Relationship between age and method of population estimation and the impact of changes in range-size maps on the IUCN Red List assessments of birds

IF 1.5 4区 环境科学与生态学 Q3 BIODIVERSITY CONSERVATION
David A. Wiedenfeld, Marcelo F. Tognelli
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Abstract

Population size is one component of several criteria in the International Union for Conservation of Nature (IUCN) Red List of Threatened Species (Red List). For these criteria, the quality of the population estimation can therefore have significant impact on the assessed status. To evaluate population estimate quality, we selected 473 species of land birds from the Americas considered by the Red List to be “Critically Endangered”, “Endangered”, or “Vulnerable” at the end of 2021, of which 414 (88%) had a population size estimate. For these species, we determined the age of the estimate and how the population estimate was derived, grouped into eight categories. For 87 species (18%) the population estimate was derived by sampling a small area and extrapolating to the entire range of the species; for these, the population size estimate depends on the estimate of range size. For the subset of 22 of these with complete data, we compared range size estimates obtained from maps published by IUCN with maps produced using the methods of Huang et al. (2021) to see how range map differences could affect population size estimates and therefore Red List status. Potentially half of these species (11 of 22) could change status using the new maps. More than one-third of the population size estimates (38%, 161 species with a date of population estimate) were made in 2000 or earlier. A majority of the species, 63% (300 of 473 species), do not have population size estimates made using a scientific sampling method, although the majority since 2010 have been made using a sampling method, reflecting an effort by Red List assessors to include more scientific information. We encourage the ornithological community to work to obtain current, high quality population size and range estimates to improve the quality of Red List status assessments.

年龄与种群数量估算方法之间的关系,以及分布区大小图的变化对《世界自然保护联盟》鸟类红色名录评估的影响
种群数量是世界自然保护联盟(IUCN)濒危物种红色名录(红色名录)中若干标准的组成部分之一。因此,对于这些标准而言,种群估计的质量会对评估的状况产生重大影响。为了评估种群数量估计的质量,我们从美洲选择了 473 种被红色名录认为在 2021 年底属于 "极度濒危"、"濒危 "或 "易危 "的陆地鸟类,其中 414 种(88%)有种群数量估计。对于这些物种,我们确定了估算的年代以及种群数量估算的得出方式,并将其分为八类。对于 87 个物种(18%),其种群数量估计值是通过小范围取样并推断至整个物种分布区得出的;对于这些物种,其种群数量估计值取决于对分布区大小的估计。对于其中 22 个有完整数据的子集,我们比较了从世界自然保护联盟(IUCN)发布的地图中获得的分布区大小估计值和用 Huang 等人(2021 年)的方法绘制的地图,以了解分布区地图的差异会如何影响种群大小估计值,进而影响红色名录的地位。这些物种中有一半(22 种中的 11 种)可能会因为使用新地图而改变地位。超过三分之一的种群数量估计(38%,161 个有种群估计日期的物种)是在 2000 年或更早的时候进行的。大多数物种(63%,473 种中的 300 种)的种群数量估计没有采用科学的抽样方法,不过自 2010 年以来,大多数物种的种群数量估计都采用了抽样方法,这反映了红色名录评估员为纳入更多科学信息所做的努力。我们鼓励鸟类学界努力获取最新的、高质量的种群数量和分布范围估计,以提高红色名录现状评估的质量。
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来源期刊
CiteScore
3.40
自引率
6.20%
发文量
50
审稿时长
>12 weeks
期刊介绍: Bird Conservation International is a quarterly peer-reviewed journal that seeks to promote worldwide research and action for the conservation of birds and the habitats upon which they depend. The official journal of BirdLife International, it provides stimulating, international and up-to-date coverage of a broad range of conservation topics, using birds to illuminate wider issues of biodiversity, conservation and sustainable resource use. It publishes original papers and reviews, including targeted articles and recommendations by leading experts.
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