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Disentangling the effects of host resources, local, and landscape variables on the occurrence pattern of the dusky large blue butterfly (Phengaris nausithous) in upland grasslands
Journal of Insect Conservation ( IF 1.9 ) Pub Date : 2019-12-12 , DOI: 10.1007/s10841-019-00204-3
Antonio J. Pérez-Sánchez , Anett Schibalski , Boris Schröder , Sebastian Klimek , Jens Dauber

Determining the effects of local and landscape drivers on endangered species and predicting potential suitable habitats for their persistence is crucial for effective conservation management. Here, we applied a multi-scale approach to disentangle the effects of host resources, local, and landscape variables on the occurrence pattern of Phengaris (= Maculinea) nausithous in semi-natural upland grasslands. Our approach comprised the assessment of host parameters (plant cover, density, height, flower heads density, ant nest density, ant colony size), local grassland management (pasture, meadow), site conditions (area, shape, terrain attributes), and landscape variables (landscape composition, connectivity). We used ensemble of small models based on bivariate generalized linear models for explaining and predicting the butterfly occurrence pattern. Bivariate models revealed that host ant nest density, plant cover and height, local grassland management type (pasture), slope and eastness, landscape forest cover and grassland connectivity had a positive effect on the occurrence of P. nausithous (average explained deviance 20.5%). Host ant density, host plant cover, and local grassland management were the most influential factors on the ensemble predictions. The presence of P. nausithous in upland grasslands is not only determined by host resources, but also by local and landscape factors. Such factors proved to be relevant for identifying and predicting suitable grassland sites for this endangered species. Consequently, we recommend that conservation actions should include a landscape perspective to promote connectivity by facilitating coherent grazing networks enabling dispersal between semi-natural upland grasslands and thus species persistence.

中文翻译:

解析寄主资源、当地和景观变量对高地草原暗色大蓝蝶 (Phengaris nausithous) 发生模式的影响

确定当地和景观驱动因素对濒危物种的影响并预测其持续存在的潜在合适栖息地对于有效的保护管理至关重要。在这里,我们应用了一种多尺度方法来解开宿主资源、当地和景观变量对半天然高地草原中 Phengaris (= Maculinea) nausithous 发生模式的影响。我们的方法包括评估寄主参数(植物覆盖、密度、高度、花头密度、蚁巢密度、蚁群大小)、当地草地管理(牧场、草甸)、场地条件(面积、形状、地形属性)和景观变量(景观构成、连通性)。我们使用基于双变量广义线性模型的小模型集合来解释和预测蝴蝶发生模式。双变量模型显示寄主蚁巢密度、植物覆盖和高度、当地草地管理类型(牧场)、坡度和东向、景观森林覆盖和草地连通性对 P. nausithous 的发生有积极影响(平均解释偏差 20.5%) . 寄主蚂蚁密度、寄主植物覆盖率和当地草地管理是对集合预测影响最大的因素。P. nausithous 在高地草原中的存在不仅取决于寄主资源,还取决于当地和景观因素。事实证明,这些因素与确定和预测适合这种濒危物种的草地地点有关。最后,
更新日期:2019-12-12
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