辽东湾北部双台子河口的斑海豹

2003年3月至4月及2004年3月至5月。对辽东湾北部双台子河口附近的斑海豹栖息地及斑海豹资源进行了调查。斑海豹数量和行为的观察采用海上目视直接观察及照相计数方法；栖息地的环境调查为现场结合社会调查。结果发现：斑海豹的栖息地十年来位置未改变，仍在距人海口10km处的一段河岸，但其生态环境正遭到破坏。斑海豹在该栖息地的分布时间从3月初辽东湾冰融起至5月中旬；高峰期在3月底至4月中旬之间；4月中旬斑海豹开始离开，比十年前提早半个月左右；5月中旬以后。斑海豹基本上全部离开此处。另外，斑海豹的个体数：2003年为105头。而2004年则为40头。其数量年变化较大。

Spotted seals in the Estuary of Shuangtaizi River of Liaodong Bay

The surveys for the environmental conditions and the dynamics of Spotted seals in the Estuary of Shuangtaizi River were carried out in the period of Mar to Apr of 2003 and Mar to May of 2004. The direct observation of dynamics and behavior of spotted seals were carried out by a telescope and photograph counting on boat. The results showed that the haul sites of spotted seals were still located in the same bank as ten years ago, but the ecological environments were deteriorated. The period of spotted seals appearing in this area was from the melting of the ice in Liaodong Bay, generally at the beginning of Mar to the mid of May. The high density of spotted seals was from late of Mar to the mid of April. The spotted seal started to leave at the mid of April, about half month earlier than ten years ago, and left completely at the mid of May. Besides, the maximum numbers of spotted seals were 105 and 40 in 2003 and 2004, respectively, which showed the obvious annual change.