Summary of genetic stock identification studies in the Bering

• Main Author: Mike Canino
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2005
• Subjects: Adak; Bering Sea
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.649.1075; http://www.afsc.noaa.gov/REFM//CBS/Docs/June_2005_workshop/wp8.pdf

differentiation across broad spatial scales in the Bering Sea. A more recent study using mitochondrial DNA restriction fragment length polymorphism (RFLP) provided some evidence for population substructure at smaller spatial scales in the eastern Bering Sea (Mulligan et al. 1992). However, other studies examining mtDNA (Shields and Gust 1995; Kim et al. 2000), nuclear microsatellite DNA (O'Reilly et al. 2004), or a combination of allozyme and mtDNA variation (Olsen et al. 2002) have failed to resolve stock discretion in the eastern Bering Sea. A study of variation at the pantophysin (Pan I) locus (Canino et al. in press), a gene that appears to be influenced by natural selection (Canino and Bentzen 2004), showed a clear distinction between a sample from the central Bering Sea and the Unimak Pass area (Fig. 1). However, the central Bering Sea sample was taken in September, thus the potential for stock admixture can not be ruled out. Gene frequency distributions at the Pan I locus were correlated with water temperatures (Fig.2) suggesting the effects of temperature-mediated selection over moderate geographic scales. Table 1 summarizes various genetic studies on pollock, the areas covered, methods used, and key results. Currently, there is no conclusive evidence for genetic discretion of the Donut Hole stock component in the Bering Sea. Results from Mulligan et al. (1992) showed a sample from Adak Island to be distinct