Seabird and marine mammal at-sea distribution in the western Bering Sea and along the eastern Kamtchatka Peninsula
Claude R. JOIRIS 1, 2 *
1 Laboratory for Polar Ecology (PolE), 26130 Saint-Restitut, France;
2 Conservation Biology Unit, Royal Institute forNatural Sciences, 1000 Brussels, Belgium
* E-mail: firstname.lastname@example.org
Abstract Seabird and marine mammal at-sea distribution in the western Bering Sea and along the eastern Kamtchatka Peninsula was determined during 114 transect counts, lasting 30 min each, in September 2018. A total of 58000 seabirds were tallied, i.e. a mean value of 510 per count. The most abundant species was short-tailed shearwater: 43250 individuals representing 74% of the total. Fulmar and kittiwake represented 13% and 8% of the total. Important geographical differences were noted, concerning both the number of seabird species and their abundance. The following species were tallied mainly in the northern zone (North of 60°N): fulmar (light morphs), short-tailed shearwater, Vega (herring) gull and horned puffin. In the southern zone, including Commander – Komandorski – Islands, observed species includedfulmar (dark morphs), pelagic cormorant, glaucous-winged gull, red-legged kittiwake and black guillemot. The vast majority of the 100 cetaceans and pinnipeds were tallied in the southern area, mainly porpoises, killer 25whale and humpback whale, and Largha (spotted) seal.
Keywords seabirds, marine mammals, at-sea distribution, Bering Sea, Kamchatka