Summary: Harbor seal movements and hot spots in the Georgia Basin
revealed through the use of satellite-telemetry.
Sarah Hardee*, Kenady Reuland*, Monique Lance§, Steve Jeffries§, Peter Olesiuk and Alejandro Acevedo*
*Dept. Biology, Western Washington Univ., WA; §Wash. Dept. of Fish & Wildlife, WA; Dept. of Fisheries and Oceans, Canada
STUDY SITE METHODS
· April and May 2007 using beach seines and boat rushes.
· Three sites: two rocky reefs and a mudflat bay (Fig. 1).
· Sex, length and mass were recorded for each seal.
· SPOT05 and SPLASH satellite-tags (Wildlife
Computers, Redmond, WA) attached with epoxy.
DATA PROCESSING AND ANALYSIS
· Argos satellite locations filtered using modified two-step method2.
· Standard (1, 2, and 3) and auxiliary (A, B, and 0) locations passing the
filter were input into ArcGIS 9.2.
· Minimum convex polygons were drawn for each seal with Hawth's Tools3
to compare tagging sites using linear mixed effects models (LME) in "R."
· KernelHR4 calculated a smoothing parameter (h) for fixed kernel density
analysis using least squares cross validation.
· BRange5 calculated a weight for each location accounting for spatial and