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This technical report summarizes marine mammal occurrence data for five separate regions along coastal U.S. where military overflights occur. The five regions are the Northeast Pacific, Southeast Pacific, Gulf of Mexico, Southwest Atlantic, and Northwest Atlantic. The data include marine mammal species summary tables that provide the species common and scientific names, stock identity and most recent estimate of population size, seasonal occurrence index, dive profile, and comments. The information summarized in the tables presents "generalities" with some data based on better information than others.

Aerial surveys of bowhead whales and, secondarily, other marine mammals were made from 1 Sep - 23 Oct 1987 in the western Beaufort and northeastern Chukchi Seas. A shore-based acoustic monitoring station was maintained at Barrow, Alaska from 9 Sept 21 Oct 1987 to record the calls of migrating bowhead whales as they passed into the northeastern Chukchi Sea. Survey results and observations on bowhead whale distribution, relative abundance and density, migration patterns, general behavior, and sound production are presented. Presented also are survey results and observations on gray whale distribution, relative abundance, and general behavior on belukha and walrus distribution, and relative abundance. Incidental sightings of all marine mammals are reported. This report also summarizes the study efforts made between 1979 and 1987. Keywords: Balaena mysticetus, Eschrichtius robustus, Geographical distribution, Autumn, Marine biological noise, Tracking, Alaska, Chukchi Sea, Beaufort Sea, Animal migration, Whale population, Habitat, Whale behavior, Population density., Prepared in collaboration with SEACO.

Aerial surveys and acoustic recordings of bowhead whales and, secondarily, other marine mammals were made from mid-August 1986 through October 1986 in the eastern Chukchi and Alaskan Beaufort Sea. In addition, a shore-based acoustic station was established on Barter Island, Alaska to record the calls of migrating bowhead whales as they passed through the eastern Alaskan Beaufort Sea. Survey results and observations on bowhead whale distribution, relative abundance and density, migration patterns, general behavior, and sound production are presented. Presented here also are survey results and observations on gray whale distribution, relative abundance, and general behavior. Incidental sightings of all marine mammals are reported.