萼花臂尾轮虫有性生殖、种群增长和休眠卵产量间的关系

摘要/Abstract

摘要： 利用种群指数增长和Logistic增长模型,通过计算机模拟研究了萼花臂尾轮虫有性生殖发生的频率、后代中的混交雌体百分率对种群增长和休眠卵产量的影响.在所模拟的参数范围内,随有性生殖发生频率由100%减小到20%,获得最大休眠卵产量所需的混交雌体百分率由9%增大到69%;随密度制约作用的增大(环境容纳量K值由1000减小到100),该混交雌体百分率由18%增大到69%,休眠卵产量由1072.10降低至133.67.种群的内禀增长率与获得最大休眠卵产量所需的混交雌体百分率间呈曲线相关.当有性生殖发生得越频繁、种群增长所受的密度制约作用较小时,后代中10%～30%的个体为混交雌体时的种群中休眠卵产量较大.

关键词: 萼花臂尾轮虫, 有性生殖, 种群增长, 休眠卵产量, 耿贝尔分布, 寒害, 极值分析, 皮尔逊Ⅲ分布, 对数正态分布, Weibull分布

Abstract: Using exponential and logistic growth models,the effects of sexual reproduction frequency and the proportion of a female's daughters reproducing sexually on population growth rate and resting egg production of freshwater rotifer Brachionus calyciflorus were examined by computer simulation. Within the parameters of the simulation,the percentage of micitc females in the offspring required for maximum resting egg production increased from 9% to 69%,when the frequency of sexual reproduction decreased from 100% to 20%. The increase of density dependent limitation (the value of Kdecreased from 1000 to 100) made this percentage increase from 18% to 69%,and resting egg production decrease from 1072.10 to 133.67. The relationship between the population growth rate (r) and the optimum percentage of mictic females in the offspring required for maximum resting egg production was best described by curvilinear regression. When sexual reproduction became more frequent and density dependent decreased,The population with the percentage of mictic females in the offspring in10～30% had a bigger resting egg production.

Key words: Brachionus calyciflorus, Sexual reproduction, Population growth, Resting egg prodution, chilling, extreme value analysis, log-normal distribution, Gumbel distribution, Weibull distribution, Pearson-III distribution

中图分类号:

Q959.181

席贻龙, 曹明, 黄祥飞. 萼花臂尾轮虫有性生殖、种群增长和休眠卵产量间的关系[J]. 应用生态学报, 2002, (12): 1649-1654.

XI Yilong, CAO Ming, HUANG Xiangfei. Relationship between sexual reproduction, population growth and resting egg production of freshwater rotifer Brachionus calyciflorus[J]. Chinese Journal of Applied Ecology, 2002, (12): 1649-1654.

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