The winter distribution of chinstrap penguins from two breeding sites in the South Shetland Islands of Antarctica
The winter distribution of chinstrap penguins from two breeding sites in the South Shetland Islands of Antarctica
复制标题
南极洲南设得兰群岛两个繁殖地的帽带企鹅的冬季分布
DOI：
10.1007/s00300-007-0283-1
复制
发表时间：
2007
期刊：
影响因子：
1.7
通讯作者：
S. Trivelpiece
中科院分区：
文献类型：
--
作者：
W. Trivelpiece;S. Buckelew;C. Reiss;S. Trivelpiece
Satellite telemetry was used to determine the winter movements of eight chinstrap penguins from two breeding colonies in the South Shetland Islands, Antarctica during the 2000 and 2004 austral winters. Chinstrap penguins foraged largely inshore, on the shelf, north of the South Shetland Islands during 2000, but foraged mainly offshore in pelagic waters in 2004. Analyses of foraging trip durations during the chick-rearing periods that preceded the 2000 and 2004 winters suggest that prey were more abundant inshore during the summer of 2000 than in 2004. Oceanographic data further revealed the presence of a strong shelf-slope front in 2000 that was absent in 2004. In addition, two of the six chinstrap penguins from the colony in Admiralty Bay migrated from the South Shetland Islands region to the vicinity of the South Orkney and South Sandwich Islands, distances of 800 and 1,300 km, respectively. We postulate that the differences in winter migratory behavior among chinstrap penguins from this colony may reflect individual ties to different ancestral epicenters of chinstrap populations; one older and local in the South Shetland Islands and one relatively recent, arising from the emigration of chinstrap penguins that occurred during the expansion of this species in the mid-1900s.
