Understanding patterns of species diversity and distribution is crucial for the development of adequate public conservation policies. Despite the conservation value of mangroves, we still have a limited understanding of the influence of the habitat characteristics and patch connectivity of mangroves on bird species composition and diversity at local and regional scales. Here we used 40 point counts in six mangroves in southern Brazil to test the effects of landscape connectivity and habitat characteristics on the composition and diversity of mangrove bird communities. We measured environment variables locally and calculated land cover to describe the landscapes in which the patches of mangrove habitat were inserted. We also generated spatial variables as proxies for connectivity. We found that local bird species richness was similar in the different mangroves, ranging from 22 to 33 species, but with more species being found in larger patches. The partitioning of the beta diversity revealed a high species turnover, indicating that each patch of mangrove contributes different species to the regional pool of 57 species. Variance partitioning analysis also indicated that the composition of the mangrove bird metacommunity is driven mainly by local patch dynamics, whereas habitat characteristics and connectivity had a minor influence. These findings indicate that the maintenance of multiple large patches of mangrove at a regional scale will ensure a high species turnover and is the key to the maintenance of a diverse regional biota.

中文翻译：

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当地物种的周转增加了红树林中区域鸟类的多样性

了解物种多样性和分布方式对于制定适当的公共保护政策至关重要。尽管有红树林的保护价值，但我们对红树林的栖息地特征和斑块连通性对鸟类物种组成和区域和区域尺度的影响的了解仍然有限。在这里，我们使用了巴西南部6个红树林中的40个点来测试景观连通性和栖息地特征对红树林鸟类群落组成和多样性的影响。我们在本地测量了环境变量并计算了土地覆盖率，以描述插入了红树林栖息地的景观。我们还生成了空间变量作为连接的代理。我们发现，在不同的红树林中，本地鸟类物种的丰富度相似，范围从22到33种，但是在较大的斑块中发现的物种更多。β多样性的划分显示出较高的物种周转率，这表明红树林的每个斑块为57种物种的区域库贡献了不同的物种。方差划分分析还表明，红树林鸟类群落的组成主要由局部斑块动力学驱动，而栖息地的特性和连通性影响较小。这些发现表明，在区域范围内维护多个大片红树林将确保较高的物种周转率，这是维护多样化的区域生物群的关键。β多样性的划分显示出较高的物种周转率，这表明红树林的每个斑块为57种物种的区域库贡献了不同的物种。方差划分分析还表明，红树林鸟类群落的组成主要由局部斑块动力学驱动，而栖息地的特性和连通性影响较小。这些发现表明，在区域范围内维护多个大片红树林将确保较高的物种周转率，这是维护多样化的区域生物群的关键。β多样性的划分显示出较高的物种周转率，这表明红树林的每个斑块为57种物种的区域库贡献了不同的物种。方差划分分析还表明，红树林鸟类群落的组成主要由局部斑块动力学驱动，而栖息地的特性和连通性影响较小。这些发现表明，在区域范围内维护多个大片红树林将确保较高的物种周转率，这是维护多样化的区域生物群的关键。方差划分分析还表明，红树林鸟类群落的组成主要由局部斑块动力学驱动，而栖息地的特性和连通性影响较小。这些发现表明，在区域范围内维护多个大片红树林将确保较高的物种周转率，这是维护多样化的区域生物群的关键。方差划分分析还表明，红树林鸟类群落的组成主要由局部斑块动力学驱动，而栖息地的特性和连通性影响较小。这些发现表明，在区域范围内维护多个大片红树林将确保较高的物种周转率，这是维护多样化的区域生物群的关键。