Estimating the Barents Sea polar bear subpopulation size
Estimating the Barents Sea polar bear subpopulation size
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DOI：
10.1111/j.1748-7692.2008.00228.x
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发表时间：
2009-01-01
影响因子：
2.3
通讯作者：
Wiig, O.
中科院分区：
文献类型：
--
作者：
Aars, J.;Marques, T. A.;Wiig, O.
2004年8月进行了一次大规模调查，以估计巴伦支海北极熊亚群的规模。我们结合了直升机样线距离抽样（DS）调查，在大部分的调查区域，在小面积的总计数不适合DS。由于天气所限，我们未能勘测部分原计划进行勘测的地区。对于这些，丰度是使用比率估计器估计的，其中辅助变量是卫星遥测定位的次数（往年）。我们估计，巴伦支海亚群约有2，650只（95% CI约为1，900 - 3，600）熊。由于气候变化的潜在灾难性影响，目前对北极熊管理的浓厚兴趣，令人惊讶的是，许多亚种群的大小仍然是未知的。我们在这里表明，样线抽样是一个很有前途的方法，解决需要的丰度估计。
A large-scale survey was conducted in August 2004 to estimate the size of the Barents Sea polar bear subpopulation. We combined helicopter line transect distance sampling (DS) surveys in most of the survey area with total counts in small areas not suitable for DS. Due to weather constraints we failed to survey some of the areas originally planned to be covered by DS. For those, abundance was estimated using a ratio estimator, in which the auxiliary variable was the number of satellite telemetry fixes (in previous years). We estimated that the Barents Sea subpopulation had approximately 2,650 (95% CI approximately 1,900-3,600) bears. Given current intense interest in polar bear management due to the potentially disastrous effects of climate change, it is surprising that many subpopulation sizes are still unknown. We show here that line transect sampling is a promising method for addressing the need for abundance estimates.