AFSC/REFM: Pacific cod genetics in the Aleutian Islands 2004-2007

Metadata Updated: October 1, 2021

Landscape genetics of Pacific cod Gadus macrocephalus within the Bering Sea and Aleutian Islands (BSAI) management area of Alaska was examined in samples from nine spawning locations, including one temporal replicate sample, using 17 microsatellite DNA markers. This study examined fine-scale population structure of Pacific cod in the BSAI with the goal of identifying breaks in genetic continuity associated with physical barriers to migration and larval transport. Samples were taken from spawning fish collected from the western Aleutian Islands east to Unimak Pass and as far north as the Pribilof Islands. Overall, this work confirms previous studies, which found that genetic differentiation between samples is proportional to the distance between them, and also resolves population structure on a scale not previously possible. Results indicate that dispersal is not continuous at a fine scale and several distinct genetic groups were identified that correspond to differences in the physical environment of the BSAI. The data provide evidence for limited connectivity among spawning groups; in particular, there is evidence that a barrier exists between the Aleutian Islands and the eastern Bering Sea. In addition, analysis of molecular variance and Monmonier algorithm results suggest that, within the Bering Sea, the Unimak Pass and Pribilof Islands spawning groups may be distinct from each other, and the Wombling analysis indicates that samples west of Amchitka Pass in the western Aleutians may be distinct from those in the eastern Aleutians.

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License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Date July 28, 2021
Metadata Created Date November 12, 2020
Metadata Updated Date October 1, 2021
Reference Date(s) 2013-10 (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from NMFS AFSC

Graphic Preview

Specimen collection locations.

Additional Metadata

Resource Type Dataset
Metadata Date July 28, 2021
Metadata Created Date November 12, 2020
Metadata Updated Date October 1, 2021
Reference Date(s) 2013-10 (publication)
Responsible Party (Point of Contact, Custodian)
Contact Email
Guid gov.noaa.nmfs.inport:23101
Access Constraints Cite As: Alaska Fisheries Science Center, [Date of Access]: AFSC/REFM: Pacific cod genetics in the Aleutian Islands 2004-2007 [Data Date Range],, Access Constraints: There are no legal restrictions on access to the data. They reside in public domain and can be freely distributed. | Use Constraints: User must read and fully comprehend the metadata prior to use. Applications or inferences derived from the data should be carefully considered for accuracy. Acknowledgement of NOAA/NMFS/AFSC, as the source from which these data were obtained in any publications and/or other representations of these, data is suggested.
Bbox East Long -170
Bbox North Lat 55
Bbox South Lat 50
Bbox West Long 170
Coupled Resource
Frequency Of Update notPlanned
Graphic Preview Description Specimen collection locations.
Graphic Preview File
Graphic Preview Type URL
Harvest Object Id db27834c-2be3-40a0-830a-dd97fcf28d4d
Harvest Source Id 26a29bb9-50b0-47fd-920b-edc74aa6ec76
Harvest Source Title NMFS AFSC
Licence NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
Metadata Language eng
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[170.0, 50.0], [-170.0, 50.0], [-170.0, 55.0], [170.0, 55.0], [170.0, 50.0]]]}
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2004
Temporal Extent End 2007

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