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Site use and migration of scoters (Melanitta spp.) in relation to the spawning of Pacific herring (Clupea pallasi)

机译:与太平洋鲱鱼(Clupea pallasi)的产卵有关的立地的使用和迁移(Melanitta spp。)

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摘要

I investigated movements and site use by two scoter species during late winter and spring. In the Strait of Georgia, British Columbia, I found that radio-transmitter-tagged pre-migratory surf scoters (Melanitta perspicillata) and white-winged scoters (Melanitta fusca) left the areas where they had spent the winter and moved to Pacific herring (Clupea pallasi) spawn sites coincident with spawn availability in March. In southeast Alaska, I identified stopover and staging sites of satellite-transmitter-tagged migrating surf scoters and identified one site, Lynn Canal, as particularly important. I found that herring spawn availability and proximity to the mainland coast were strong predictors of site use, suggesting that the resource availability and geography of southeast Alaska provide important stopover habitat for migrants. Overall, there was strong phenological correspondence between the northward progression of scoter migration and herring spawn availability, suggesting that herring spawn is a valuable resource for scoters in late winter and spring.
机译:我调查了冬末和春季两个滑行物种的运动和场地使用情况。在不列颠哥伦比亚省的佐治亚州海峡,我发现带有无线电发射器标记的移民前冲浪苏格兰人(Melanitta perspicillata)和白翅苏格兰人(Melanitta fusca)离开了他们度过冬天的地区,并搬到了太平洋鲱鱼( (Clupea pallasi)产卵地点与3月份的产卵期相吻合。在阿拉斯加东南部,我确定了带有卫星发射器标签的正在迁移的冲浪苏格兰人的中途停留和中转站,并确定了一个特别重要的站点Lynn Canal。我发现鲱鱼的产卵量和与大陆海岸的距离是地点使用的有力预测指标,这表明阿拉斯加东南部的资源可用性和地理条件为移民提供了重要的中转栖息地。总体而言,在滑行迁徙的北移与鲱鱼产卵量之间存在强烈的物候学联系,这表明鲱鱼产卵是冬末和春季苏格兰人的宝贵资源。

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    Lok Erika K.;

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  • 年度 2008
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  • 原文格式 PDF
  • 正文语种 English
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