Seasonal changes in the local distribution of Yangtze finless porpoises related to fish presence
Seasonal changes in the local distribution of Yangtze finless porpoises related to fish presence
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DOI：
10.1111/j.1748-7692.2011.00490.x
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发表时间：
2012-04-01
影响因子：
2.3
通讯作者：
Arai, Nobuaki
中科院分区：
文献类型：
--
作者：
Kimura, Satoko;Akamatsu, Tomonari;Arai, Nobuaki
长江江豚（Neophocaena asiaeorientalis asiaeorientalis）是长江流域特有的濒临灭绝的淡水江豚亚种。当地动物分布的季节变化，以及鱼类存在、挖沙、船舶航行和桥梁作为影响动物发生的潜在因素进行了研究。2007年5月至2010年8月，在长江与鄱阳湖汇合处定期进行被动声学调查。江豚的分布随季节而异。在5月和8月，在河流交汇处发现的动物比在湖中发现的多，但从11月到2月反之亦然。鼠海豚的检出率在有鱼的地区明显高于没有鱼的地区。在2008年的禁沙期和挖沙作业期间，鼠海豚的数量并无显著差异，但渔船的数量在2008年明显下降。船舶交通和桥梁似乎也没有影响江豚的存在。这些结果表明了各种环境因素的相对重要性，这不仅对长江江豚的保护，而且对濒临灭绝的孤立鲸类的保护都具有重要意义。
The Yangtze finless porpoise (Neophocaena asiaeorientalis asiaeorientalis) is an endangered freshwater porpoise subspecies unique to the Yangtze River basin. Seasonal variations in local distribution of the animal, as well as fish presence, sand dredging, ship navigation, and bridges were examined as potential factors affecting the occurrence of the animals. Passive acoustic surveys were performed regularly from May 2007 to August 2010, near the conjunction of the Yangtze River and Poyang Lake. The distribution of the porpoises was seasonally site-specific. In May and August, the animals were detected more often at river junctions than in the lake, but vice versa from November to February. The rate of the porpoise detection was significantly higher in areas of fish presence than in areas of absence. The number of porpoises detected did not differ significantly between the sand dredging operation and the prohibition period (in 2008), although the number of vessels obviously declined in 2008. Ship traffic and bridges also did not appear to affect the presence of porpoises. These results showed the relative importance of the various environmental factors, which is important for conservation of not only Yangtze finless porpoise but also endangered isolated cetaceans.