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首页> 外文期刊>The Open Ornithology Journal >Edge Effects on Avian Diversity and Density of Native Grass Conservation Buffers
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Edge Effects on Avian Diversity and Density of Native Grass Conservation Buffers

机译：对本地草类保护缓冲液的鸟类多样性和密度的边缘效应

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Conservation Reserve Program Conservation Practice 33 (CP33: Conservation Buffers for Upland Birds) provideshabitat for grassland birds in agriculture-dominated landscapes. However, landscape context and adjacency of otherland covers may influence colonization, occupancy, and reproductive performance of breeding grassland birds in buffers.Our objective was to determine how edge effects influence diversity and density of breeding grassland birds in CP33buffers. Data collected during transect surveys in CP33 buffers at a privately-owned farm in Clay County, Mississippi,USA during the 2007-2009 breeding seasons indicated that buffers with a woody edge had the least diversity and densityof grassland and facultative grassland birds. Dickcissels (Spiza americana), the most abundant grassland bird species detectedin buffers, had a lower density in woodland-bordered buffers than in grassland-bordered buffers. Red-wingedBlackbirds (Agelaius phoeniceus) had a lower density in buffers adjacent to woodlands than buffers adjacent to developedareas and those bordered on both sides by crop fields. Conversely, Indigo Buntings, (Passerina cyanea) a woodland edgespecies, had the greatest density in woodland-bordered buffers when compared to buffers adjacent to grassland and developedareas. These results demonstrate that adjacency influences colonization processes and conservation design shouldexplicitly incorporate local landscape context in field and farm-scale conservation plans. Where conservation of obligategrassland birds is a primary objective of native grass conservation buffers, avoidance of buffer establishment adjacent towoodlands may maximize environmental services as measured by grassland bird diversity and density.
机译：自然保护区计划自然保护区33（CP33：山地鸟类保护区）为以农业为主的景观中的草地鸟类提供了栖息地。然而，景观环境和其他土地覆盖物的邻接可能会影响缓冲区中繁殖的草地鸟类的定居，占有和繁殖性能。我们的目的是确定边缘效应如何影响CP33缓冲区中繁殖的草地鸟类的多样性和密度。在2007-2009繁殖季节期间，在美国密西西比州Clay县的一家私有农场的CP33缓冲区进行的断面调查中收集的数据表明，具有木质边缘的缓冲区的草原和兼性草原鸟类的多样性和密度最低。 Dickcissels（美洲Spiza）是在缓冲区中检测到的最丰富的草原鸟类物种，在林地缓冲区中的密度比草地缓冲区中的密度低。红翅黑鸟（Agelaius phoeniceus）在林地附近的缓冲区中的密度低于发达地区和两侧与农田相邻的缓冲区的密度。相反，靛蓝旗Bun（Passerina cyanea）是一种林地边缘物种，与毗邻草地和发达地区的缓冲区相比，在林地边界缓冲区中的密度最大。这些结果表明，邻接关系会影响殖民化过程，保护设计应在野外和农场规模的保护计划中明确纳入当地的景观环境。如果将原始鸟类保护区作为原生草保护缓冲带的主要目标，那么避免避开与林地相邻的缓冲带可能会通过草原鸟类的多样性和密度来最大化环境服务。

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