Shawn Larson

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The bluntnose sixgill shark, Hexanchus griseus, is a widely distributed but poorly understood large, apex predator. Anecdotal reports of diver-shark encounters in the late 1990's and early 2000's in the Pacific Northwest stimulated interest in the normally deep-dwelling shark and its presence in the shallow waters of Puget Sound. Analysis of underwater(More)
of longstanding speculation by fi shermen, biologists, and California Fish and Game representatives. Sea otters are a keystone predator in kelp forests along the central California coast, and they are voracious consumers of shellfi sh. Since their return from the brink of extinction early in the 20th century, their impact on shell-fi sh populations has been(More)
This is the first in-situ study of feeding behaviors exhibited by bluntnose sixgill sharks. Bait was placed beneath the Seattle Aquarium pier situated on the waterfront in Elliott Bay, Puget Sound, Washington at 20m of water depth. Cameras and lights were placed around the bait box to record sixgill shark presence and behavior while feeding. Analysis of(More)
The broadnose sevengill shark, Notorynchus cepedianus, a common coastal species in the eastern North Pacific, was sampled during routine capture and tagging operations conducted from 2005-2012. One hundred and thirty three biopsy samples were taken during these research operations in Willapa Bay, Washington and in San Francisco Bay, California. Genotypic(More)
Novel leafy seadragon (Phycodurus eques) microsatellite loci were developed via standard cloning techniques and tested for use in population genetics studies. Six out of a total of twelve microsatellites tested were usable for population analysis. Seadragon samples from Western Australia (N = 6), Southern Australia (N = 11), and a captive group (N = 11)(More)
It's clear that within the sea otter's stabilized foraging range there can be virtually no human harvest of abalones (Haliotis spp.) (except for a few taken intertidally). d.j. miller, 1974, california department of fish and game marine resources leaflet no. 7 T he southern sea otter (Enhydra of longstanding speculation by fi shermen, lutris nereis) is one(More)
All existing sea otter, Enhydra lutris, populations have suffered at least one historic population bottleneck stemming from the fur trade extirpations of the eighteenth and nineteenth centuries. We examined genetic variation, gene flow, and population structure at five microsatellite loci in samples from five pre-fur trade populations throughout the sea(More)
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