Incorporating landscape attributes into models for migratory grassland bird conservation
Incorporating landscape attributes into models for migratory grassland bird conservation
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DOI：
10.1046/j.1523-1739.2002.01328.x
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发表时间：
2002-12-01
影响因子：
6.3
通讯作者：
Higgins, KF
中科院分区：
文献类型：
--
作者：
Bakker, KK;Naugle, DE;Higgins, KF
我们评估了当地和景观属性对整个南达科他州（美国）东部草原（n = 380）中7种雀形目鸟类的发生和密度的影响。S. A.）。景观组成和土地覆盖进行了量化，在三个空间尺度：400，800和1600米半径从样带中心。单独的栖息地模型产生的混合草和高草草原地区，以描绘鸟类的方式响应当地和景观结构的地理变化。莎草弗伦斯（Cistothorus platensis）和粘土色麻雀（Spizella pallida）在混合草和高草地区使用大和小补丁，如果他们嵌入在一个景观与高比例的草原栖息地。这些物种的占有率较高，在小斑块内景观高草地丰富度比大斑块内低草地景观。蚱蜢麻雀（Ammodramus savannarum）和迪克cissels（Spiza americana）在混合草地区和萨凡纳麻雀（Passerculus pallichensis）在tallgrass地区的面积敏感的物种，使用大型草地补丁，无论景观配置。萨凡纳麻雀的发生在这两个地区和莎草弗伦斯，蚱蜢麻雀，西部草地百灵（Sturnella疏忽）在混合草地区与树木的补丁边缘的增加呈负相关。解释密度估计的变化只与当地的补丁和植被变量。个别物种表现出规模依赖性的差异，他们认为栖息地，并在他们的区域景观结构的反应。这些发现提供的证据表明，一个地区的结果可能无法外推到其他地区，因为它们可能因物种分布、植被结构和景观组成而异。区域草原鸟类栖息地的评估必须在多个尺度上进行，因为有些物种只对草原内的当地条件作出反应，而其他物种则对景观尺度上的栖息地结构作出反应。
We evaluated the influence of local and landscape attributes on the occurrence and density of seven passerine species in grasslands (n = 380) throughout eastern South Dakota ( U. S. A.). Landscape composition and land cover were quantified at three spatial scales: 400-, 800-, and 1600- m radii from the transect center. Separate habitat models were generated for mixed-grass and tallgrass prairie regions to depict the way birds respond to geographic variation in local and landscape structure. Sedge Wrens ( Cistothorus platensis) and Clay-colored Sparrows ( Spizella pallida) in the mixed-grass and tallgrass regions used both large and small patches if they were embedded in a landscape with a high proportion of grassland habitat. Occupancy rates for these species were higher in small patches within landscapes with high grassland abundance than in large patches within low grassland landscapes. Grasshopper Sparrows ( Ammodramus savannarum) and Dick-cissels ( Spiza americana) in the mixed-grass region and Savannah Sparrows ( Passerculus sandwichensis) in the tallgrass region were area-sensitive species that used large grassland patches regardless of landscape configuration. The occurrence of Savannah Sparrows in both regions and Sedge Wrens, Grasshopper Sparrows, and Western Meadowlarks (Sturnella neglecta) in the mixed-grass region was negatively associated with an increase in patch edges with trees. Explained variation in density estimates was associated only with local patch and vegetation variables. Individual species demonstrated scale-dependent differences in the way they perceived habitat and in their response to regional landscape structure. These findings provide evidence that results from one region may not be extrapolated to others because they may vary with species distribution, vegetation structure, and landscape composition. Assessments of regional grassland bird habitat must be conducted at multiple scales because some species respond only to local conditions within grasslands, whereas others respond to habitat structure at landscape scales.