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Lan ZHAO Hai-Qiong YANG Li-Ming FANG Guo-Liang PAN Wei-Qiang ZOU Da-Bin REN Qiu-Hong WAN Sheng-Guo FANG 《动物学报(英文版)》2013,(6):725-731
The Chinese alligator Alligator sinensis is one of the most endangered crocodilian species, and typically exhibits temperature-dependent sex determination. It is extremely important to clarify the sex structure of Chinese alligators to implement recovery projects successfully. However, the sex ratio of wild Chinese alligators remains unknown. In this study, we collected 28 years of sex ratio data from Chinese alligators residing in the natural and artificial habitats of Changxing Nature Reserve, China, and examined the differences in the sex ratio dynamics between these two populations. We observed that the sex ratio of wild Chinese alligators is 1 male to 4.507 females, which was significantly lower compared to that of the captive population (1 to 2.040; P 〈 0.001), and is significantly different to previously documented sex ratios for this species (all P 〈 0.01). Furthermore, we documented an annually stable (P = 1.000) female-biased sex ratio for wild alligators at hatching [1 male to 4.747 females; 0.174 (0.167~).182)], in contrast to a dramatically fluctuating sex ratio (P 〈 0.001) in captivity [1 male to 1.674 females; 0.374 (0.246-0.593)], showing a potential mechanism for adjusting the sex structure. Finally, we found that the hatchling sex ratios were similar to that of the population sex ratio (P = 0.748), with little correlation to air temperature values in the 60-70 day incubation period during the breeding season (July and August; both P 〉 0.05). Overall, this study indicates that the stabilized female-biased sex ratio of Changxing Chinese alligators might result from selection pressure caused by local mate competition and major inbreeding . 相似文献
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两性具有不同出生率和死亡率的种群动态 总被引:12,自引:0,他引:12
以往的种群动力学模型均隐含假设性比为1:1,而实际上并非总如此,不同性别的出生和死亡是不完全相同的。文中就考虑了两性具有不同出生率和死亡率的种群动态问题。可以知道种群动态只是受雌性控制,与雄性无关。 相似文献
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利用不育技术防治高原鼠兔的理论模型 总被引:6,自引:0,他引:6
高原鼠兔数量的激增加剧了高寒草甸的退化,采取化学灭杀的方法控制高原鼠兔,只能暂时降低高原鼠兔的数量,在较短的时间内种群又会恢复到原来的水平。本文从理论上探讨不育控制对高原鼠兔种群的影响,建立了具有性别结构的高原鼠兔种群的数学模型,探讨在不育控制中两性的不育率对种群动态的影响并比较不育控制与化学灭杀的区别。结果表明:不育控制比化学灭杀在抑制和消灭种群上都具有更好的效果;在不育控制中雌性的不育率具有更为重要的作用,所以在利用不育技术控制高原鼠兔时要特别注意雌性不育率。 相似文献
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讨论一类具有性别结构的捕食者-食饵扩散模型在齐次Neumann边界条件下解的存在唯一性和一致有界性,并由线性化方法和Lyapunov函数方法分别证明了该模型正平衡点的局部和全局渐近稳定. 相似文献
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利用不育技术防治高原鼠兔的理论模行 总被引:1,自引:0,他引:1
高原鼠兔数量的激增加剧了高寒草甸的退化,采取化学灭杀的方法控制高原鼠兔,只能暂时降低高原鼠兔的数量,在较短的时间内种群又会恢复到原来的水平.本文从理论上探讨不育控制对高原鼠兔种群的影响,建立了具有性别结构的高原鼠兔种群的数学模型,探讨在不育控制中两性的不育率对种群动态的影响并比较不育控制与化学灭杀的区别.结果表明:不育控制比化学灭杀在抑制和消灭种群上都具有更好的效果;在不育控制中雌性的不育率具有更为重要的作用,所以在利用不育技术控制高原鼠兔时要特别注意雌性不育率. 相似文献
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