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Individual and demographic responses of a marsh bird assemblage to habitat loss and subsequent restoration

机译：沼泽鸟集中到栖息地损失和随后恢复的个人和人口统计响应

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BackgroundThe alteration and loss of habitats are two of the main threats that biodiversity conservation is currently facing up to. The present study describes the effects of a perturbation and restoration in a reedbed habitat on a bird assemblage. We studied the bird community of a wetland of central Spain between 1995 and 2009, during which time an anthropic perturbation altered the original structure of the habitat; subsequently, as a result of restoration works, the habitat returned to its original state.MethodsWe evaluated the effects on six population and physical parameters of the birds at three different phases of their life cycles (breeding, wintering and post-breeding migration seasons) before, during and after the habitat alteration. GLM was used to analyze the influence of three independent variables (year, perturbation phase and temperature).ResultsThe relative abundance and the species richness values decreased when habitat was altered, but then recovered as a result of the regeneration works. This pattern was the clearest amongst specialist species. Breeding success also declined during the perturbation phase and then increased; likewise, the sex ratio changed given that the proportion of male birds increased when habitat was altered. These results are discussed in relation to changes on availability of resources in altered habitats, to the adaptive mechanisms in the exploitation of ecological requirements and to the selection of optimum and sub-optimum habitats by generalist and specialist species.ConclusionsEcosystem restoration can favour the recovery of population indexes of specialist passerines, although it depends on the efficiency of the type of restoration activity performed and on the complexity of the habitat.
机译：背景技术生物多样性保护目前面临的两种主要威胁是的两个主要威胁。本研究描述了在鸟类组合中捕获和恢复扰动和恢复的影响。我们研究了1995年至2009年间西班牙中部湿地的鸟群，在此期间，人类扰动会改变了栖息地的原始结构;随后，由于恢复工作，栖息地返回其原始态度。近奇地区评估了在其生命周期（繁殖，越冬和育种后迁徙季节）的三个不同阶段的六种种群和鸟类物理参数的影响在栖息地改变期间和之后。 GLM用于分析三个独立变量（年，扰动阶段和温度）的影响这种模式是专家物种中最清晰的。在扰动阶段，育种成功也下降，然后增加;同样，性别比例改变了，当栖息地改变时，雄性鸟类的比例增加。这些结果是关于改变改变栖息地资源可用性的变化，以利用生态要求的自适应机制以及通过通用和专业物种选择最佳和次优栖息地的自适应机制.Conclusionsecosystem恢复可以赞成恢复专家普通人的人口指标，但这取决于所做的恢复活动类型的效率和栖息地的复杂性。

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