Joint Seminar: Modeling the impact of environmental variability on Black Sea anchovy overwintering migration

The anchovy is a small pelagic fish species that is well known for its thermophilic character (i.e. thrives at relatively higher temperatures). It is widely distributed in the temperate ocean and coastal areas. The Black Sea can be regarded as the northern inland geographical limit for anchovy. Anchovies are highly migratory. With the onset of initial cooling the Black Sea anchovy (Engraulis encrasicolus) undertake extensive (approx.1000 km) overwintering migrations every fall in the intense-eddy dominated system of Black Sea from nursery grounds to warmer overwintering areas located on the south-eastern coasts. Moreover, the Black Sea anchovy experiences high-frequency stock fluctuations and collapses partly related to climatic conditions; for example, migrating anchovy schools arrived late or failed to arrive at the Anatolian coast when fall temperatures increased. It is therefore of importance to understand the conditions required for successful overwintering migration and explore different migration routes. This study invokes a Lagrangian modeling approach applied to satellite derived circulation and temperature data as a first attempt to model anchovy migration dynamics in the Black Sea. This modeling approach takes the influence of the physical environment into account, while the quality of overwintering grounds, adaptive, schooling, and homing behavior is neglected. The model is used to investigate the possible influence of inter-annual and seasonal variability of temperature and surface currents, as well as the influence of migration behavior on the success of anchovy overwintering migration for both the populations inhabiting the Black Sea. the Black Sea and Azov Sea anchovy.

Date

15.11.2017

Time

13:30 h

Place

Bundesstr. 53, room 022/023
Seminar Room 022/023, Ground Floor, Bundesstrasse 53, 20146 Hamburg, Hamburg

Speaker

Ceren Guraslan, Institute of Oceanography, University of Hamburg

Organizers

Armin Köhl

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