The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder easternberingsea00hood Year: 1981 698 Marine birds Figure 40-17. Pelagic distribution of shearwaters—air and ship surveys: September-November. especially productive. Our observations neither con- firm nor refute the shifts of birds into and out of Bristol Bay reported by Shuntov (1972) and Bartonek and Gibson (1972). Contrary to Shuntov's (1972) opinion that his esti- mates of tube-nosed birds were high, our data suggest that his and other estimates were low. Our absolute minimum estima
The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder easternberingsea00hood Year: 1981 698 Marine birds Figure 40-17. Pelagic distribution of shearwaters—air and ship surveys: September-November. especially productive. Our observations neither con- firm nor refute the shifts of birds into and out of Bristol Bay reported by Shuntov (1972) and Bartonek and Gibson (1972). Contrary to Shuntov's (1972) opinion that his esti- mates of tube-nosed birds were high, our data suggest that his and other estimates were low. Our absolute minimum estimate is that 9 million shearwaters occur in the eastern Bering Sea in summer, and that average numbers are probably more on the order of 20 mil- lion, with more than 45-65 million possibly occurring during peak periods. Our records indicate that Sooty Shearwaters make up less than 10 percent of the total shearwaters in the eastern Bering Sea, and that they are generally con- fined to the most southern part of that area. We also suspect that the number of Sooty Shearwaters in the Bering Sea is highly variable between years and that the proportion of this species may vary between sea- sons. Whichever value is used and whatever the spe- cies composition, the impact of shearwaters on Bering Sea ecosystems must be high. Gadfly Petrels (Pterodroma spp.) The Mottled Petrel (P. inexpectata) is a regular non- breeding visitor (July-October) to the Bering Sea, where it is found in low numbers and apparently re- stricted to oceanic waters south of 56°N. Cook's Petrel (P. cookii) may visit waters of the western Be- ring Sea, but the only record to date is a specimen taken near Adak, Alaska. Fork-tailed and Leach's Storm-Petrels (Oceanodroma furcata and O. leucorhoa) In the Bering Sea, Fork-tailed and Leach's Storm- Petrels breed only on the Komandorsky and Aleutian islands; there are relatively few known breeding sites for the Leach's Storm-Petrel. The general similarity in breeding distr
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