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Living on the edge: Distribution of Dungeness crab Cancer magister in a recently deglaciated fjord

Marine Ecology Progress Series

By:
, , , , and
https://doi.org/10.3354/meps246241

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Abstract

Glacier Bay, Alaska, has supported a productive Dungeness crab fishery, although the area where the fishery occurred was small relative to the remainder of the Bay. We hypothesized that 1 or more abiotic limiting factors prevented crabs from surviving in the upper Bay. We tested this hypothesis by systematically sampling for relative abundance of Dungeness crabs from the mouth to the head of the Bay. We measured salinity, temperature and turbidity at each of the sampling sites and at permanent stations to characterize the habitat within and among years. We expected to find a completely truncated spatial distribution. Instead, we found that adult Dungeness crabs can survive in habitats heavily influenced by tidewater glaciers. There were significantly fewer crabs in the upper Bay and a sharp decrease in abundance around 40 km from the mouth of the Bay. The region of the Bay beyond 40 km from the mouth had a very low density of predominately adult male crabs. The narrow size frequency distribution and the lack of small crabs is consistent with poor survival in one of the pre-adult life stages in the upper Bay.

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Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Living on the edge: Distribution of Dungeness crab Cancer magister in a recently deglaciated fjord
Series title:
Marine Ecology Progress Series
DOI:
10.3354/meps246241
Volume:
246
Year Published:
2003
Language:
English
Publisher:
Inter-Research Science Center
Contributing office(s):
Alaska Science Center
Description:
12 p.
First page:
241
Last page:
252
Country:
United States
State:
Alaska
Other Geospatial:
Glacier Bay