Accuracy of geolocation estimates for flying seabirds
Accuracy of geolocation estimates for flying seabirds
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DOI：
10.3354/meps266265
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发表时间：
2004-01-01
影响因子：
2.5
通讯作者：
Briggs, DR
中科院分区：
文献类型：
--
作者：
Phillips, RA;Silk, JRD;Briggs, DR
使用档案光记录标签的地理定位（全球定位传感或GLS记录）为跟踪动物运动提供了相当大的潜力，但很少有关于飞行海鸟的研究利用了这项技术。我们的研究评估了其有效性确定觅食范围的黑眉信天翁Thalassarche melanophrys同时安装GLS记录仪和卫星发射机（平台终端发射机，PTTs）。经过初步验证后，信天翁的位置可以通过地理定位来确定，平均误差为+/- SD 186 +/- 114 km（SD分别为1.66度和1.82度）。来自相同静态记录仪的误差较低（平均值± SD为85 ± 47 km，总体SD分别为0.61度和0.99度），变化较小，差异可归因于传感器方向的变化，羽毛的间歇性遮蔽，以及难以校正飞行鸟类的广泛，潜在的非线性运动。迭代平滑减少了平均误差和膨胀的核范围来自GLS数据，但过度平滑收缩的范围的极端。这减少了与对照数据中明显的径向核的重叠，并且对于多核GLS固定分布应避免。全球定位系统标签的准确性足以追踪中上层物种的迁徙和繁殖季节觅食范围，并确定大规模的生境偏好、重叠和与商业渔业的潜在冲突。
Geolocation (Global Location Sensing or GLS logging) using archival light-recording tags offers considerable potential for tracking animal movements, yet few studies of flying seabirds have exploited this technology. Our study evaluated its effectiveness for determining foraging ranges of black-browed albatrosses Thalassarche melanophrys fitted simultaneously with GLS loggers and satellite-transmitters (Platform Terminal Transmitters, PTTs). After some preliminary validation, the position of an albatross could be determined by geolocation with a mean error +/- SD of 186 +/- 114 km (SDs of 1.66degrees and 1.82degrees of latitude and longitude, respectively). Errors from identical static loggers were lower (mean +/- SD of 85 +/- 47 km, with overall SDs of 0.61degrees and 0.99degrees of latitude and longitude, respectively) and less variable, with the difference attributable to variation in sensor orientation, intermittent shading by plumage, and the difficulty of correcting for extensive, potentially non-linear movements of flying birds. Iterative smoothing reduced both the mean error and the inflation of kernel ranges derived from GLS data, but over-smoothing contracted the extremes of the range. This reduced the overlap with radial cores apparent in the control data, and should be avoided for multinuclear GLS fix distributions. The accuracy of GLS tags is more than adequate for tracking migration and breeding-season foraging ranges of pelagic species, and for identifying broad-scale habitat preferences, overlap and potential conflict with commercial fisheries.