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Impacts of Habitat Fragmentation by Agriculture on Breeding Songbirds in the Okanagan Sagebrush Shrubsteppe.

机译：农业生境破碎化对Okanagan鼠尾草灌木繁育鸣禽的影响。

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摘要

The sagebrush shrubsteppe of western North America has been extensively fragmented by agriculture. I examined the impact of habitat fragmentation on songbirds by comparing community assemblage and nest success in sagebrush habitat near agriculture to habitat away from orchards or vineyards in the Okanagan region. The songbird community in edge habitat differed from the community in interior habitat primarily due to an abundance of generalist species in edge habitat. Local vegetation characteristics, landscape composition and the predator community all contributed to observed variation in the songbird community. Abundance of sagebrush specialist songbirds in edge and interior habitat varied with species, but overall, sagebrush songbirds initiated fewer per capita nesting attempts in edge habitat. Daily nest survival of sagebrush songbirds was lower in orchard edge habitat than in vineyard edge habitat or interior habitat. These results provide additional evidence that sagebrush fragmentation is contributing to observed population declines of sagebrush songbirds.;Keywords: sagebrush; fragmentation; edge effects; agriculture; nest survival; songbird.
机译：北美西部的鼠尾草灌木林已被农业广泛分割。我通过比较农业附近的鼠尾草栖息地与奥肯那根地区果园或葡萄园以外的栖息地的群落组合和巢成功，研究了栖息地破碎化对鸣禽的影响。边缘栖息地的鸣禽群落与内部栖息地的群落不同，主要是由于边缘栖息地有大量的通才物种。当地的植被特征，景观组成和捕食者群落都促进了鸣禽群落中观察到的变化。鼠尾草专业鸣禽在边缘和内部生境中的丰富度随物种而异，但总体而言，鼠尾草鸣禽在边缘生境中发起的人均筑巢尝试较少。鼠尾草鸣鸟在果园边缘栖息地的每日巢生存率低于葡萄园边缘栖息地或内部栖息地。这些结果提供了另外的证据，表明鼠尾草碎片化是导致观察到的鼠尾草鸣禽种群下降的原因。碎片化边缘效应农业;巢生存；鸣禽。

著录项

  • 作者

    Knight, Elly.;

  • 作者单位

    Simon Fraser University (Canada).;

  • 授予单位 Simon Fraser University (Canada).;
  • 学科 Wildlife management.;Ecology.
  • 学位 M.Sc.
  • 年度 2013
  • 页码 96 p.
  • 总页数 96
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 能源与动力工程;
  • 关键词

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