Modeling the Remote and Local Connectivity of Antarctic Krill Populations Along the Western Antarctic Peninsula

• Main Authors: Pinones, Andrea, Hofmann, Eileen E., Daly, Kendra L., Dinniman, Michael S., Klinck, John M.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: ODU Digital Commons 2013
• Subjects: Euphasia superba; Lagrangian particles; Connectivity; Circulation; Circumpolar Deep Water; Antarctic Peninsula; Fresh Water Studies; Marine Biology; Oceanography and Atmospheric Sciences and Meteorology; Antarctic; The Antarctic; Bellingshausen Sea; Antarc*; Antarctic Krill; Euphausia superba
• Online Access: https://digitalcommons.odu.edu/ccpo_pubs/9; http://www.int-res.com/abstracts/meps/v481/p69-92/

The abundance and distribution of Antarctic krill Euphausia superba over the western Antarctic Peninsula (wAP) continental shelf suggest that these populations are maintained by inputs from upstream sources via advection of individuals that originated in the Bellingshausen Sea, in addition to local spawning and retention. The objective of our study was to evaluate these 2 mechanisms (remote and local inputs) and the consequences for wAP Antarctic krill populations. The relative effect of local versus remote connectivity was investigated using Lagrangian particle tracking experiments. Particles released in the Bellingshausen Sea were transported to the wAP shelf in 120 d, which is consistent with the time required for Antarctic krill eggs to develop into late-stage larvae. An estimated 23% of the particles released along the shelf break crossed the outer shelf and were transported to the mid and inner regions of the wAP shelf via 3 pathways that provide conduits for onshore intrusions of Circumpolar Deep Water (CDW). Of the particles that moved onto the wAP shelf, 54% were transported to inner shelf regions that are associated with areas of enhanced biological production. Of the particles at the outer shelf similar to 33% continued transport northeastward with the Antarctic Circumpolar Current. Particles released in the mid and inner shelf showed limited connectivity and low export from the shelf (