Thus, the first survey
was administered one year prior to the Gulf Oil Spill, and the
second survey was administered six months following the spill.
Numerous survey versions containing varying combinations of
three endangered species from a set of eight were implemented,
but data for this analysis was limited to surveys containing information
on the North Pacific Right Whale, the Hawaiian Monk
seal, and either the Upper Willamette River or Puget Sound
Chinook salmon.