Distribution, density, and abundance of pack-ice seals in the Amundsen and Ross Seas, Antarctica
Distribution, density, and abundance of pack-ice seals in the Amundsen and Ross Seas, Antarctica
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DOI：
10.1016/j.dsr2.2010.10.037
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发表时间：
2011-05-01
影响因子：
3
通讯作者：
Stewart, Brent S.
中科院分区：
文献类型：
--
作者：
Bengtson, John L.;Laake, Jeff L.;Stewart, Brent S.
1999年12月26日至2000年3月24日，我们在罗斯海和阿蒙森海使用破冰船和直升机从这些破冰船部署的四种冰栖phocid鳍足类的人口调查。我们使用样线法，通过直升机调查了23，671公里，通过船舶调查了3，694公里，总覆盖范围为53，217公里（2）。我们在7，104个群体中发现并确认了11，308只海豹，并利用距离采样方法估计了密度，并对从标记海豹的卫星遥测中得出的海豹被拖出的概率进行了校正，从而估计了它们的丰度。食蟹海豹数量最多（约170万只），其次是威德尔海豹（33万只）、罗斯海豹（22,600只）和豹纹海豹（15,000只）。我们对丰度的估计很难与早先的估计直接比较，因为我们所覆盖的地理区域以及我们对调查和分析方法的改进。尽管存在这些限制，并对方法的差异进行了一些调整，我们发现我们对食蟹海豹丰度的估计与最近在罗斯海和阿蒙森海以及沿着乔治-奥茨海岸进行的调查结果相似。我们对威德尔海豹的估计是我们在罗斯海和阿蒙森海调查的大面积浮冰的第一次，但表明这些栖息地对这个物种具有生态重要性。我们对罗斯海豹丰度的估计与20世纪70年代和80年代在这些地区进行的调查估计相对相似，而我们对豹海豹丰度的估计则要低得多。爱思唯尔有限公司出版
We made three sets of population surveys of the four species of ice-inhabiting phocid pinnipeds in the Ross and Amundsen Seas between 26 December 1999 and 24 March 2000 using icebreakers and helicopters deployed from those icebreakers. We used line transect methods to survey 23,671 km by helicopter and 3,694 km by ship accounting for a total coverage of 53,217 km(2). We detected and identified 11,308 seals in 7,104 groups and estimated their abundance from estimates of densities using distance sampling methods and corrections for probability of haul out of seals derived from satellite telemetry of tagged seals. Crabeater seals were most abundant (ca 1.7 million) followed by Weddell seals (330,000), Ross seals (22,600), and leopard seals (15,000). Our estimates of abundance are difficult to directly compare with earlier estimates because of geographic areas covered and by our improvements in survey and analytical methods. Notwithstanding these limitations and with some adjustments for differences in methods, we found that our estimates of abundance for crabeater seals are similar to those from the most recent surveys in the Ross and Amundsen Seas and along the George-Oates Coast. Our estimates for Weddell seals are the first for the broad areas of pack ice that we surveyed in the Ross and Amundsen Seas but indicate that these habitats are ecologically important to this species. Our estimates of abundance of Ross seals were relatively similar to estimates for surveys in these areas in the 1970s and 1980s whereas our estimates of abundance of leopard seals were substantially lower. Published by Elsevier Ltd.