Dam construction has created habitats and spawning or breeding grounds for fish, aquatic birds, and various other organisms. It is, therefore, necessary to identify dam conditions that are environmentally beneficial and stable for organisms, while basic dam functions, such as flood control and water utilization, are performed. This is achieved by monitoring the actual utilization of dams by various organisms; however, information on the utilization of dams by birds remains limited. This study examined the hunting sites of ospreys (Pandion haliaetus), the top predators in a dam ecosystem, and compared the environmental characteristics at these sites and at random sites. Ospreys hunted selectively in shallow areas of the reservoir and changed hunting grounds when there were water level fluctuations. In addition, some of the preferred shallow areas were created from sedimentation from rivers. These results show that shallow dam sites are important for ospreys. Furthermore, sedimentation, an undesirable factor in dam management, created hunting grounds for ospreys and, thus, should be considered in dam management decisions for maintaining the habitat and ecosystem for this species.

大坝建设为鱼类、水鸟和其他各种生物创造了栖息地和产卵或繁殖地。因此，有必要确定对环境有益且对生物体稳定的大坝条件，同时执行基本的大坝功能，例如防洪和水资源利用。这是通过监测各种生物对大坝的实际利用来实现的；然而，关于鸟类利用水坝的信息仍然有限。这项研究调查了鱼鹰的狩猎地点（Pandion haliaetus)，大坝生态系统中的顶级捕食者，并比较了这些地点和随机地点的环境特征。鱼鹰有选择地在水库的浅水区捕猎，并在水位波动时更换猎场。此外，一些首选的浅水区是由河流沉积形成的。这些结果表明浅水坝站点对鱼鹰很重要。此外，沉积是水坝管理中的一个不利因素，它为鱼鹰创造了狩猎场，因此在水坝管理决策中应考虑到，以维持该物种的栖息地和生态系统。