一种长途迁徙的岸鸟在非繁殖季节的迁徙生态学:空间利用和迁徙模式是否存在性别差异?

IF 1.9 2区 生物学 Q3 BEHAVIORAL SCIENCES
Enzo Basso, Jorge Ruiz, Jennifer A. Linscott, Nathan R. Senner, Mitch Weegman, Bart Ballard, Juan G. Navedo
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引用次数: 0

摘要

在许多群居物种中,性别差异会导致运动模式的显著变化,进而导致种群内不同性别的社会和空间隔离。具体来说,在一些长途迁徙的岸鸟物种中,反向性二态被认为是非繁殖季节空间隔离的驱动因素。因此,在这些静止期,与空间使用相关的性别特异性成本可能会对这些物种雌性和雄性随后的迁移模式产生不同的影响。利用卫星跟踪技术,我们分析了智利奇洛埃岛哈德逊鲣鸟(Limosa haemastica)种群在非繁殖季节的空间利用和运动模式。我们预测,体型较大的雌鸟会表现出更多的限制性活动和更高的本地忠诚度,而体型较小的雄鸟则竞争性较弱,更具探索性。大多数个体表现出限制性的空间利用(即家庭范围),而小部分个体则表现出探索性的运动,从而形成游牧运动模式。大多数游牧个体随后在阿根廷过度繁殖,而不是迁回繁殖地。与我们的主要预测相反,观察到的运动模式都没有性别偏见。最近的证据表明,在奇洛埃岛的同一觅食地点,雌性和雄性鲣鸟会捕食不同大小的猎物。因此,与我们的研究结果一致,并得到最近其他研究结果的支持,在同一觅食区内的资源分配可以通过抵消雌性对雄性的反向性二态性所带来的竞争优势来减少两性之间的干扰竞争。最后,我们认为这些觅食策略上的性别差异对于群居性迁徙岸鸟种群可能是有利的,因为这些种群在非繁殖季节和非繁殖季节之间表现出很强的连通性和很高的地点忠诚度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Movement ecology during non-breeding season in a long-distance migratory shorebird: are space use and movement patterns sex-biased?

Movement ecology during non-breeding season in a long-distance migratory shorebird: are space use and movement patterns sex-biased?

In many gregarious species, sex-specific differences can lead to significant variation in movement patterns and, consequently, to social and spatial segregation by sex within the population. Specifically, in several long-distance migratory shorebird species, reverse sexual dimorphism has been proposed as a driver of spatial segregation during the non-breeding season. Thus, sex-specific costs associated with space use during these stationary periods could differentially condition subsequent movement patterns between females and males in these species. Using satellite tracking technology, we analyzed the space use and movement patterns of a population of Hudsonian godwits (Limosa haemastica), a gregarious long-distance migratory shorebird, during the non-breeding season in Chiloé, Chile. We predicted that larger females would show more restricted movements and higher local site fidelity, while smaller males would be less competitive and more exploratory. Most individuals exhibited restricted space use (i.e., a home range), while a smaller fraction showed exploratory movements leading to a nomadic movement pattern. Most of these nomadic individuals subsequently oversummered in Argentina rather than migrating back to breeding areas. Contrary to our main prediction, none of the observed movement patterns were sex-biased. Recent evidence suggests that female and male godwits access prey of different sizes within the same foraging sites on Chiloé. Thus, in accordance with our results, and supported by recent additional findings, resource-partitioning within the same foraging patches could reduce interference competition between the sexes by offsetting the competitive advantage associated with the reversed sexual dimorphism of females over males. Finally, we propose these sex differences in foraging strategies could be advantageous for gregarious migratory shorebird populations that show strong connectivity and high site fidelity during and between non-breeding seasons.

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来源期刊
CiteScore
3.90
自引率
8.70%
发文量
146
审稿时长
3 months
期刊介绍: The journal publishes reviews, original contributions and commentaries dealing with quantitative empirical and theoretical studies in the analysis of animal behavior at the level of the individual, group, population, community, and species.
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