Abundance and Distribution of the Steller Sea Lion
Abundance and Distribution of the Steller Sea Lion
复制标题
北海狮的数量和分布
DOI：
10.2307/1376832
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发表时间：
1961
影响因子：
1.7
通讯作者：
D. W. Rice
中科院分区：
文献类型：
--
作者：
K. Kenyon;D. W. Rice
本文介绍了白令海东部白令海从白令海海峡到阿留申群岛的白令海海狮Eumetopias jubata的观察结果，包括拖出习性、季节性运动和空中调查。海狮在冬季和春季，在繁殖季节之前，下午的时间比早上的时间更多，很少在暴风雨期间外出。在空中调查期间，在水中看到的动物很少，这表明绝大多数动物都是在春季天气晴朗时被拖出来的。普里比洛夫群岛是最北端的繁殖地，但一些动物，可能是成年和亚成年雄性，在夏末和初秋向北迁移。多达1，000艘定期抵达圣劳伦斯岛，少数抵达白令海峡。这些动物在秋天随着冰的推进再次向南移动，但冰并没有使它们离开普里比洛夫群岛。在繁殖范围内的某些运输场是季节性使用的。1959年和1960年，对所有阿留申群岛和阿拉斯加半岛末端附近地区的航空调查显示，有98个栖息地和牵引地，估计总共有大约10万只动物。根据本报告和以前公布的数据，该物种的世界总人口估计约为25万只。
Observations of the Steller sea lion, Eumetopias jubata , including hauling-out habits, seasonal movements, and aerial surveys in eastern Bering Sea from Bering Strait to and including the Aleutian Islands, are presented. Sea lions haul out during winter and spring, prior to the breeding season, in greater numbers in afternoon hours than in morning hours; few haul out during storms. The dearth of animals seen in the water during aerial surveys indicates that the great majority are hauled out during fair weather in the spring. The Pribilof Islands are the northernmost breeding grounds but a number of animals, probably adult and sub-adult males, migrate north in late summer and early fall. As many as 1,000 regularly reach St. Lawrence Island and a few reach Bering Strait. These animals move south again with the advance of ice in the fall but ice does not cause them to desert the Pribilof Islands. Certain hauling grounds within the breeding range are used seasonally. Aerial surveys of all Aleutian Islands and areas near the end of the Alaska Peninsula in 1959 and 1960 revealed 98 rookeries and hauling grounds with an estimated total of about 100,000 animals. The total world population of this species, based on the present report and on previously published data, is estimated to be about a quarter of a million animals.