西部角雉的大范围和区域分布及干扰对当地丰度的影响

IF 1.5 4区 环境科学与生态学 Q3 BIODIVERSITY CONSERVATION
Akbar Shah, A. R. Kayani, F. Ihlow, M. Nadeem, T. Mahmood, S. Islam, Alexander E. Hausmann, M. Päckert
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引用次数: 1

摘要

摘要西Tragopan Tragopan黑色素头龙是喜马拉雅山脉西部的特有物种,目前在国际自然保护联盟红色名录中被列为“易危”物种,该名录还强调了其分布和种群规模方面的数据不足。通过这项研究,我们提供了来自巴基斯坦北部帕拉斯山谷的新数据,并根据环境生态位模型对物种当前、过去和未来的潜在分布进行了广泛的估计。在帕拉斯山谷,西Tragopans在朝北的斜坡上占据不同的夏季栖息地,在朝南的斜坡上则占据不同的冬季栖息地。根据两个繁殖季节(2017年4月和2018年5月)的个体呼叫计数调查推断出六边山谷当地人口的定量估计,并根据问卷中提供的当地人信息评估干扰因素。广义线性模型(GLM)显示了干扰因素对西部Tragopans的显著影响,即当地的丰度随着牲畜、采集者和猎人对该地区的干扰增加而下降。这种影响在调查年份以及朝南和朝北的斜坡上都很明显。虽然已知的西特拉戈潘分布范围较小且分散,但我们的生态位模型推断喜马偕尔邦和巴基斯坦西北部之间的气候适宜空间更为连续。考虑到物种对干扰的敏感性,这些发现表明,观测到的当前范围的碎片化也可能归因于栖息地转换或人为干扰,而不是气候适宜性。在上一次冰川盛期(LGM)期间,黑头T.blackcephalus可能仅限于小型森林避难所,而对11个未来气候模拟的预测是不确定的,大多数人认为黑头T.melcephalus的气候适宜空间可能会因应人为气候变化而扩大。总之,我们建议在规划未来的保护措施时,应考虑到该物种对人为干扰的敏感性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Range-wide and regional distribution of the Western Tragopan Tragopan melanocephalus and effects of disturbance on local abundances
Summary The Western Tragopan Tragopan melanocephalus is endemic to the Western Himalayas and currently listed as ‘Vulnerable’ on the IUCN Red List which also emphasizes a data deficiency regarding its distribution and population size. With this study we provide new data from the Palas Valley, northern Pakistan and deliver a range wide estimate of the species current, past, and future potential distribution as derived from environmental niche models. In the Palas Valley, Western Tragopans occupied different summer habitats on north-facing slopes and winter habitats on south-facing slopes. A quantitative estimate of local populations in six side valleys was inferred from individual call-count surveys during two breeding seasons (April and May 2017, 2018) and disturbance factors were evaluated from information of local people provided in questionnaires. Generalized-linear models (GLMs) showed a significant effect of disturbance factors on Western Tragopans, i.e. local abundances decreased with increasing disturbance from livestock, collectors and hunters visiting the area. This effect was visible across survey years and at both, south- as well as north-facing slopes. While the known distributional range of the Western Tragopan is small and fragmented, our niche models inferred climatically suitable space between Himachal Pradesh and northwestern Pakistan to be more continuous. Given the species sensitivity to disturbance, these findings indicate that the observed fragmentation of the current range might also be attributed to habitat transformation or anthropogenic disturbance rather than climatic suitability. During the Last Glacial Maximum (LGM) T. melanocephalus was probably restricted to small forest refugia, whereas projections onto eleven future climate simulations were inconclusive with the majority suggesting that climatically suitable space for T. melanocephalus will likely expand in response to anthropogenic climate change. In conclusion, we recommend that future conservation measures should be planned with regard to the species’ sensitivity to anthropogenic disturbances.
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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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