lecture: Aniket Mitra

Revisiting Paleogene through the migration pattern of Bivalvia

Aniket Mitra received his Ph.D. (2023) from Presidency University, India. He is currently Marie Skolodowska/EUTOPIA-SIF postdoctoral fellow at CY Cergy Paris University, hosted by the laboratory GEC.

Bivalves spend juvenile larval stage of their life suspended in the water column. So, they are susceptible to disperse from one place to another with water current. The rest of their life is spent in one of four modes: burrowing, boring, cementing, or lying freely. As oceanic current is influenced by climate and tectonic changes thus any major geologic events are critical for migration of bivalve larvae through time.
Paleogene period, which lasted around 66Ma to 23Ma ago from now, witnessed a wide spectrum of geologic events ranging from Himalaya and Alps orogenesis, closure of the Tethys Sea, global warming, sea level fluctuations, Antarctic glaciation and global cooling. Palaeobiogeographic distribution pattern of marine bivalves have been analysed to see the effect of these above-mentioned events on the migration of bivalves. During the early Paleogene hyperthermal, shallow shelves in the northern hemisphere's temperate and equatorial zones witnessed an influx of new bivalve genera. They started to migrate to higher latitudes with increasing temperature. Northern equatorial current facilitated a strong generic similarity from east to west of Tethys, which was affected strongly due to Himalaya and Alps orogenesis and finally closure of the Tethys. Global cooling in the late Paleogene had much more adverse effect on the bivalve community. Not only a opposite migratory flow has been witnessed from higher to lower latitudes but also generic diversity was jeopardised to a large extent.

Date! Tuesday 19 March 2024 from 14:00 to 15:30

The hybrid guest lecture is organised in person at the H008 meeting room of MIR in Neuville-sur-Oise and remotely on Zoom.

To attend the remote guest lecture, please connect to Zoom: https://cyu-fr.zoom.us/j/95833994431
Meeting ID: 958 3399 4431

The video will be online on the CY AS YouTube channel