尼泊尔亚热带保护区哺乳动物道路死亡的时空格局

IF 2.9 3区 环境科学与生态学 Q2 ECOLOGY
Ecosphere Pub Date : 2025-08-18 DOI:10.1002/ecs2.70383
Dayaram Pandey, Pemba Sherpa, Dipesh Kumar Sharma, Pratistha Shrestha, Gopal Khanal
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引用次数: 0

摘要

野生动物车辆碰撞是野生动物人为死亡的一个主要来源,因此了解其空间和时间格局对有效缓解至关重要。在这项研究中,我们对尼泊尔六个亚热带保护区在五年内(2017-2022年)记录的野生动物道路死亡事件进行了多地点、多年的分析。来自37种脊椎动物的618只个体动物在车辆碰撞中死亡,平均每10公里每年有5只动物在道路上死亡。道路死亡约占所有记录在案的野生动物死亡人数的27%,突出表明它是死亡的重要来源,对保护区野生动物的威胁日益严重。我们发现在道路死亡中有明显的分类偏差,有蹄类和灵长类动物占所有事故的65%。然而,在COVID-19封锁期间,食肉动物受到的影响尤为严重,这表明与交通状况的改变有关的风险可能发生变化。多尺度回归模型显示,道路死亡风险随着归一化植被指数(NDVI)、年降雨量和冠层盖度的增加而增加,在不同的分析尺度(100米、250米和500米缓冲带)上的影响是一致的。季节差异明显,道路死亡高峰在冬季,其次是秋季。在5年期间,道路死亡事件略有增加(3%),但趋势各不相同,6个保护区中有3个显示出增加趋势。重要的是,三个关键指标(总规模、杀伤率和时间趋势)并不一致;道路总杀伤数最多的保护区,其单位公里杀伤率不高,也没有上升趋势,但道路长度最短的保护区,其单位公里杀伤率呈上升趋势。这种不匹配可能反映了各种因素的复杂相互作用,包括道路长度和特定地点的因素。这一差异表明,保护区对道路死亡的脆弱性各不相同,强调需要针对每个指标和场地条件制定针对具体情况的缓解战略。随着尼泊尔道路网络的不断扩大,有针对性的研究和监测对于确定道路死亡热点、评估缓解效果以及为保护规划提供信息至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Spatial and temporal patterns of mammalian roadkill across subtropical protected areas in Nepal

Spatial and temporal patterns of mammalian roadkill across subtropical protected areas in Nepal

Spatial and temporal patterns of mammalian roadkill across subtropical protected areas in Nepal

Spatial and temporal patterns of mammalian roadkill across subtropical protected areas in Nepal

Spatial and temporal patterns of mammalian roadkill across subtropical protected areas in Nepal

Spatial and temporal patterns of mammalian roadkill across subtropical protected areas in Nepal

Wildlife–vehicle collisions are a major source of anthropogenic wildlife mortality, making it essential to understand their spatial and temporal patterns for effective mitigation. In this study, we conducted a multisite, multiyear analysis of wildlife roadkill incidents recorded across six subtropical protected areas in Nepal over a five-year period (2017–2022). A total of 618 individual animals from 37 vertebrate species were killed in vehicle collisions, averaging five roadkills per 10 km annually. Roadkill accounted for approximately 27% of all recorded wildlife mortalities, highlighting it as a significant source of mortality and a growing threat to wildlife in protected areas. We found a clear taxonomic bias in roadkill, with ungulates and primates accounting for ~65% of all incidents. However, during the COVID-19 lockdown, carnivores were disproportionately affected, suggesting a potential shift in risk linked to altered traffic conditions. Multiscale regression modeling showed that roadkill risk increased with Normalized Difference Vegetation Index (NDVI), annual rainfall, and canopy cover, with consistent effects across scales of analysis (100-, 250-, and 500-m buffers). Seasonal differences were evident, with peak roadkill in winter, followed by autumn. Roadkill incidents increased modestly (3%) over the five-year period, but trends varied, with three of six protected areas showing an increasing trend. Importantly, the three key metrics (total magnitude, kill rate, and temporal trend) did not align; the protected area with the highest number of total roadkill did not exhibit the highest kill rate per km or increasing trend, but the one with the shortest road length passing through its area experienced an increasing trend. This mismatch likely reflects a complex interplay of factors, including road length and site-specific factors. This variation suggests that protected areas vary in their vulnerability to roadkill, underscoring the need for context-specific mitigation strategies tailored to each metric and site condition. As Nepal's road network continues to expand, targeted research and monitoring will be essential for identifying roadkill hotspots, assessing mitigation effectiveness, and informing conservation planning.

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来源期刊
Ecosphere
Ecosphere ECOLOGY-
CiteScore
4.70
自引率
3.70%
发文量
378
审稿时长
15 weeks
期刊介绍: The scope of Ecosphere is as broad as the science of ecology itself. The journal welcomes submissions from all sub-disciplines of ecological science, as well as interdisciplinary studies relating to ecology. The journal''s goal is to provide a rapid-publication, online-only, open-access alternative to ESA''s other journals, while maintaining the rigorous standards of peer review for which ESA publications are renowned.
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