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首页> 外文期刊>Polar biology >Variation in non-metrical skull traits of polar bears (Ursus maritimus) and relationships across East Greenland and adjacent subpopulations (1830-2013)
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Variation in non-metrical skull traits of polar bears (Ursus maritimus) and relationships across East Greenland and adjacent subpopulations (1830-2013)

机译:极熊(URSUS Maritimus)的非度量颅骨特征的变异和东格陵兰群岛和邻近亚的关系(1830-2013)

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摘要

Knowledge of subpopulation identity including substructure is a prerequisite for sound management of polar bears (Ursus maritimus). It is not known whether the present catch of polar bears in the East Greenland subpopulation (EG) is sustainable. We used the Mean Measure of Divergence (MMD) to examine geographical variation in non-metrical traits from 1414 polar bear (Ursus maritimus) skulls collected in East Greenland (EG), Svalbard (SVA), Franz Josef Land (FJL), Davis Strait (DS), Baffin Bay (BB), and Kane Basin (KB), between 1830 and 2013. We focused on East Greenland with the goal of examining substructuring in the subpopulation. We did not find significant differences among samples across four areas of the EG subpopulation (i.e., offshore Fram Strait, NE, SE, and SW Greenland) using data from 1830 to 1983. Our analyses did not lend support to substructuring. However, we draw our conclusions with caution because skulls were sampled over a long time period and had low power due to small sample sizes. Also, comparisons were limited to pre-1980s skulls. The decrease in sea ice in EG since the 1990s due to climate change may have led to substructuring not detected with MMD. This study contributes to the current efforts by Greenland authorities to quantify connectivity of polar bears between southeast and northeast Greenland which is important information for the evaluation of the sustainability of the catch of bears from the EG subpopulation.
机译:包括子结构包括子结构的亚贫乏的认识是北极熊(Ursus Maritimus)的健全管理的先决条件。尚不清楚东格陵兰亚群(例如)的北极熊的目前捕获是可持续的。我们使用了均衡(MMD)的平均衡量标准(MMD)来检查来自东格陵兰(例如),斯瓦尔巴(例如SVA),Franz Josef Land(FJL),戴维斯海峡(戴维斯海峡) (DS),Baffin Bay(BB)和Kane盆地(KB)之间,在1830年和2013年之间。我们专注于东格陵兰,目标是在亚贫困中检查子结构。我们在使用从1830年至1983年的数据中使用数据的四个区域(即,离岸FRAM STRIED,NE,SE和SE和SW格陵兰)的四个地区的样本中没有发现显着差异。我们的分析并没有向子结构借出支持。然而,我们谨慎地得出我们的结论,因为颅骨在很长一段时间内采样,并且由于小型样本尺寸而具有低功率。此外,比较仅限于20世纪80年代前的头骨。由于气候变化引起的20世纪90年代以来,海冰的减少可能导致未与MMD检测到的子结构。本研究有助于格陵兰岛当局规定东南和东北地区北极熊连通性的努力,这是评估来自例如亚居民的熊群的可持续性的重要信息。

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