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Temporal changes in Mediterranean bird communities across fragmented and continuous forests

机译:遍布零散森林和连续森林的地中海鸟类群落的时间变化

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摘要

Habitat loss and fragmentation are recognized as the main causes for the global biodiversity crisis. Most of the studies investigating the issue of habitat fragmentation in vertebrates are cross-sectional, whereas long-term studies are least available. We surveyed bird communities in 17 forest fragments (FF) and a single continuous forest stands (CF) in central Italy twice, 10 years apart (i.e. in 1996 and in 2006). All community parameters showed a contrasting pattern between 1996 and 2006, i.e. an increase of abundance and diversity measures in CF and a decrease or a stability of the same parameters in FF. Insectivorous and migratory bird species were the most prone to population declines associated with fragmented landscapes. Differences in species turnover between CF and FF were due to a higher extinction rate in the latter forest type. There was substantial population increase between 1996 and 2006, especially in FF, of opportunistic predator species like corvids. This fact may be responsible for the observed dropping in species number, evenness and diversity in FF. Hence, we conclude that, in FF, the bird community is far from being either stabilized or resilient, as it is rapidly evolving into a more simplified assemblage, dominated by generalist species.
机译:生境的丧失和破碎化被认为是全球生物多样性危机的主要原因。大多数调查脊椎动物栖息地破碎问题的研究都是横断面的,而长期研究却很少。我们对意大利中部的17个森林碎片(FF)和单个连续林分(CF)的鸟类群落进行了两次调查,相隔10年(即1996年和2006年)。在1996年至2006年之间,所有群落参数均呈现出相反的模式,即CF中的丰度和多样性指标增加,而FF中相同参数的下降或稳定性。食虫性和迁徙性鸟类是最容易出现与零散景观相关的种群减少的物种。 CF和FF之间物种转换的差异是由于后一种森林类型中较高的灭绝率所致。在1996年至2006年之间,大量的机会性掠食性物种(如柯维人)的人口大量增加,尤其是在FF。这个事实可能是造成观察到的FF物种数量,均匀性和多样性下降的原因。因此,我们得出的结论是,在FF中,鸟类群落远未稳定或具有弹性,因为它正在迅速演变为以通才种为主的更简单的组合。

著录项

  • 来源
    《Ecological research》 |2015年第4期|615-624|共10页
  • 作者单位

    Reg Parks Agcy, Latium Reg, I-00166 Rome, Italy;

    DEMETRA, Inst Environm Studies, I-00198 Rome, Italy|Niger Delta Ecol & Biodivers Conservat Unit, Dept Environm, Port Harcourt, Rivers State, Nigeria|Rivers State Univ Sci & Technol, Dept Appl & Environm Biol, Port Harcourt, Nigeria;

    Marturanum Reg Pk, Latium Reg, I-01010 Barbarano Romano, VT, Italy;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Assembly rules; Community ecology; Diversity; Evenness; Fragmentation; Habitat loss;

    机译:大会规则;社区生态;多样性;平稳性;破碎化;生境丧失;

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