骨年代学在琉球黑角龙地壁虎年龄测定中的验证与应用(鳞目:真鳞科)

IF 1.2 3区 生物学 Q2 ZOOLOGY
Takaki, Kurita, Mamoru, Toda
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引用次数: 6

摘要

骨骼年代学是一种通常用于估计野生两栖动物和爬行动物年龄的方法。然而,在某些物种中,生长阻滞线(lag)的数量并不一定反映年龄。我们验证了该方法在濒临灭绝的真鳞壁虎(Goniurosaurus kuroiwae)上的适用性,并推断了其野生种群的寿命和年龄结构。我们根据先前发表的早期生长数据将幼虎分为三组:第一组是第一个冬天之前的幼虎,第二组是第一个冬天之后的幼虎,第三组是第二个冬天之后的幼虎。然后比较这些组的LAG数。第1组所有个体均具有一个LAG,视为一条孵化线。第2组和第3组的大多数个体分别拥有一个和两个额外的lag (LAG1和LAG2),证实了lag每年形成的概念。一些壁虎表现出比预期更少的lag。对LAG和骨髓腔直径变化的分析表明,在LAG较少的动物中,发生了孵化线和lag1的内皮吸收或融合。LAG2从未因内膜吸收而丢失,并可通过其直径识别。因此,成年壁虎的年龄可以通过计算从LAG2向外的lag来确定。将该方法应用于野生种群,发现该物种的寿命不低于83个月,但碎片化生境中几乎所有个体在50个月前死亡,表明这种生境中种群的可持续性较低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Validation and Application of Skeletochronology for Age Determination of the Ryukyu Ground Gecko,Goniurosaurus kuroiwae (Squamata: Eublepharidae)
Skeletochronology is a method commonly used for estimating the age of amphibians and reptiles in the wild.However,the number of lines of arrested growth(LAGs)does not necessarily reflect age in some species.We validated the applicability of this method to an endangered eublepharid gecko,Goniurosaurus kuroiwae,then inferred its longevity and age structures in wild populations.We classified young geckos into three groups using previously published data for early growth:Group 1 contained hatchlings before the first winter,Group 2 contained hatchlings after the first winter,and Group 3 included yearlings after the second winter.LAG numbers in these groups were then compared.All individuals in Group 1 possessed a single LAG,which was considered as a hatching line.Most individuals in Groups 2and 3 possessed one and two additional LAGs,respectively(LAG1 and LAG2),corroborating the notion that LAGs are formed annually.A few geckos exhibited fewer LAGs than expected.Analysis of variations in LAG and marrow cavity diameter demonstrated that in animals with fewer LAGs,endosteal resorption or fusion of hatching line and LAG1had occurred.LAG2 was never lost by endosteal resorption and was identifiable by its diameter.Thus,the age of adult geckos could be determined by counting LAGs outward from LAG2.Application of this method to wild populations revealed that the longevity of this species is not less than 83 months,but that almost all individuals in fragmented habitats die before 50 months,suggesting lower population sustainability in such habitats.
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来源期刊
CiteScore
2.80
自引率
7.10%
发文量
441
审稿时长
>12 weeks
期刊介绍: AHR aims to provide a forum for herpetologists and related scientists interested in conducting international academic exchanges and joint studies, and a platform for introducing their newly made scientific and technological data, and publishing their research results and achievements in the world, but focusing on the Asian-Pacific Region. The principal criteria of AHR for acceptance of articles for publication are the quality and significance of the research, breadth of interest of the work to the readership, and the clarity and effectiveness of communication. AHR welcomes submission of manuscripts from authors in all countries of the world, though with a focus on the herpetological studies in the Asian and Pacific Region, including major articles, shorter communications and review articles.
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