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Remnants of Native Vegetation Surrounding Do Not Affect the Diversity and Density of Birds in Brazilian Grassland-Restoration Sites
Frontiers in Ecology and Evolution ( IF 3 ) Pub Date : 2021-01-07 , DOI: 10.3389/fevo.2020.576705
Thaiane Weinert da Silva , Carla Suertegaray Fontana

Since in general the surrounding landscape influences the species diversity and abundance in fragments of native vegetation, an amount of native-vegetation cover nearby may also positively affect communities in restored areas, regardless of the sizes of individual habitat patches. We investigated for the first time whether the species richness, total abundance, and density of grassland birds in restoration sites are influenced by the amount of native grassland in the surrounding landscape in the Brazilian Pampa. We sampled birds by point counts in five restoration sites in the most representative area of grasslands in Brazil. We established an outer buffer zone with a 1 km-radius around the point-count areas in each site, and calculated the percentage of native grassland vegetation in the surrounding landscape. Bird species richness and abundance did not show a significant response to the amount of neighboring native grassland in restored areas. Individual analyses of the density of seven bird species associated to grassland also showed similar pattern. We believe the vegetation structure in these restoration sites may already been sufficiently re-established to provide necessary resources and a suitable habitat for the birds. Even so, we assume that previously existing landscape features were important for recovery of the vegetation structure, as continuous native grassland in the surroundings. Thus, we recommend consider the landscape context as an additional issue in studies dealing with conservation strategies for recovery of grasslands in Brazil.

中文翻译:

周围原生植被的残余不影响巴西草原恢复区鸟类的多样性和密度

由于周围景观通常会影响原生植被碎片的物种多样性和丰度,因此附近的大量原生植被覆盖也可能对恢复区域的群落产生积极影响,无论个体栖息地斑块的大小如何。我们首次调查了恢复地点草地鸟类的物种丰富度、总丰度和密度是否受巴西潘帕草原周围景观中原生草地数量的影响。我们在巴西最具代表性的草原区域的五个恢复地点按点数对鸟类进行了采样。我们在每个站点的点数区域周围建立了一个半径为 1 km 的外部缓冲区,并计算了周围景观中原生草地植被的百分比。鸟类物种丰富度和丰度对恢复区域中邻近原生草地的数量没有表现出显着的响应。对与草原相关的七种鸟类密度的个别分析也显示出类似的模式。我们相信这些恢复地点的植被结构可能已经得到充分重建,可为鸟类提供必要的资源和合适的栖息地。即便如此,我们假设先前存在的景观特征对于植被结构的恢复很重要,作为周围连续的原生草地。因此,我们建议在处理巴西草原恢复保护策略的研究中将景观背景作为一个额外的问题。对与草原相关的七种鸟类密度的个别分析也显示出类似的模式。我们相信这些恢复地点的植被结构可能已经得到充分重建,可为鸟类提供必要的资源和合适的栖息地。即便如此,我们假设先前存在的景观特征对于植被结构的恢复很重要,作为周围连续的原生草地。因此,我们建议在处理巴西草原恢复保护策略的研究中将景观背景作为一个额外的问题。对与草原相关的七种鸟类密度的个别分析也显示出类似的模式。我们相信这些恢复地点的植被结构可能已经得到充分重建,可为鸟类提供必要的资源和合适的栖息地。即便如此,我们假设先前存在的景观特征对于植被结构的恢复很重要,作为周围连续的原生草地。因此,我们建议在处理巴西草原恢复保护策略的研究中将景观背景作为一个额外的问题。我们相信这些恢复地点的植被结构可能已经得到充分重建,可为鸟类提供必要的资源和合适的栖息地。即便如此,我们假设先前存在的景观特征对于植被结构的恢复很重要,作为周围连续的原生草地。因此,我们建议在处理巴西草原恢复保护策略的研究中将景观背景作为一个额外的问题。我们相信这些恢复地点的植被结构可能已经得到充分重建,可为鸟类提供必要的资源和合适的栖息地。即便如此,我们假设先前存在的景观特征对于植被结构的恢复很重要,作为周围连续的原生草地。因此,我们建议在处理巴西草原恢复保护策略的研究中将景观背景作为一个额外的问题。
更新日期:2021-01-07
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