Using Videography to Quantify Landscape-Level Availability of Habitat for Grazers: An Example with Emperor Geese in Western Alaska
Using Videography to Quantify Landscape-Level Availability of Habitat for Grazers: An Example with Emperor Geese in Western Alaska
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使用摄像来量化食草动物栖息地的景观水平可用性：以阿拉斯加西部帝王雁为例
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
F. Broerman
中科院分区：
文献类型：
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作者：
Bryce D. Lake;M. Lindberg;J. Schmutz;R. M. Anthony;F. Broerman
我们提出了一种视频方法来估计大规模放牧草坪的可用性，这是阿拉斯加育空-库斯科维姆三角洲帝王鹅(Chen Canagica)幼崽使用的重要食物资源。1999年、2003年和2004年在六个地点进行了抽样，涵盖了北美繁殖的帝王鹅数量的40%。我们在2003年和2004年进行了地面实况调查，以评估放牧草坪分类的准确性。总体而言，放牧草地和非放牧草地生境分类准确率均在91%以上。放牧草坪的可获得性在几年中是稳定的，但在不同地点和不同地点之间存在差异。一些地方的可供放牧的草坪多达三倍，再加上鹅的密度，很可能代表着人均食物供应量的巨大差异。我们的结果表明，摄像是一种在大范围内快速采样和准确识别细小规模栖息地的有用方法。我们给出了它用于估计帝王鹅的首选食物资源的可用性，但该方法也可以应用于许多其他情况。
We present a videography approach to estimating large-scale availability of grazing lawns, an important food resource used by broods of emperor geese ( Chen canagica ) on the Yukon-Kuskokwim Delta, Alaska. Sampling was conducted in 1999, 2003, and 2004 at six locations that encompassed ~40% of the North American population of breeding emperor geese. We conducted ground truthing in 2003 and 2004 to estimate how accurately grazing lawn was classified. Overall, classification accuracy for grazing lawn and non-grazing lawn habitat was greater than 91%. Availability of grazing lawns was stable among years, but varied both among and within locations. Some locations have up to three times as much available grazing lawn, which in combination with densities of geese, likely represents dramatic variation in per capita food availability. Our results suggest that videography is a useful way to sample quickly across a large region and accurately identify fine-scale habitats. We present its use for estimating the availability of a preferred food resource for emperor geese, but the method could be applied to many other cases.