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Discovery of 100-160-year-old iceberg gouges and their relation to halibut habitat in Glacier Bay, Alaska

American Fisheries Society Symposium

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Abstract

Side-scan sonar and multibeam imagery of Glacier Bay, Alaska, revealed complex iceberg gouge patterns at water depths to 135 m on the floor of Whidbey Passage and south to the bay entrance. These previously undiscovered gouges likely formed more than 100 years ago as the glacier retreated rapidly up Glacier Bay. Gouged areas free of fine sediment supported greater biodiversity of Pacific halibut Hippoglossus stenolepsis than nearby sediment-filled gouges, probably due to increased habitat complexity. Small Pacific halibut were forund more frequently in sediment-free gouged areas, presumably due to higher prey abundance. In contrast, large Pacific halibut were found more frequently on soft substrates such as sediment-filled gouges, where they could bury themselves and ambush prey.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Discovery of 100-160-year-old iceberg gouges and their relation to halibut habitat in Glacier Bay, Alaska
Series title:
American Fisheries Society Symposium
Volume
41
Year Published:
2005
Language:
English
Contributing office(s):
Alaska Biological Science Center
Description:
pp. 235-243
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
American Fisheries Society Symposium
First page:
235
Last page:
243
Number of Pages:
9