Suwa Hydrobiological Station, Faculty of Science, Shinshu University, 5-2-4 Kogan-dori, Suwa, Nagano, 392-0027, Japan.
Institute of Mountain Science, Shinshu University, 5-2-4 Kogan-dori, Suwa, Nagano, 392-0027, Japan.
Sci Rep. 2020 Mar 5;10(1):4118. doi: 10.1038/s41598-020-60141-z.
To maintain and recover populations of migratory waders, we must identify the important stopover sites and habitat use along migration routes. However, we have little such information for waders that depend on inland freshwater areas compared with those that depend on coastal areas. Recent technological developments in tracking devices now allow us to define habitat use at a fine scale. In this study, we used GPS loggers to track both spring and autumn migration along the East Asian-Australasian flyway of the little ringed plover (Charadrius dubius) as birds moved to and from their breeding grounds, gravel riverbeds in Japan. The birds we tracked overwintered in the Philippines and made stopovers mainly in Taiwan and the Philippines. The most important habitat during the non-breeding season was rice paddy fields. Our findings imply that changes in agriculture management policy in the countries along the migration route could critically affect the migration of waders that depend on rice paddy fields. To maintain populations of migrant inland waders that move within the East Asian-Australasian flyway, it is necessary not only to sustain the breeding habitat but also wetlands including the rice paddy fields as foraging habitat for the non-breeding season.
为了维持和恢复迁徙涉禽的数量，我们必须确定迁徙路线上重要的中途停留地点和栖息地利用情况。然而，与依赖沿海地区的涉禽相比，我们对依赖内陆淡水区域的涉禽知之甚少。跟踪设备的最新技术发展现在使我们能够在精细的尺度上定义栖息地的利用情况。在这项研究中，我们使用 GPS 日志记录器跟踪小环颈鸻（Charadrius dubius）春季和秋季沿东亚-澳大拉西亚飞行路线的迁徙情况，因为鸟类在繁殖地（日本的砾石河床）之间移动。我们跟踪的鸟类在菲律宾越冬，主要在台湾和菲律宾停留。非繁殖季节最重要的栖息地是稻田。我们的研究结果表明，迁徙路线沿线国家农业管理政策的变化可能会对依赖稻田的涉禽迁徙产生重大影响。为了维持在东亚-澳大拉西亚飞行路线内迁徙的内陆候鸟的数量，不仅需要维持繁殖栖息地，还需要维持包括稻田在内的湿地作为非繁殖季节的觅食栖息地。
