缺少幼崽意味着威胁吗?了解一群长寿脊椎动物的体型分布。

IF 3.7 1区 环境科学与生态学 Q1 ECOLOGY
Donald T. McKnight, Deborah S. Bower, Ellen Ariel, Stephen Beatty, Simon Clulow, Marilyn Connell, Annette R. Deppe, Sean Doody, Alastair Freeman, Arthur Georges, Samantha L. Hannabass, Ethan C. Hollender, Hunter Howell, Aaron Krochmal, Day B. Ligon, Eric Munscher, Eric J. Nordberg, Timothy C. Roth, Anthony Santoro, Jason Schaffer, Angela Simms, Ricky-John Spencer, Paul Stone, Kameron C. Voves, Andrew D. Walde, Skye Wassens, Michael A. Welsh, Nick S. Whiterod, Wytamma Wirth, James U. Van Dyke
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引用次数: 0

摘要

在全球范围内,海龟数量正在减少,在调查期间缺少幼龟通常被解释为早期生命阶段受到威胁的证据。例如,在澳大利亚,人们普遍认为,幼狐数量低可能是由于引入的红狐(Vulpes Vulpes)捕食巢穴。然而,种群内的小样本量、幼龟的低可检测性以及海龟的长寿命往往会混淆幼龟数量不足表明种群数量下降的结论。由于海龟的繁殖寿命很长,我们可能会直观地认为大多数海龟种群都倾向于大型个体,但海龟种群的“典型”或“健康”大小分布尚未得到很好的确立。因此,我们整理了41,021只淡水龟的数据,这些淡水龟来自澳大利亚部分地区的38个物种和428个种群,有和没有引入狐狸,以及美国的种群,自然有浣熊(Procyon lotor),狐狸和其他巢穴捕食者。我们检查了种群水平的体型分布,以建立“典型”海龟种群的基线,并测试与缺乏引入狐狸的非澳大利亚种群和自然暴露于巢穴捕食者的美国种群相比,暴露于引入狐狸的种群的幼崽是否按比例减少。我们发现,不管狐狸或其他巢穴捕食者的存在,大多数非洲和美国的海龟种群都严重偏向于成年,很少有幼崽。然而,种群调查方法之间存在明显差异:针对浅水区域的方法(如小龙虾陷阱)往往捕获更多的幼鱼,而小样本量(~
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Does a lack of juveniles indicate a threat? Understanding body size distributions in a group of long-lived vertebrates

Does a lack of juveniles indicate a threat? Understanding body size distributions in a group of long-lived vertebrates

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来源期刊
Journal of Animal Ecology
Journal of Animal Ecology 环境科学-动物学
CiteScore
9.10
自引率
4.20%
发文量
188
审稿时长
3 months
期刊介绍: Journal of Animal Ecology publishes the best original research on all aspects of animal ecology, ranging from the molecular to the ecosystem level. These may be field, laboratory and theoretical studies utilising terrestrial, freshwater or marine systems.
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