越冬地点的保真度和集体冬眠使北地龟易发生大规模死亡事件

IF 1 4区 生物学 Q3 ZOOLOGY Canadian Journal of Zoology Pub Date : 2023-10-30 DOI:10.1139/cjz-2023-0127
Grégory Bulté, Jessica A. Robichaud, Erika J. Shadlock, Steven J. Cooke, Gabriel Blouin-Demers
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引用次数: 0

摘要

大规模死亡事件的强度和频率似乎都在增加,因此了解其原因和后果对野生动物保护至关重要。我们报告了北地图龟种群的大规模死亡事件(Graptemys geographis (LeSueur, 1817))。在一个公共越冬地点,发现了142具尸体(约占种群的10%),似乎被河獭(Lontra canadensis (Schreber, 1777))捕食。我们将尸体的大小和性别与幸存的海龟进行了比较。较小的海龟和雄性比较大的海龟和雌性更容易被捕食。利用2003年至2022年在同一越冬地点捕获的数据,我们评估了该种群在冬季大规模死亡事件中的脆弱性。在2003年至2022年间标记的1875只海龟中,近60%的海龟使用了至少发生过一次大规模死亡事件的越冬地点。平均而言,海龟在它们第一次被捕获和最后一次被捕获之间至少有38%的冬天在这里越冬。我们的研究表明,行为和生理是如何相互作用的,使一个物种更容易发生大规模死亡事件和生态陷阱。保护越冬地点和尽量减少影响冬季捕食的人类压力可能对保护某些海龟种群至关重要。
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Overwintering site fidelity and communal hibernation predispose Northern Map Turtles to mass mortality events
Mass mortality events appear to be increasing in intensity and frequency, so understanding their causes and consequences is imperative for wildlife conservation. We report on a mass mortality event in a population of Northern Map Turtles ( Graptemys geographica (LeSueur, 1817)). At a communal overwintering site, 142 carcasses (ca. 10% of population) were recovered, seemingly depredated by river otters ( Lontra canadensis (Schreber, 1777)). We compared the size and sex of the carcasses to those of turtles that survived. Smaller turtles and males were more likely to be depredated than larger turtles and females. Using captures made at the same overwintering site between 2003 and 2022, we assessed the vulnerability of this population to mass mortality events during winter. Nearly 60% of the 1875 turtles marked between 2003 and 2022 used the overwintering site where the mass mortality event occurred at least once. On average, turtles overwintered at the site at least 38% of the winters between their first and last capture. Our study shows how behaviour and physiology interact to predispose a species to mass mortality events and ecological traps. Protecting overwintering sites and minimizing human pressures affecting winter depredation may be essential for the preservation of certain turtle populations.
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来源期刊
Canadian Journal of Zoology
Canadian Journal of Zoology 生物-动物学
CiteScore
2.40
自引率
0.00%
发文量
82
审稿时长
3 months
期刊介绍: Published since 1929, the Canadian Journal of Zoology is a monthly journal that reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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