Abstract


PHYLOGEOGRAPHY AND CONNECTIVITY OF FOUR SIBLING SPECIES OF PSEUDOCALANUS (COPEPODA: CALANOIDA) IN THE NORTH PACIFIC AND ARCTIC OCEANS

Pseudocalanus (Copepoda: Calanoida) is one of the most numerically dominant genera in Arctic and sub-Arctic waters. However, Pseudocalanus presents taxonomic difficulty in morphological identification down to the species level, resulting in a general lack of detailed species-specific distribution data. To determine population genetic structure of the species, the mitochondrial gene cytochrome oxidase I (mtCOI) was sequenced for two temperate (P. mimus and P. newmani) and two Arctic (P. acuspes and P. minutus) species from the Chukchi and Beaufort seas, the Gulf of Alaska, and two fjord systems within Prince William Sound. Genetic data show significant differentiation of the Beaufort Sea population, as well as populations within the fjord systems. Partial genetic isolation (i.e., low gene flow) of the Beaufort Sea population may be a consequence of the Beaufort Gyre’s strong frontal zone, which may generate a faunal barrier between the western Arctic Ocean and the N. Pacific/Chukchi Sea. We also report the likelihood of alternative models of population connectivity in order to better understand directions of gene flow between sampled populations of Pseudocalanus in relation to oceanographic features. Under current warming trends, is it conceivable that faunal barriers for Pseudocalanus will shift northward, allowing habitat range expansion and potentially increased population connectivity between Arctic and sub-Arctic populations.

Authors

Questel, J. M., University of Alaska Fairbanks, USA, jmquestel@alaska.edu

Blanco-Bercial, L., University of Connecticut, USA, leocadio@uconn.edu

Hopcroft, R. R., University of Alaska Fairbanks, USA, rrhopcroft@alaska.edu

Bucklin, A., University of Connecticut, USA, ann.bucklin@uconn.edu

Details

Oral presentation

Session #:007
Date: 2/25/2015
Time: 11:45
Location: Albeniz (Floor -2)

Presentation is given by student: Yes