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EAST ASIA

机译:东亚

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Interviews with Yangtze fishing communi-ties suggest that the Yangtze river dolphin or baiji did not undergo a range contrac- tion in the years leading up to its extinction. The baiji, which occupied the Yangtze channel and two nearby lakes, is the first large mammal to have been declared extinct for over 50 years. However, a data set of 406 last-sighting records of the species show that the species was still being seen across the middle and lower parts of the Yangtze channel and in one of the lakes in the decade before its extinction. This is significant because some of the IUCN's calculations of extinction risk take into account decline in range extent, and this new evidence demonstrates that mobile species such as the baiji may not show a decline in range even when hurtling towards extinction.
机译:对长江渔民的采访表明,长江海豚或白鳍豚在灭绝之前的几年中并未发生范围冲突。占领了长江通道和附近两个湖泊的白鳍豚是五十多年来被宣布灭绝的第一只大型哺乳动物。但是,该物种的406次最后观察记录的数据集显示,在灭绝前的十年中,仍在整个长江航道的中下部和一个湖泊中看到该物种。这是很重要的,因为世界自然保护联盟对灭绝风险的某些计算考虑了射程的下降,而这一新证据表明,即使是濒临灭绝的物种,如baiji,也不会显示射程的下降。

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    《Oryx》 |2010年第4期|p.472|共1页
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