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首页> 外文期刊>Journal of ornithology >Mortality within the annual cycle: seasonal survival patterns in Afro-Siberian Red Knots Calidris canutus canutus
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Mortality within the annual cycle: seasonal survival patterns in Afro-Siberian Red Knots Calidris canutus canutus

机译：年周期内的死亡率：非洲-西伯利亚红结Calidris canutus canutus的季节性生存模式

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摘要

Estimates of seasonal mortality for long-distance migrant birds are extremely challenging to collect and consequently reports are scarce. Determining when and where mortality occurs within the annual cycle is important for an understanding of population dynamics and the evolutionary drivers of long-distance migration. We collected data on seasonal survival in a mark-recapture study of colour-marked Red Knots Calidris canutus canutus in their main wintering area at tropical Banc d'Arguin, Mauritania,West Africa. Our study population breeds 9,000 km to the northeast on Taymyr Peninsula, central northern Siberia. Our results show that annual apparent survival decreased from 0.87 ± 0.01 (SE) in 2002-2005 to 0.78 ± 0.02 in 2006-2009. During the 3-yeartime-window between 2006 and 2009, additional resightings just before migration and after return to the wintering grounds allowed us to partition the year into two periods: the nonbreeding period on the Banc d'Arguin, and the migration and breeding period away from it. We estimated that, on the Banc d'Arguin, the 2-month apparent survival rate was 0.94 ± 0.01, whereas 2-month survival approached unity during the rest of year. Hence, most mortality occurred on the tropical wintering grounds. We reviewthe possible physiological and ecological stressors involved and discuss the generality of these results.
机译：估计长途迁徙鸟类的季节性死亡率极富挑战性，因此报告很少。确定死亡率在年度周期内何时何地发生对于了解人口动态和长途迁徙的进化驱动因素很重要。我们在西非毛里塔尼亚热带班奇·阿金（Barc d'Arguin）主要越冬地区对有色标记的红色结Calidris canutus canutus进行了标记捕获研究，收集了季节性生存数据。我们的研究种群在西伯利亚中北部塔伊米尔半岛东北方9,000公里处繁殖。我们的结果表明，年度表观存活率从2002-2005年的0.87±0.01（SE）降低到2006-2009年的0.78±0.02。在2006年至2009年这3年的时间范围内，在迁徙之前和返回越冬场之后进行了其他检查，使我们可以将年份分为两个时期：在Banc d'Arguin的非繁殖时期，以及迁徙和繁殖时期远离它。我们估计，在Arguin银行，其2个月的表观生存率为0.94±0.01，而其余月份的2个月生存率接近统一。因此，大多数死亡发生在热带越冬地。我们审查了可能涉及的生理和生态压力，并讨论了这些结果的一般性。

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