Space use of Pacific harbor seals (Phoca vitulina richardii) from two haulout locations along the Oregon coast

PloS One
Sheanna SteingassAmanda M Bishop

Abstract

There are approximately 10,000-12,000 Pacific harbor seals (Phoca vitulina richardii) inhabiting the Oregon coast, and unlike other species of pinnipeds in this region, are reliably present year-round. Despite this, and drastic rebounds in population since the enactment of the Marine Mammal Protection Act, limited data is available for the present period regarding their space use at sea, and within estuarine, riverine, or bay areas within the state. To examine site-based differences in space use for 24 adult Pacific harbor seals captured and outfitted with satellite transmitters at two predominant haulout sites on the Oregon Coast, USA. We captured 24 adult harbor seals from two haulout sites on the Central Oregon coast between September 2014-16 and fitted them with external Wildlife Computers SPOT5 satellite transmitters to track movement. Using state-space modeled locations derived from satellite telemetry data, we evaluated spatial behavior of these animals using a correlated random walk model via R package crawl. Kernel density estimation was subsequently used to calculate home range and core area for each animal. Percent use of open ocean habitat versus use of estuaries, rivers and bays was quantified, as was an initial ex...Continue Reading

References

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Software Mentioned

Fixpath
ArcGis
Spatial Join
ArcGIS Spatial Join
R package crawl
R
PFEL
MuMIN
R package : argosfilter
Geospatial Modeling Environment Ecology

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