Seasonal survival and reversible state effects in a long‐distance migratory shorebird,Journal of Animal Ecology

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Seasonal survival and reversible state effects in a long‐distance migratory shorebird
Journal of Animal Ecology ( IF 3.5 ) Pub Date : 2020-06-20 , DOI: 10.1111/1365-2656.13246
Rose J Swift ₁ , Amanda D Rodewald ₁ , James A Johnson ₂ , Brad A Andres ₃ , Nathan R Senner ₄

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Events during one stage of the annual cycle can reversibly affect an individual's condition and performance not only within that stage, but also in subsequent stages (i.e., reversible state effects). Despite strong conceptual links, however, few studies have been able to empirically link individual-level reversible state effects with larger-scale demographic processes. We studied both survival and potential reversible state effects in a long-distance migratory shorebird, the Hudsonian Godwit (Limosa haemastica). Specifically, we estimated period-specific survival probabilities across the annual cycle and examined the extent to which an individual's body condition, foraging success, and habitat quality during the nonbreeding season affected its subsequent survival and reproductive performance. Godwit survival rates were high throughout the annual cycle, but lowest during the breeding season, only slightly higher during southbound migration, and highest during the stationary nonbreeding season. Our results indicate that overwintering godwits foraging in high-quality habitats had comparably better nutritional status and pre-migratory body condition, which in turn improved their return rates and the likelihood that their nests and chicks survived during the subsequent breeding season. Reversible state effects thus appeared to link events between nonbreeding and breeding seasons via an individual's condition, in turn affecting their survival and subsequent reproductive performance. Our study thus provides one of the few empirical demonstrations of theoretical predictions that reversible state effects have the potential to influence population dynamics.

中文翻译：

长距离迁徙滨鸟的季节性生存和可逆状态效应

在年度周期的一个阶段发生的事件不仅可以在该阶段内，而且在随后的阶段（即，可逆状态效应）都可以可逆地影响个人的状况和表现。然而，尽管有很强的概念联系，但很少有研究能够根据经验将个体水平的可逆状态效应与更大规模的人口统计过程联系起来。我们研究了远距离迁徙水鸟哈德逊戈德威特 (Limosa haemastica) 的生存和潜在可逆状态影响。具体而言，我们估计了整个年度周期中特定时期的生存概率，并检查了非繁殖季节期间个体的身体状况、觅食成功率和栖息地质量对其后续生存和繁殖性能的影响程度。Godwit 的存活率在整个年度周期中都很高，但在繁殖季节最低，在向南迁徙期间略高，在静止非繁殖季节最高。我们的研究结果表明，在优质栖息地觅食的越冬神仙具有相对较好的营养状况和迁徙前的身体状况，这反过来又提高了它们的返回率以及它们的巢穴和雏鸟在随后的繁殖季节存活的可能性。因此，可逆状态效应似乎通过个体状况将非繁殖季节和繁殖季节之间的事件联系起来，进而影响它们的存活和随后的繁殖性能。

更新日期：2020-06-20

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