Microsatellites reveal high levels of gene flow among populations of the California squid Loligo opalescens

Publication Type:Journal Article
Year of Publication:2001
Authors:D. Reichow, Smith M. J.
Journal:Molecular Ecology
Date Published:May
Accession Number:ISI:000168692900003
Keywords:Cephalopod, genetics, Loligo, Loligo opalescens

Information on the extent of genetic differentiation among populations of the squid Loligo opalescens is crucial for the conservation of this commercially utilized species. We analysed six highly variable microsatellite loci in 11 collections of L. opalescens from different locations and spawning seasons to estimate the relative influence of two major evolutionary forces, gene now and genetic drift. Microsatellite allele frequency patterns suggest that gene now prevents population differentiation in L. opalescens. Tests for genetic differentiation showed homogeneity of the samples with an overall F-ST/R-ST of 0.0028/-0.0013. Genetic uniformity among samples from different year classes indicates that allele frequency patterns in L. opalescens are relatively stable over time. However, a more complete and detailed picture of fine- scale allele frequency shifts in this species will require a systematic microsatellite analysis of local populations over consecutive spawning cycles.

Alternate Journal:Mol. Ecol.
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith