Chinstrap penguin foraging area associated with a seamount in Bransfield Strait, Antarctica

被引:26
作者
Kokubun, Nobuo [1 ,2 ]
Lee, Won Young [3 ]
Kim, Jeong-Hoon [3 ]
Takahashi, Akinori [1 ,2 ]
机构
[1] Natl Inst Polar Res Japan, Tachikawa, Tokyo 1908518, Japan
[2] SOKENDAI Grad Univ Adv Studies, Sch Multidisciplinary Sci, Dept Polar Sci, Tachikawa, Tokyo 1908518, Japan
[3] Korea Polar Res Inst, Inchon 406840, South Korea
关键词
Foraging habitat; Bathymetry; Bransfield current; Antarctic krill; Upwelling; SOUTH SHETLAND ISLANDS; POPULATION-CHANGES; FUR SEALS; KRILL; BEHAVIOR; VARIABILITY; HABITAT; HOTSPOT; PREY; ALBATROSSES;
D O I
10.1016/j.polar.2015.10.001
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Identifying marine features that support high foraging performance of predators is useful to determine areas of ecological importance. This study aimed to identify marine features that are important for foraging of chinstrap penguins (Pygoscelis antarcticus), an abundant upper-trophic level predator in the Antarctic Peninsula region. We investigated the foraging locations of penguins breeding on King George Island using GPS- depth loggers. Tracking data from 18 birds (4232 dives), 11 birds (2095 dives), and 19 birds (3947 dives) were obtained in 2007, 2010, and 2015, respectively. In all three years, penguins frequently visited an area near a seamount (Orca Seamount) in Bransfield Strait. The percentage of dives (27.8% in 2007, 36.1% in 2010, and 19.1% in 2015) and depth wiggles (27.1% in 2007, 37.2% in 2010, and 22.3% in 2015) performed in this area was higher than that expected from the size of the area and distance from the colony (8.4% for 2007, 14.7% for 2010, and 6.3% for 2015). Stomach content analysis showed that the penguins fed mainly on Antarctic krill. These results suggest that the seamount provided a favorable foraging area for breeding chinstrap penguins, with high availability of Antarctic krill, possibly related to local upwelling. (C) 2015 Elsevier B.V. and NIPR. All rights reserved.
引用
收藏
页码:393 / 400
页数:8
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