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Effectiveness of crossings as wildlife passages for mammals in the Yungas of Argentina
Journal for Nature Conservation ( IF 2 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.jnc.2020.125944
Johan Baechli , Sebastián Albanesi , Laura M. Bellis

Abstract Irrigation canals are an important cause of wild mammal mortality in the Piedmont forest of the Argentine Yungas. To improve the permeability of this infrastructure, specific wildlife crossings were added to the existing non-wildlife crossings built for other purposes. However, the effectiveness of these wildlife-specific crossings has still not been evaluated. Here, we identified the mammalian species that use the crossings, determined the global frequency of use of each crossing through a use index, and evaluated the possible predilection of a species for a particular crossing type using species-specific models. We found that 50% of species in the study area used the crossings. The highest percentages of use corresponded to tapeti (Sylvilagus brasiliensis, 25.4%), lowland tapir (Tapirus terrestris, 21.5%), agouti (Dasyprocta punctata, 20.7%), crab-eating fox (Cerdocyon thous, 9.1%) and tayra (Eira barbara, 6.3%).The global model shows that crossing type, openness and vegetation vertical structure were the best predictors of crossing use. Species-specific models show in general that variables related to the structure of the crossings were better able to explain animal movement. The dry season increased the use of the crossings. We concluded that the presence of both wildlife-specific and non-wildlife-specific crossings would contribute to reducing the barrier effect and, therefore, to mammal conservation. In this connection we recommend that simple, low-cost wildlife-specific crossings be taken into account.

中文翻译:

穿越作为阿根廷永加斯哺乳动物野生动物通道的有效性

摘要 灌溉渠是阿根廷永加斯山麓森林野生哺乳动物死亡的重要原因。为了提高该基础设施的渗透性,在现有的为其他目的而建造的非野生动物过境点中增加了特定的野生动物过境点。然而,这些特定于野生动物的杂交的有效性仍未得到评估。在这里,我们确定了使用杂交的哺乳动物物种,通过使用指数确定每个杂交的全球使用频率,并使用物种特定模型评估物种对特定杂交类型的可能偏好。我们发现研究区域中 50% 的物种使用了杂交。使用率最高的是貘(Sylvilagus brasiliensis,25.4%)、低地貘(Tapirus terrestris,21.5%)、刺豚鼠(Dasyprocta punctata,20.7%)、食蟹狐 (Cerdocyon thous, 9.1%) 和 tayra (Eira barbara, 6.3%)。全球模型表明,交叉类型、开放度和植被垂直结构是交叉使用的最佳预测因子。物种特异性模型通常表明,与杂交结构相关的变量能够更好地解释动物运动。旱季增加了过境点的使用。我们得出的结论是,野生动物特异性和非野生动物特异性杂交的存在将有助于减少屏障效应,从而有助于哺乳动物保护。在这方面,我们建议考虑简单、低成本的野生动物特定穿越。开放度和植被垂直结构是交叉使用的最佳预测指标。物种特异性模型通常表明,与杂交结构相关的变量能够更好地解释动物运动。旱季增加了过境点的使用。我们得出的结论是,野生动物特异性和非野生动物特异性杂交的存在将有助于减少屏障效应,从而有助于哺乳动物保护。在这方面,我们建议考虑简单、低成本的野生动物特定穿越。开放度和植被垂直结构是交叉使用的最佳预测指标。物种特异性模型通常表明,与杂交结构相关的变量能够更好地解释动物运动。旱季增加了过境点的使用。我们得出的结论是,野生动物特异性和非野生动物特异性杂交的存在将有助于减少屏障效应,从而有助于哺乳动物保护。在这方面,我们建议考虑简单、低成本的野生动物特定穿越。我们得出的结论是,野生动物特异性和非野生动物特异性杂交的存在将有助于减少屏障效应,从而有助于哺乳动物保护。在这方面,我们建议考虑简单、低成本的野生动物特定过境点。我们得出的结论是,野生动物特异性和非野生动物特异性杂交的存在将有助于减少屏障效应,从而有助于哺乳动物保护。在这方面,我们建议考虑简单、低成本的野生动物特定穿越。
更新日期:2021-02-01
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