Multiple genetic stocks of longfin squid Loligo pealeii in the NW Atlantic : stocks segregate inshore in summer, but aggregate offshore in winter
MetadataShow full item record
KeywordFisheries; Spawning migration; Microsatellites; Population structure; Population recognition; Null alleles
The longfin squid Loligo pealeii is distributed widely in the NW Atlantic and is the target of a major fishery. A previous electrophoretic study of L. pealeii was unable to prove genetic differentiation, and the fishery has been managed as a single unit stock. We tested for population structure using 5 microsatellite loci. In early summer (June), when the squids had migrated inshore to spawn, we distinguished 4 genetically distinct stocks between Delaware and Cape Cod (ca. 490 km); a 5th genetic stock occurred in Nova Scotia and a 6th in the northern Gulf of Mexico. One of the summer inshore stocks did not show genetic differentiation from 2 of the winter offshore populations. We suggest that squids from summer locations overwinter in offshore canyons and that winter offshore fishing may affect multiple stocks of the inshore fishery. In spring, squids may segregate by genetic stock as they undertake their inshore migration, indicating an underlying mechanism of subpopulation recognition.
Author Posting. © Inter-Research, 2006. This article is posted here by permission of Inter-Research for personal use, not for redistribution. The definitive version was published in Marine Ecology Progress Series 310 (2006): 263-270, doi:10.3354/meps310263.
Showing items related by title, author, creator and subject.
Elemental signatures in otoliths of larval walleye pollock (Theragra chalcogramma) from the northeast Pacific Ocean FitzGerald, Jennifer L.; Thorrold, Simon R.; Bailey, Kevin M.; Brown, Annette L.; Severin, Kenneth P. (U.S. Department of Commerce, 2004)The objectives of this study are to determine if larval walleye pollock from different geographic localities can be distinguished based on elemental signatures in their otoliths. By analyzing sagittal otoliths with both ...
Walther, Benjamin D.; Thorrold, Simon R. (2009-10)Variable migration patterns can play a significant role in promoting diverse life history traits among populations. However, population and stage specific movement patterns are generally unknown yet crucial aspects of ...
Bromage, Erin; Carpenter, Lawrence; Kaattari, Stephen; Patterson, Mark (Inter-Research, 2009-02-11)The induction and regulation of heat shock proteins (hsps) is a significant defense mechanism that can preserve metabolic function and foster recovery from short-term stress events. Present coral sampling methodologies ...