Brownlee Megan B, Bergeron Patrick, Réale Denis, Garant Dany
Département de Biologie, Université de Sherbrooke, Sherbrooke, Québec, Canada.
Department of Biology and Biochemistry, Bishop's University, Sherbrooke, Québec, Canada.
Oecologia. 2024 Dec 7;207(1):5. doi: 10.1007/s00442-024-05649-1.
Survival and reproductive success are greatly influenced by how an individual uses its surrounding environment, which can differ across spatial scales. To better understand the habitat-fitness relationships of animals, it is essential to study space use at multiple spatial scales. Here, we used 13 years of capture-mark-recapture and burrow location data to investigate how two different aspects of space use influence the survival and female reproduction in a wild population of eastern chipmunks (Tamias striatus) in southern Québec. We quantified home range size and site fidelity in a population experiencing massive inter-annual variations in food availability due to the masting of American beech trees (Fagus grandifolia). We found that site fidelity tended to increase the probability of reproduction but that this effect was strongly dependent on the context of beech seed production: probability of reproduction was higher for females that were faithful from a mast year to the following non-mast year. Site fidelity was not related to survival and we found no significant effect of home range size on either fitness trait. Our results indicate that, in our study system, different aspects of space use affect fitness traits in different ways. We emphasize the importance of examining multiple spatial scales in related analyses.
生存和繁殖成功受到个体如何利用其周围环境的极大影响，而周围环境在不同空间尺度上可能存在差异。为了更好地理解动物的栖息地与适应性之间的关系，在多个空间尺度上研究空间利用至关重要。在此，我们利用13年的标记重捕数据和洞穴位置数据，来研究空间利用的两个不同方面如何影响魁北克南部野生东部花栗鼠（Tamias striatus）种群的生存和雌性繁殖。我们在一个因美国山毛榉树（Fagus grandifolia）结实而导致食物供应出现巨大年际变化的种群中，对家域大小和地点忠诚度进行了量化。我们发现地点忠诚度往往会增加繁殖概率，但这种影响强烈依赖于山毛榉种子生产的背景：从结实年到次年非结实年保持忠诚的雌性繁殖概率更高。地点忠诚度与生存无关，并且我们发现家域大小对任何一个适应性特征都没有显著影响。我们的结果表明，在我们的研究系统中, 空间利用的不同方面以不同方式影响适应性特征。我们强调在相关分析中考察多个空间尺度的重要性。
