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Behavioral strategies during incubation influence nest and female survival of Wild Turkeys

机译:孵化过程中的行为策略影响野生火鸡的巢和女性生存

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摘要

Females must balance physiological and behavioral demands of producing offspring with associated expenditures, such as resource acquisition and predator avoidance. Nest success is an important parameter underlying avian population dynamics. Galliforms are particularly susceptible to low nest success due to exposure of ground nests to multiple predator guilds, lengthy incubation periods, and substantive reliance on crypsis for survival. Hence, it is plausible that nesting individuals prioritize productivity and survival differently, resulting in a gradient of reproductive strategies. Fine‐scale movement patterns during incubation are not well documented in ground‐nesting birds, and the influence of reproductive movements on survival is largely unknown. Using GPS data collected from female wild turkeys (n = 278) across the southeastern United States, we evaluated the influence of incubation recess behaviors on trade‐offs between nest and female survival. We quantified daily recess behaviors including recess duration, recess frequency, total distance traveled, and incubation range size for each nest attempt as well as covariates for nest concealment, nest attempt, and nest age. Of 374 nests, 91 (24%) hatched and 39 (14%) females were depredated during incubation. Average nest survival during the incubation period was 0.19, whereas average female survival was 0.78. On average, females took 1.6 daily unique recesses (SD = 1.2), spent 2.1 hr off the nest each day (SD = 1.8), and traveled 357.6 m during recesses (SD = 396.6). Average nest concealment was 92.5 cm (SD = 47). We found that females who took longer recess bouts had higher individual survival, but had increased nest loss. Females who recessed more frequently had lower individual survival. Our findings suggest behavioral decisions made during incubation represent life‐history trade‐offs between predation risk and reproductive success on an unpredictable landscape.
机译:女性必须平衡与相关支出产生后代的生理和行为要求,例如资源收购和避税等。巢成功是禽类人口动态的重要参数。由于地面巢暴露于多个捕食者关节,漫长的潜伏期,以及对克曲面的实质性依赖于存活,因此巨型植物尤其容易受到低巢成功的影响。因此,嵌套个体优先考虑不同的生产率和生存率不同,导致生殖策略的梯度。在孵育期间的细尺运动模式在地面嵌套鸟类中没有充分记录,并且生殖运动对生存的影响主要是未知的。使用从美国东南部的雌性野生火鸡(N = 278)收集的GPS数据,我们评估了孵化凹陷行为对巢和女性生存之间的权衡的影响。我们量化了每日凹陷行为,包括次次凹陷频率,凹陷频率,总距离,以及每个巢穴尝试的孵育范围大小以及用于巢穴隐藏,巢穴尝试和巢年龄的协变量。在孵化期间,374个巢穴,91(24%)孵化和39名(14%)的女性被剥夺。孵化期间的平均巢生存率为0.19,而平均女性存活率为0.78。平均而言,每天花费1.6个每日独特的凹槽(SD = 1.2),每天从巢穴中取下2.1小时(SD = 1.8),并在凹槽期间行驶357.6米(SD = 396.6)。平均巢穴隐藏为92.5厘米(SD = 47)。我们发现,养老院休息的女性具有更高的个体生存,但增加了巢损失。凹陷更频繁的女性患者较低的个体存活率。我们的研究结果提出了在孵化期间所作的行为决定代表了捕食风险与不可预测的景观的掠夺风险和生殖成功之间的终身权衡权衡。

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