期刊
BIOLOGICAL CONSERVATION
卷 141, 期 12, 页码 3006-3018出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biocon.2008.09.005
关键词
River cetacean; Distribution; Endangered; Finless porpoise; (Neophocaena phocaenoides); Line transect
资金
- National Basic Research Program of China [2007CB411600]
- National Natural Science Foundation of China [30730018]
- Natural Environment Research Council [NE/D009456/1] Funding Source: researchfish
- NERC [NE/D009456/1] Funding Source: UKRI
middle and lower reaches of the Yangtze River, China. It is the only freshwater population of porpoises in the world and is currently listed as Endangered by IUCN. In November and December 2006 we used two boats and line transect methods to survey the entire current range of the population, except for two lakes (Poyang and Dongting). Sighting results were similar for both boats, so we pooled all data and analyzed them using two line transect models and a strip transect model. All models produced similar estimates of abundance (1111, 1225 and 1000). We then added independent estimates of the number of porpoises from the two lakes for a total estimate of approximately 1800 porpoises. Our findings indicate that the population continues to decline and that its distribution is becoming more fragmented. Our current estimate in the main river is slightly less than half the estimate from surveys between 1984 and 1991 (which was probably an underestimate). We also found an apparent gap in the distribution of porpoises between Yueyang and Shishou (similar to 150 km), where sightings had previously been common. Continued threats to Yangtze finless porpoises include bycatch in unregulated and unselective fishing, habitat degradation through dredging, pollution and noise, vessel strikes and water development. Immediate protective measures are urgently needed to ensure the persistence of finless porpoises in the Yangtze River. The survey design and analytical methods developed in this study might be appropriate for surveys of cetaceans in other river systems. (c) 2008 Elsevier Ltd. All rights reserved.
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