Spatial overlap between the intermediate egret Egretta intermedia and its aquatic prey at two spatiotemporal scales in a rice paddy landscape
Spatial overlap between the intermediate egret Egretta intermedia and its aquatic prey at two spatiotemporal scales in a rice paddy landscape
复制标题
稻田景观中两种时空尺度的中间白鹭 Egretta intermedia 与其水生猎物的空间重叠
作者：
Naoki Katayama;Tatsuya Amano;G. Fujita;H. Higuchi
在多个时空尺度上量化捕食者和猎物之间的空间重叠模式可能是理解分层捕食者-猎物相互作用的有用方法。迄今为止，许多实证研究仅关注除远洋海洋系统之外的精细空间尺度（小于几公顷）。此外，捕食者-被捕食者重叠的时间尺度很少被探索。本研究调查了日本中部稻田景观中白鹭 Egretta intermedia 及其水生猎物在 2 个尺度上的空间重叠。在广阔的空间尺度上（超过几公顷），在5月下旬至6月下旬的洪水期间，采用传统灌溉方式的稻田地区的白鹭及其猎物往往比采用现代灌溉方式的稻田地区更为丰富。在更精细的尺度上，每个稻田中白鹭的丰度与其猎物之间仅在几天的较短时间尺度上存在正空间相关性。这些结果表明，稻田景观中的分层捕食者-被捕食者相互作用是由在不同时空尺度上运行的多个过程引起的。
Quantification of patterns of spatial overlap between predators and prey at multiple spatiotemporal scales can be a useful approach to understanding hierarchical predator-prey interactions. To date, many empirical studies have focused on only fine spatial scales (less than a few hectares) except in pelagic marine systems. Furthermore, the temporal scale of predator-prey overlap has rarely been explored. This study investigated spatial overlaps between the Intermediate Egret Egretta intermedia and its aquatic prey at 2 scales in a rice paddy landscape in central Japan. At a broad spatial scale (more than several hectares), both the egrets and their prey tended to be more abundant in the area of rice fields using traditional irrigation practices than in the area of fields using modern practices, during the flooding periods from late May to late June. At a finer scale, there was a positive spatial correlation between abundances of egrets and their prey in each rice field only at the short temporal scale of a few days. These results suggest that hierarchical predator-prey interactions in rice paddy landscapes are caused by several processes operating at different spatiotemporal scales.
影响因子：
2.4
作者：
Naoki Katayama;Daigo Saitoh;Tatsuya Amano;T. Miyashita
通讯作者：
Naoki Katayama;Daigo Saitoh;Tatsuya Amano;T. Miyashita