A review of the conservation status of Black Stork Ciconia nigra in South Africa, Lesotho, and Eswatini

IF 1.5 4区 环境科学与生态学 Q3 BIODIVERSITY CONSERVATION
Alan Tristram Kenneth Lee, M. A. Whitecross, H. Smit-Robinson, D. Allan, L. van den Heever, A. Jenkins, E. Retief, R. Colyn, W. Tarboton, Kishaylin Chetty, C. W. Brink
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引用次数: 1

Abstract

Summary Across South Africa, Lesotho, and Eswatini, long-term citizen science atlas data have suggested concerning declines in the population of Black Stork Ciconia nigra. Unlike the Asian and European populations, the southern African Black Stork population is described as resident and is listed as “Vulnerable” in South Africa, Lesotho, and Eswatini. Here we report on surveys of historical nesting locations across northern South Africa, finding evidence for nest site abandonment and limited evidence of recent breeding. We undertook detailed species distribution modelling within a maximum entropy framework, using occurrence records from the BirdLasser mobile app. We cross-validated the models against information in the Southern African Bird Atlas Project (SABAP2) database, highlighting Lesotho as an important potential breeding area. Additionally, we used SABAP2 to assess population trends by investigating interannual patterns in reporting rate. Comparing current reporting rates with those from SABAP1 (1987–1992), we found that there has been a dramatic decrease. We noted that a large proportion of the population occurs outside the breeding range during the breeding season, suggesting a considerable non-breeding population, especially in the extensive wildlife refuge of the Kruger National Park. The slow declines observed might be indicative of a population which is not losing many adults but is failing to recruit significant numbers of juveniles due to limited breeding. Using densities derived from transect surveys, we used predictive models to derive estimates of breeding range carrying capacity and a population estimate, which suggested declines to numbers around 600 for this subregion. Minimising disturbance at breeding sites of this cliff-nesting species and improving water quality at key population strongholds are pathways to improving the status of the species in the subregion.
南非、莱索托和斯威士兰黑鹳的保护现状综述
摘要在南非、莱索托和斯威士兰,长期的公民科学图谱数据表明,黑鹳的数量下降令人担忧。与亚洲和欧洲种群不同,南非黑鹳种群被描述为常驻种群,在南非、莱索托和斯威士兰被列为“易危”种群。在这里,我们报告了对南非北部历史筑巢地点的调查,发现了废弃巢穴的证据,以及最近繁殖的有限证据。我们使用BirdLasser移动应用程序的发生记录,在最大熵框架内进行了详细的物种分布建模。我们根据南部非洲鸟类图谱项目(SABAP2)数据库中的信息对模型进行了交叉验证,强调莱索托是一个重要的潜在繁殖区。此外,我们使用SABAP2通过调查报告率的年际模式来评估人口趋势。将目前的报告率与SABAP1(1987–1992)的报告率进行比较,我们发现报告率急剧下降。我们注意到,在繁殖季节,很大一部分种群出现在繁殖范围之外,这表明有相当多的非繁殖种群,尤其是在克鲁格国家公园的野生动物保护区。观察到的缓慢下降可能表明,该种群没有失去许多成年人,但由于繁殖有限,未能招募到大量的青少年。利用样带调查得出的密度,我们使用预测模型得出繁殖范围承载能力的估计值和种群估计值,这表明该次区域的数量下降到600左右。将这种悬崖筑巢物种繁殖地的干扰降至最低,并改善关键种群据点的水质,是改善该物种在该次区域地位的途径。
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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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