Road counts reveal The Gambia’s West Coast region still has the densest population of Hooded Vultures Necrosyrtes monachus in Africa

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2022-12-15 DOI:10.2989/00306525.2022.2143922
Mawdo Jallow, Momodou L Dibba, Fagimba Camara, D. Barber, K. Bildstein, Lindy J. Thompson
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Abstract

Road surveys are a useful tool for comparing vulture population trends. Here we present data from road surveys to count Hooded Vultures Necrosyrtes monachus in The Gambia in 2017 and 2021. In the first nationwide road survey in November 2017 (during this species’ breeding period), we counted 7.3 Hooded Vultures per km. In The Gambia’s West Coast, we counted 33.3 Hooded Vultures per km in November 2017 (during this species’ breeding period) and 27.4 Hooded Vultures per km in May 2021 (during the non-breeding period). In the rest of the country (i.e. in The Gambia’s North Bank, Central, Upper and Lower River regions), we counted 3.3 Hooded Vultures per km in November 2017 and 2.1 Hooded Vultures per km in November 2021, which may represent cause for concern. These figures for The Gambia’s West Coast region far exceed the results of road surveys conducted in the same area in 2005, 2013, and 2015. The number of Hooded Vultures recorded per km in the West Coast region increased from 2005 to 2017, but dipped slightly into May 2021, when we would have expected to see an increase, as the 2021 survey was carried out in the non-breeding period. In the non-breeding period vultures would not be confined to nests and populations should be at their highest, due to recently fledged juveniles entering the population. Overall, the densities of Hooded Vultures counted in The Gambia from 2005 to 2021 indicate that population densities are higher in The Gambia than in any other country where road surveys have taken place. The densities were orders of magnitude higher than those in eastern and southern Africa. However, given the decline in numbers between 2017 and 2021, we should not be complacent about the stability of this population.
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道路统计显示,冈比亚西海岸地区仍然是非洲秃鹫最密集的地区
道路调查是比较秃鹫数量趋势的有用工具。在这里,我们展示了2017年和2021年冈比亚对连帽秃鹫(necrosytes monachus)进行道路调查的数据。在2017年11月(该物种的繁殖期)的第一次全国道路调查中,我们发现每公里有7.3只秃鹫。在冈比亚西海岸,我们在2017年11月(在该物种的繁殖期)统计了每公里33.3只连头秃鹫,在2021年5月(在非繁殖期)统计了每公里27.4只连头秃鹫。在该国其他地区(即冈比亚北岸、中部、上游和下游地区),我们在2017年11月统计到每公里3.3只连帽秃鹫,在2021年11月统计到每公里2.1只连帽秃鹫,这可能是令人担忧的原因。冈比亚西海岸地区的这些数据远远超过了2005年、2013年和2015年在同一地区进行的道路调查的结果。从2005年到2017年,西海岸地区每公里记录的秃鹫数量有所增加,但在2021年5月略有下降,因为2021年的调查是在非繁殖期进行的,所以我们预计会看到增加。在非繁殖期,秃鹫不会被限制在巢穴中,由于最近羽翼丰满的幼鹰进入了种群,秃鹫的数量应该处于最高水平。总体而言,2005年至2021年在冈比亚统计的秃鹫密度表明,冈比亚的人口密度高于任何其他进行道路调查的国家。密度比非洲东部和南部的要高几个数量级。然而,考虑到2017年至2021年期间数量的下降,我们不应该对这一人口的稳定感到自满。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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