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首页> 外文期刊>Chelonian conservation and biology >Variation in Reproductive Output of the Red-crowned Roofed Turtle (Batagur kachuga) and the Three-striped Roofed Turtle (Batagur dhongoka) in the Chambal River of North India
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Variation in Reproductive Output of the Red-crowned Roofed Turtle (Batagur kachuga) and the Three-striped Roofed Turtle (Batagur dhongoka) in the Chambal River of North India

机译：印度北部昌巴河的丹顶Roof（Batagur kachuga）和三条纹Roof（Batagur dhongoka）的繁殖产量变化

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摘要

Characterizing variation in reproductive output is foundational to understanding the demography of a population and determining management strategies. Doing so is paramount when the species of interest is threatened with extinction. The red-crowned roofed turtle (Batagur kachuga) and the three-striped roofed turtle (Batagur dhongoka) are severely threatened by overharvesting and habitat loss. Despite their imperiled status, there are very few published studies on species ecology and life history to enable effective conservation; the 3 published studies that are available were completed nearly 3 decades ago. We herein provide information on variation in reproductive output for these turtles in the Chambal River of North India. Generalized linear models and analyses of variance were fitted to data on nesting density, fecundity, and egg volume. The number of nests showed an overall decline across 3 seasons (2007, 2008, and 2010) over a 4-yr duration with the highest number of nests observed in the middle of each nesting season. Peak nesting activity potentially occurs at lowest river depth or maximum availability of nesting habitat. The observed decline in the number of nests could be related to a decline in the nesting cohort or a geographic shift in suitable nesting habitat or changes in food resource availability and/or acquisition, leading to fewer females nesting. The number of nests in B. kachuga were significantly negatively correlated with total precipitation in the immediately preceding year. Presumably, total precipitation may affect the amount of nesting habitat available or availability of some other limiting resource. Reproductive output in both species varied as a function of fecundity rather than egg volume, implying that maturity occurs at larger body sizes for egg volume to be unconstrained, which would require relatively long generation times. Variation in clutch size could be tied to variable resource acquisition patterns, although total precipitation was not found to be an appropriate proxy. Potential variation in fecundity as a function of body size was not accounted for in the study. The study corroborated previous findings that B. kachuga lays larger and fewer eggs than B. dhongoka. These results contribute to understanding the life history of these poorly documented turtle species and toward informing conservation actions. Future studies over a larger spatial extent need to characterize nesting sites and nest-site fidelity and incorporate data from individual females.
机译：表征生殖产出的变化是了解人口统计和确定管理策略的基础。当感兴趣的物种面临灭绝的威胁时，这样做至关重要。红顶red龟（Batagur kachuga）和三条纹roof龟（Batagur dhongoka）受到过度捕捞和栖息地丧失的严重威胁。尽管地位受到威胁，但很少有已发表的关于物种生态学和生命史的研究能够实现有效的保护；现有的3篇已发表研究已于3年前完成。我们在此提供有关印度北部香巴拉河中这些海龟繁殖产量变化的信息。广义线性模型和方差分析适合嵌套密度，繁殖力和卵量的数据。巢的数量在4年的时间内连续3个季节（2007年，2008年和2010年）总体下降，其中每个巢季的中间观察到的巢数量最多。高峰筑巢活动可能发生在最低河流深度或最大巢穴栖息地可用性的情况下。观察到的巢数减少可能与嵌套队列的减少或合适的筑巢栖息地的地理变化或食物资源可利用性和/或获取的变化有关，从而导致更少的雌性筑巢。 B. kachuga中的巢穴数量与前一年的总降水量显着负相关。据推测，总降水量可能会影响可用的筑巢栖息地数量或某些其他限制资源的可用性。两种物种的生殖产量都取决于繁殖力而不是卵的数量，这意味着在更大的体型下成熟会导致卵的数量不受限制，这将需要相对较长的繁殖时间。尽管没有发现总降水量是合适的替代指标，但离合器大小的变化可能与可变的资源获取模式有关。该研究未考虑生育力与体型的关系。这项研究证实了先前的发现，即卡其加氏杆菌产卵的数量要比血统双歧杆菌更大，数量更少。这些结果有助于理解这些文献记载不充分的龟类的生活史，并有助于保护行动。未来在更大的空间范围内的研究需要表征筑巢地点和筑巢地点的保真度，并纳入来自雌性个体的数据。

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  • 来源
    《Chelonian conservation and biology》 |2017年第2期|203-214|共12页
  • 作者

    Sirsi Shashwat; Singh Shailendra; Tripathi Ashutosh; McCracken Shawn F.; Forstner Michael R. J.; Horne Brian D.;

  • 作者单位

    Turtle Survival Alliance India, D1-317,Sect F, Lucknow 226021, Uttar Pradesh, India|Texas State Univ, Dept Biol, 601 Univ Dr, San Marcos, TX 78666 USA;

    Turtle Survival Alliance India, D1-317,Sect F, Lucknow 226021, Uttar Pradesh, India;

    Turtle Survival Alliance India, D1-317,Sect F, Lucknow 226021, Uttar Pradesh, India|Gharial Conservat Alliance, Madras Crocodile Bank Trust, Ctr Herpetol, Post Bag 4,East Coast Rd, Mamallapuram 603104, India;

    Texas State Univ, Dept Biol, 601 Univ Dr, San Marcos, TX 78666 USA;

    Texas State Univ, Dept Biol, 601 Univ Dr, San Marcos, TX 78666 USA;

    San Diego Inst Conservat Res, 15600 San Pasqual Valley Rd, Escondido, CA 92027 USA|Wildlife Conservat Soc, 2300 Southern Blvd, Bronx, NY 10460 USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Reptilia; Testudines; Batagur; North India; Chambal River; reproductive output;

    机译：爬行动物;睾丸;巴塔古尔;北印度;尚巴尔河;生殖产出;

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