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首页> 外文期刊>Oryx >Current status of the threatened Dupont's lark Chersophilus duponti in Spain: overestimation, decline, and extinction of local populations
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Current status of the threatened Dupont's lark Chersophilus duponti in Spain: overestimation, decline, and extinction of local populations

机译：受威胁的杜邦百灵鸟杜邦（Chersophilus duponti）在西班牙的现状：对当地人口的高估，下降和灭绝

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The European population of Dupont's lark Chersophilus duponti, restricted to Spanish steppe, was estimated to be 13,000 pairs in c. 50 populations in 1988. There is, however, recent evidence that this number was overestimated because of the previous use of line transects for estimating population sizes. In 2002-2004 we surveyed 34 previously known local populations in patches of variable size across half of its Spanish distribution. We found 13 (38%) local populations to be extinct, and a total of only 283-339 territories in 17 of the extant populations, seven of which held <5 territories. This census contrasts dramatically with the estimate of c. 3,000 pairs in the same populations in the 1980s. We estimate that the present Spanish population is c. 1,300 pairs. The discrepancy between this and earlier estimates is partly but not entirely due to previous overestimations. Habitat loss due to ploughing, and possibly habitat degradation and the resulting stochastic extinction of small and isolated populations, have contributed to the species' decline. Urgent research is needed to design and manage an adequate network of steppe patches that will ensure the long-term existence of this species. We recommend that Dupont's lark be categorized on the IUCN Red List as Endangered, both globally and nationally within Spain.
机译：杜邦的百灵百鸟杜鹃花（Chersophilus duponti）在欧洲只限于西班牙草原，估计约有13,000对。 1988年有50个人口。但是，最近有证据表明，这个数字被高估了，因为以前使用线样线来估计人口规模。在2002年至2004年间，我们对34个先前已知的当地人口进行了调查，这些人口分布在西班牙分布的一半区域，大小各异。我们发现有13个（38％）本地人口灭绝，而在现有人口中的17个中，总共只有283-339个领土，其中有7个拥有不到5个领土。这次普查与c的估计值形成鲜明对比。在1980年代，同一人口中有3,000对。我们估计目前的西班牙人口为c。 1300对。此估计与先前估计之间的差异部分是但并非完全是由于先前的高估。由于耕作造成的栖息地丧失，以及可能的栖息地退化以及少数和孤立种群的随机灭绝，导致该物种的减少。需要紧急研究以设计和管理足够的草原补丁网络，以确保该物种的长期存在。我们建议在西班牙和全球范围内，将杜邦的云雀在IUCN红色名录中列为濒危物种。

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