SummaryThe Black-capped Petrel or Diablotin Pterodroma hasitata has a fragmented and declining population estimated at c.1,000 breeding pairs. On land, the species nests underground in steep ravines with dense understorey vegetation. The only confirmed breeding sites are located in the mountain ranges of Hispaniola in the Caribbean, where habitat loss and degradation are continuing threats. Other nesting populations may still remain undiscovered but, to locate them, laborious in situ nest searches must be conducted over expansive geographical areas. To focus nest-search efforts more efficiently, we analysed the environmental characteristics of Black-capped Petrel nesting habitat and modeled suitable habitat on Hispaniola using openly available environmental datasets. We used a univariate generalized linear model to compare the habitat characteristics of active Black-capped Petrel nests sites with those of potentially available sites (i.e. random pseudo-absences). Elevation, distance to coast, and the influence of tree cover and density emerged as important environmental variables. We then applied multivariate generalized linear models to these environmental variables that showed a significant relationship with petrel nesting activity. We used the top performing model of habitat suitability model to create maps of predicted suitability for Hispaniola. In addition to areas of known petrel activity, the model identified possible nesting areas for Black-capped Petrels in habitats not previously considered suitable. Based on model results, we estimated the total area of predicted suitable nesting habitat for Black-capped Petrels on Hispaniola and found that forest loss due to hurricanes, forest fires, and encroachment from agriculture had severely decreased availability of predicted suitable habitat between 2000 and 2018.

中文翻译：

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栖息地建模在伊斯帕尼奥拉岛定位濒临灭绝的黑顶海燕 Pterodroma hasitata 的筑巢区域并确定栖息地丧失

摘要黑冠海燕或暗黑蛋白紫檀有一个分散和下降的种群估计在大约 1,000 对繁殖对。在陆地上，该物种在陡峭的沟壑地下筑巢，下层植被茂密。唯一确认的繁殖地位于加勒比地区的伊斯帕尼奥拉山脉，那里的栖息地丧失和退化是持续的威胁。其他筑巢种群可能仍未被发现，但要找到它们，很费力原位巢穴搜索必须在广阔的地理区域进行。为了更有效地集中巢穴搜索工作，我们分析了黑顶海燕筑巢栖息地的环境特征，并使用公开可用的环境数据集对伊斯帕尼奥拉岛的合适栖息地进行了建模。我们使用单变量广义线性模型来比较活跃的黑顶海燕巢址与潜在可用地点（即随机假缺席）的栖息地特征。海拔、到海岸的距离以及树木覆盖和密度的影响成为重要的环境变量。然后，我们将多元广义线性模型应用于这些与海燕筑巢活动有显着关系的环境变量。我们使用性能最佳的栖息地适宜性模型来创建伊斯帕尼奥拉的预测适宜性地图。除了已知海燕活动的区域外，该模型还确定了黑冠海燕可能在以前认为不适合的栖息地筑巢的区域。根据模型结果，我们估计了伊斯帕尼奥拉岛黑顶海燕预测的合适筑巢栖息地的总面积，发现由于飓风、森林火灾和农业侵占导致的森林损失严重降低了 2000 年至 2018 年期间预测的合适栖息地的可用性.