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首页> 外文期刊>Polar biology >Quantifying fall migration of Ross's gulls (Rhodostethia rosea) past Point Barrow, Alaska
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Quantifying fall migration of Ross's gulls (Rhodostethia rosea) past Point Barrow, Alaska

机译：量化罗斯海鸥（Rhodostethia rosea）经过阿拉斯加州Point Barrow的秋季迁徙

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摘要

The Ross's gull (Rhodostethia rosea) is a poorly known seabird of the circumpolar Arctic. The only place in the world where Ross's gulls are known to congregate is in the near-shore waters around Point Barrow, Alaska, where they undertake an annual passage in late fall. Ross's gulls seen at Point Barrow are presumed to originate from nesting colonies in Siberia, but neither their origin nor their destination has been confirmed. Current estimates of the global population of Ross's gulls are based largely on expert opinion, and the only reliable population estimate is derived from extrapolations from previous counts conducted at Point Barrow, but these data are now over 25 years old. In order to update and clarify the status of this species in Alaska, our study quantified the timing, number, and flight direction of Ross's gulls passing Point Barrow in 2011. We recorded up to two-thirds of the estimated global population of Ross's gulls (≥27,000 individuals) over 39 days with numbers peaking on 16 October when we observed over 7,000 birds during a 3-h period.
机译：罗斯的海鸥（Rhodostethia rosea）是北极极地北极圈中鲜为人知的海鸟。世界上唯一已知的罗斯海鸥聚集的地方是阿拉斯加州波罗角（Point Barrow）附近的近岸水域，它们在深秋每年进行一次通行。据推测，在巴罗角（Point Barrow）看到的罗斯海鸥起源于西伯利亚的嵌套殖民地，但尚未确定其起源或目的地。目前对罗斯海鸥的全球种群的估计主要基于专家的意见，唯一可靠的种群估计数是根据对Point Barrow进行的先前计数推算得出的，但这些数据已有25年的历史了。为了更新和弄清该物种在阿拉斯加的状况，我们的研究量化了罗斯海鸥在2011年经过巴罗点（Point Barrow）的时间，数量和飞行方向。我们记录了罗斯海鸥估计全球种群总数的三分之二（ ≥27,000个个体）在39天之内，数量在10月16日达到峰值，当时我们在3小时内观察到7,000多只鸟类。

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