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首页> 外文期刊>Polar biology >Satellite imagery can be used to detect variation in abundance of Weddell seals (Leptonychotes weddellii) in Erebus Bay, Antarctica
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Satellite imagery can be used to detect variation in abundance of Weddell seals (Leptonychotes weddellii) in Erebus Bay, Antarctica

机译：卫星图像可用于检测南极Erebus湾的Weddell海豹（Leptonychotes weddellii）的丰度变化

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The Weddell seal population in Erebus Bay, Antarctica, represents one of the best-studied marine mammal populations in the world, providing an ideal test for the efficacy of satellite imagery to inform about seal abundance and population trends. Using high-resolution (0.6 m) satellite imagery, we compared counts from imagery to ground counts of adult Weddell seals and determined temporal trends in Erebus Bay during November 2004-2006 and 2009, and December 2007. Seals were counted from Quick-Bird-2 and WorldView-1 images, and these counts were compared with ground counts at overlapping locations within Erebus Bay during the same time. Counts were compared across years and within individual haul-out locations. We counted a total of 1,000 adult Weddell seals from five images across all years (for a total of 21 satellite-to-ground count comparisons), approximately 72% of the total counted on the ground at overlapping locations. We accurately detected an increase in abundance during 2004-2009. There was a strong, positive correlation (r = 0.98, df= 3, P < 0.003) between ground counts and counts derived from the imagery. The correlation between counts at individual haul-out locations was also strong (r = 0.80, df=9, P < 0.001). Detection rates ranged from 30 to 88%. Overall, our results showed the utility of high-resolution imagery to provide an accurate way to detect the presence and variation in abundance of Weddell seals. Our methods may be applied to other species in polar regions, such as walruses or polar bears, particularly in areas where little is known about population status.
机译：位于南极洲Erebus湾的Weddell海豹种群是世界上研究最多的海洋哺乳动物种群之一，为卫星图像的有效性提供了理想的测试方法，以了解海豹的数量和种群趋势。使用高分辨率（0.6 m）卫星图像，我们比较了成年Weddell海豹从影像到地面的计数，并确定了Erebus湾在2004-2006年和2009年以及2007年12月的时间趋势。从Quick-Bird- 2张和WorldView-1图片，并将这些计数与Erebus湾内重叠位置的地面计数同时进行比较。比较了不同年份和各个出库地点的计数。我们从所有年份的五张图像中算出了总共1000只成年的魏德海豹（总共进行了21次卫星到地面的计数比较），大约占重叠地点在地面上总数的72％。我们准确地检测到了2004-2009年间的丰度增加。地面计数与从影像得出的计数之间存在很强的正相关（r = 0.98，df = 3，P <0.003）。各个搬出地点的计数之间的相关性也很强（r = 0.80，df = 9，P <0.001）。检出率在30％到88％之间。总体而言，我们的结果表明高分辨率图像的实用性提供了一种精确的方法来检测Weddell印章的存在和丰度变化。我们的方法可能适用于极地地区的其他物种，例如海象或北极熊，尤其是在对种群状况知之甚少的地区。

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