1 July 2001 Diving Depths of Shearwaters
Alan E. Burger
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Maximum diving depths were measured for shearwaters breeding on Cousin Island, Seychelles. Eighty-three percent of 23 Wedge-tailed Shearwaters (Puffinus pacificus) dived, and their mean maximum depth was 14 m (SD = 23 m, range 1–66 m, N = 19). All Audubon's Shearwaters (P. lherminieri) dived, and their mean maximum depth was 15 m (SD = 12 m, range 6–35 m, N = 7). These data contradict the hypothesis that tropical shearwaters should not specialize in underwater foraging. They are capable of exploiting deep prey unavailable to most other tropical seabirds. Five Puffinus species (temperate and tropical) attained allometrically scaled maximum depths comparable to those of penguins and alcids.

Alan E. Burger "Diving Depths of Shearwaters," The Auk 118(3), 755-759, (1 July 2001). https://doi.org/10.1642/0004-8038(2001)118[0755:DDOS]2.0.CO;2
Received: 3 August 2000; Accepted: 1 January 2001; Published: 1 July 2001
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