Gray Whale Migration
This layer shows the primary pathway used by migrating gray whales off the Oregon coast. This dataset was produced using specific depth contour values based on a gray whale migration study summarized in Ortega-Ortiz and Mate (2008). The results from this study were extrapolated to the entire Oregon coast based on their consistency with similar studies conducted elsewhere on the West Coast of North America. The 10th and 90th percentiles of depth values for each phase of the gray whale migration were used to demarcate the inshore and offshore boundaries of the migratory pathway. Phases of gray whale migration and 10th-90th percentile depth ranges are classified as: "Southbound" (34 - 65 m), "Northbound phase A" (31 - 62 m), and "Northbound phase B" (mothers and calves, 15 - 59 m). As a composite of these three phases, the migratory pathway in this dataset extends over the depth range 15-65 m including the Westermost depth contour, the shallowest Easternmost contour for migration without calves, and the shallowest Easternmost contour of migration of mothers with calves.While this layer shows the primary migratory pathway, gray whales often occur both in shallower and deeper waters.
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