Habitat selection and population trends in terrestrial bird species of Robinson Crusoe Island: habitat generalists versus forest specialists

Habitat selection and population trends in terrestrial bird species of Robinson Crusoe Island: habitat generalists versus forest specialists
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鲁滨逊漂流岛陆生鸟类的栖息地选择和种群趋势:栖息地通才与森林专家

DOI:
10.1007/s10531-011-0109-x
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发表时间:
2011
影响因子:
3.4
通讯作者:
Römer
Römer
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Vergara;Römer

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海岛生境的丧失和退化是导致特有鸟类种群数量下降和促进入侵鸟类定居的关键过程。在这项研究中,在罗宾逊克鲁索岛进行,我们评估的密度和栖息地选择的陆地鸟类,包括胡安费尔南德斯火冠和胡安费尔南德斯山雀,两个地方性的,以及绿背火冠和南方画眉,这显然是来自大陆。结果表明,扰动栖息地包含了低密度的特有种,而大陆物种显着更丰富的扰动灌丛栖息地。鸟类物种表现出不同的栖息地选择模式,特有种选择原生林,大陆种选择扰动栖息地,或随机使用。鸟类物种的总体种群规模经历了时间趋势,1994年至2009年期间,地方性巨嘴鸟的种群规模大幅下降约63%。只有大陆物种的栖息地利用表现出时间的变化,显着降低其密度在首选的灌木栖息地,可能是作为一个响应栖息地质量下降。画眉显然能够补偿人口减少的一个非原生栖息地类型,利用原生森林,栖息地给他们的机会捕食的特有物种的巢穴。我们的结论是,在罗宾逊克鲁索岛,特有鸟类表现为专家,而大陆物种必须被视为入侵的多面手。
Habitat loss and degradation on oceanic islands are key processes leading to population decline of endemic birds and facilitating the establishment of invasive bird species. In this study, carried out in the Robinson Crusoe Island, we assessed density and habitat selection of terrestrial bird species, including juan fernandez firecrown and juan fernandez tit-tyrant, two endemics, as well as green-backed firecrown and austral thrush, which apparently originate from the mainland. Results show that perturbed habitats contained a low density of the endemic species whereas the mainland species were significantly more abundant in perturbed scrub habitats. Bird species show different habitat selection patterns, with endemics selecting for native forest and mainland species selecting for perturbed habitats, or using them at random. Bird species experienced temporal trends in their overall population sizes, with the endemic tit-tyrant suffering a significant decline in its population size of about 63% between 1994 and 2009. Only mainland species exhibited temporal changes in habitat use, significantly reducing their densities in the preferred scrub habitats, possibly as a response to decreased habitat quality. Thrushes apparently were able to compensate the population decrease in one non native habitat type by using native forests, a habitat giving them the opportunity of preying on nests of endemic species. We conclude that endemic bird species behave as specialists whereas the mainland species must be treated as invasive generalists on Robinson Crusoe Island.
鲁滨逊漂流记岛上的漂流者:引进物种对特有蜂鸟的影响
DOI: --
发表时间: 2009
期刊:
影响因子: --
作者:
E. Hagen
通讯作者: E. Hagen
样本大小、样地大小和计数时间对智利雨林鸟类多样性和丰富度估计的影响
DOI: --
发表时间: 2000
期刊:
影响因子: --
作者:
J. Jiménez
通讯作者: J. Jiménez
用于理解当前生物同质化情况下成分相似性变化的岛屿生物地理学方法
DOI: --
发表时间: 2011
期刊:
影响因子: --
作者:
P. Vergara;J. Pizarro;S. Castro
通讯作者: S. Castro
DOI: --
发表时间: 2005
期刊:
影响因子: --
作者:
Guillermo C. Amico;Marcelo A. Aizen
通讯作者: Marcelo A. Aizen
DOI: 10.1111/j.1461-0248.2004.00702.x
发表时间: 2005-01-01
期刊: ECOLOGY LETTERS
影响因子: 8.8
作者:
Clark, JS
通讯作者: Clark, JS