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- Title
Cryptic population structure in the severely depleted cowcod, Sebastes levis.
- Authors
Hess, Jon E.; Chittaro, Paul; Elz, Anna; Gilbert-Horvath, Elizabeth A.; Simon, Victor; Garza, John Carlos; Morán, Paloma
- Abstract
Cowcod ( Sebastes levis) is a member of a northeastern Pacific Ocean species flock that experienced extensive fishery exploitation. Factors that could produce structure in cowcod include a major biogeographic boundary within cowcod's geographical distribution; severe declines in abundance, potentially, resulting in reductions in effective population size and divergence owing to genetic drift; and dependence on patchily distributed habitat. We examine the following two questions: ( i) is there subdivision present and, if so, is it concordant with the two marine biogeographic regions separated by Point Conception, and ( ii) have cowcod experienced loss of genetic variation owing to population size reduction? Coarse-scale genetic and otolith analyses indicated regional structure across Point Conception. However, analysis of 24 microsatellite DNA loci revealed as many as three cryptic, divergent lineages ( FCT = 0.194) that meet south of Point Conception. The two southern lineages had higher growth rate than the northerly distributed lineage. In general, cowcod is the least genetically diverse of ∼10 rockfishes surveyed with the same markers, but the recent substantial declines in abundance were not reflected by recent genetic bottleneck analyses.
- Subjects
PACIFIC Ocean; GENETIC drift; LINEAGE; THORNYHEADS; GENETIC markers; CONCEPTION, Point (Calif.)
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2014, Vol 71, Issue 1, p81
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/cjfas-2012-0510