Avian biodiversity losses from grazing of high Andean páramo

Avian biodiversity losses from grazing of high Andean páramo
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安第斯高山放牧导致鸟类生物多样性丧失

DOI:
10.1016/j.biocon.2023.110298
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发表时间:
2023
影响因子:
5.9
通讯作者:
Mills S
Mills S
中科院分区:
环境科学与生态学1区
文献类型:
--
作者:
Mills S

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帕拉莫斯是北方安第斯山脉以高海拔草地为主的生态系统,拥有大量小范围和特有物种,提供重要的生态系统服务。虽然牧场越来越多地以保护为重点进行管理,但它们仍然受到生态威胁,部分原因是过度放牧。在这里,我们评估放牧对鸟类群落的影响,从三个páramo复杂的哥伦比亚东部安第斯山脉收集的数据。我们(1)评估密度的灌木和frailejones-一个关键组的植物在páramo-放牧的影响,(2)确定这些植被特征对鸟类占用的影响,(3)研究鸟类物种丰富度和群落组成是如何影响páramo放牧。我们发现,放牧状态强烈影响的植被特征的帕拉莫,导致大量减少灌木和frailejones的丰度。这些植被变化对帕拉莫鸟类群落产生了重大影响,灌木丰富度的减少导致大多数物种(48种中的4种)的占用率降低。因此,放牧的草原群落包含的鸟类种类较少,相对于自然草原的组成也有所不同。然而,这些差异的程度是适度的,低强度放牧可能仍然与保护管理兼容。我们建议,重要的是要考虑如何保护草原可能与管理相邻的山地森林和潜在的渗漏效应,导致增加保护区以外的森林砍伐。
Páramos are high-elevation grassland-dominated ecosystems of the northern Andes that harbour large numbers of small-ranged and endemic species and provide important ecosystem services. Though páramos are increasingly managed with a conservation focus, they remain ecologically threatened, in part due to overgrazing. Here, we assess the impacts of grazing on bird communities using data collected from three páramo complexes in the Eastern Andes of Colombia. We (1) assess how densities of shrubs and frailejones—a keystone group of plants in the páramo—are impacted by grazing, (2) determine the influence of these vegetation features on bird occupancy, and (3) examine how bird species richness and community composition are impacted by páramo grazing. We find that grazing status strongly influences the vegetation characteristics of the páramo, resulting in large reductions in the abundance of shrubs and frailejones. These vegetation changes have significant impacts on páramo bird communities, with reduced shrub abundance resulting in lower occupancy for most species (4 out of 48). As a consequence, grazed páramo communities contain fewer bird species and vary in composition relative to those of natural páramo. However, the magnitudes of these differences are modest and it is possible that low-intensity grazing remains compatible with conservation management. We suggest that it is important to consider how páramo conservation may interact with management of adjacent montane forests and the potential for leakage effects resulting in increased deforestation outside of protected areas.
放牧对委内瑞拉帕拉莫斯老田演替植被结构和植物物种丰富度的影响
DOI: --
发表时间: 2006
期刊:
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期刊: PloS one
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DOI: --
发表时间: 2021
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DOI: 10.1111/btp.12191
发表时间: 2015
期刊: Biotropica
影响因子: 2.1
作者:
J. Urbina;J. C. Benavides
通讯作者: J. C. Benavides