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首页> 外文期刊>Landscape Ecology >Using binary and probabilistic habitat availability indices derived from graph theory to model bird occurrence in fragmented forests. (Special Issue: Landscape connectivity analysis for conservation: insights from combining new methods with ecological and genetic data.)
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Using binary and probabilistic habitat availability indices derived from graph theory to model bird occurrence in fragmented forests. (Special Issue: Landscape connectivity analysis for conservation: insights from combining new methods with ecological and genetic data.)

机译：使用基于图论的二元和概率生境可用性指数来模拟零散森林中鸟类的发生。 （特刊：用于保护的景观连通性分析：将新方法与生态和遗传数据相结合得出的见解。）

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Loss of connectivity is one of the main causes of decreases in habitat availability and, thus, in species abundance and occurrence in fragmented landscapes. It is therefore important to measure habitat connectivity for conservation purposes, but there are several difficulties in quantifying connectivity, including the need for species movement behavioral data and the existence of few consistent indices to describe such data. In the present study, we used a graph theoretical framework to measure habitat availability, and we evaluate whether this variable is adequate to explain the occurrence pattern of an Atlantic rainforest bird (Pyriglena leucoptera, Thamnophilidae). The playback technique was used to parameterize the connectivity component of habitat availability indices and to determine the presence or absence of the study species in forest patches. Patch- and landscape-level habitat availability indices were considered as explanatory variables. Two of these were landscape-level indices, which varied in terms of how inter-patch connections are defined, using either a binary or probabilistic approach. This study produced four striking results. First, even short open gaps may disrupt habitat continuity for P. leucoptera. Second, the occurrence of P. leucoptera was positively affected by habitat availability. Third, proper measures of this explanatory variable should account for the landscape context around the focal patch, emphasizing the importance of habitat connectivity. Finally, habitat availability indices should consider probabilistic and not binary inter-patch connections when intending to explain the occurrence of bird species in fragmented landscapes. We discuss some conservation implications of our results, stressing the advantages of an ecologically scaled graph theoretical framework.
机译：连通性的丧失是栖息地可用性下降的主要原因之一，因此是物种丰富度和零散景观中发生的原因之一。因此，为了保护目的而测量栖息地的连通性很重要，但是在量化连通性方面存在一些困难，包括对物种运动行为数据的需求以及描述此类数据的一致性指标的存在。在本研究中，我们使用图论理论框架来衡量栖息地的可利用性，并评估该变量是否足以解释大西洋雨林鸟（ Pyriglena leucoptera ，Thamnophilidae）的发生模式。回放技术用于参数化栖息地可用性指数的连通性分量，并确定森林斑块中研究物种的存在与否。斑块和景观水平的生境可用性指数被视为解释性变量。其中两个是景观级别的索引，使用二进制或概率方法，它们在补丁间连接的定义方式方面有所不同。这项研究产生了四个惊人的结果。首先，即使是很小的开放间隙也可能破坏 P的生境连续性。白翅目。第二， P的发生。栖息地的可用性对白鳞纲产生了积极的影响。第三，对该解释变量进行适当的测量应说明焦点斑块周围的景观背景，强调栖息地连通性的重要性。最后，当要解释零散的景观中鸟类的发生时，栖息地可利用性指数应考虑概率而不是二元斑块间的联系。我们讨论了结果的某些保护意义，并强调了生态可缩放图理论框架的优势。

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