Lauver Chris L, Busby Willian H, Whistler Jerry L
Kansas Biological Survey, University of Kansas, Lawrence, KS 66047, USA.
Environ Manage. 2002 Jul;30(1):88-97. doi: 10.1007/s00267-001-2609-z.
Demand for information that can be used to manage loggerhead shrikes has recently increased because of concern over declining populations and loss of open, non-forested habitat. A previously-developed habitat model was modified to predict shrike habitat quality on Fort Riley Military Reservation (FRMR) in Kansas. Shrike habitat suitability indices were calculated based on the amount of potential and usable foraging habitat, and the number of potential nesting sites within a specified area. Interpretation of high quality digital photographs was used to delineate land cover classes, hedgerows and tree counts. These data were entered into a geographic information system (GIS) as individual data sets. The shrike habitat model was then employed to produce a GIS database predicting low, moderate, and high quality shrike habitat throughout the Reservation. Model results indicated that 67% of the Reservation was suitable habitat for loggerhead shrikes. Although over 80% of FRMR was mapped as grassland, the presence of few to several isolated trees or hedgerows was identified as a key factor in modeling habitat suitability. The accuracy of the GIS model was 82% in predicting suitable (moderate and high quality) loggerhead shrike habitat using an independent set of 66 recent shrike observations. The number of potential nesting sites and percent cover of usable foraging habitat were significantly related to habitat suitability of the sites occupied by shrikes.
由于对数量下降以及开放的非森林栖息地丧失的担忧，近期对可用于管理赤胸朱顶雀的信息的需求有所增加。对先前开发的栖息地模型进行了修改，以预测堪萨斯州莱利堡军事保留地（FRMR）的朱顶雀栖息地质量。朱顶雀栖息地适宜性指数是根据潜在和可用觅食栖息地的数量以及指定区域内潜在筑巢地点的数量计算得出的。利用高质量数码照片的解读来划定土地覆盖类别、树篱和树木数量。这些数据作为单独的数据集输入到地理信息系统（GIS）中。然后使用朱顶雀栖息地模型生成一个GIS数据库，预测整个保留地低、中、高质量的朱顶雀栖息地。模型结果表明，67%的保留地是赤胸朱顶雀的适宜栖息地。尽管超过80%的FRMR被绘制成草地，但发现少量到几棵孤立树木或树篱的存在是模拟栖息地适宜性的关键因素。使用一组独立的66个近期朱顶雀观测数据，GIS模型预测适宜（中、高质量）赤胸朱顶雀栖息地的准确率为82%。潜在筑巢地点的数量和可用觅食栖息地的覆盖百分比与朱顶雀占据的地点的栖息地适宜性显著相关。
