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ICES Journal of Marine Science: Journal du Conseil Advance Access published online on November 12, 2007
ICES Journal of Marine Science: Journal du Conseil, doi:10.1093/icesjms/fsm158
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© 2007 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Spatial distribution of juvenile and adult female Tanner crabs (Chionoecetes bairdi) in a glacial fjord ecosystem: implications for recruitment processes

Julie K. Nielsen1,, S. James Taggart2, Thomas C. Shirley1 and Jennifer Mondragon2

1 Juneau Center, School of Fisheries and Ocean Sciences, University of Alaska Fairbanks, 11120 Glacier Highway, Juneau, AK 99801, USA. Present address of T. S. Shirley: Harte Research Institute, Texas A&M University-Corpus Christi, 6300 Ocean Drive, Unit No. 5869, Corpus Christi, TX 78412-5869, USA
2 USGS Alaska Science Center, 3100 National Park Drive, Juneau, AK 99801, USA. Present address of J. Mondragon: NOAA Fisheries, 709 West 9th Street, Juneau, AK 99801, USA

Correspondence to J. K. Nielsen: tel: +1 907 364 1579; fax: +1 907 364 1540; e-mail: j.nielsen{at}uaf.edu

Nielsen, J. K., Taggart, S. J., Shirley, T. C., and Mondragon, J. 2007. Spatial distribution of juvenile and adult female Tanner crabs (Chionoecetes bairdi) in a glacial fjord ecosystem: implications for recruitment processes. – ICES Journal of Marine Science, 64: 1772–1784.

A systematic pot survey in Glacier Bay, Alaska, was conducted to characterize the spatial distribution of juvenile and adult female Tanner crabs, and their association with depth and temperature. The information was used to infer important recruitment processes for Tanner crabs in glaciated ecosystems. High-catch areas for juvenile and adult female Tanner crabs were identified using local autocorrelation statistics. Spatial segregation by size class corresponded to features in the glacial landscape: high-catch areas for juveniles were located at the distal ends of two narrow glacial fjords, and high-catch areas for adults were located in the open waters of the central Bay. Juvenile female Tanner crabs were found at nearly all sampled depths (15–439 m) and temperatures (4–8°C), but the biggest catches were at depths <150 m where adults were scarce. Because adults may prey on or compete with juveniles, the distribution of juveniles could be influenced by the distribution of adults. Areas where adults or predators are scarce, such as glacially influenced fjords, could serve as refuges for juvenile Tanner crabs.

Keywords: Chionoecetes, glacial habitat, juvenile, recruitment, refuge, spatial autocorrelation, spatial distribution, Tanner crab

Received 7 February 2007; accepted 3 October 2007.


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