繁殖期根田鼠种群密度对其种群统计参数及个体皮质酮水平的作用
Effects of population density on demography and individual corticosterone level during breeding period in root voles (Microtus oeconomus)
查看参考文献38篇
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文摘
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为探讨引起种群密度制约的近因,本研究通过在野外建立的4个面积为50 m×30 m的封闭围栏,研究了繁殖期根田鼠种群密度对其种群统计参数及个体皮质酮水平的作用.在围栏设置高密度和低密度种群,测定了繁殖期根田鼠种群密度对种群补充率、存活率、变化率及个体皮质酮水平的作用.高密度种群的补充率和变化率较低密度种群显著降低,但其种群建群者存活率和子代存活率较低密度无显著变化.种群补充率和变化率分别与种群建群者数量呈显著回归关系.高密度处理建群者的血浆皮质酮含量和脾脏指数均显著高于低密度处理.上述结果说明,繁殖期根田鼠种群对其补充率和变化率存在密度制约作用,围栏种群建群者的数量是产生密度制约的唯一制约因子.密度制约与社群应激之间存在密切关联.社群应激可能是种群产生密度制约的近因之一. |
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其他语种文摘
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The proximate causation of density-dependence is not clear so far.Social stress may be related to density-dependence.To examine this hypothesis,we experimentally investigated the effects of population density on demography and individual corticosterone levels during the breeding period in root voles(Microtus oeconomus).We established replicate root vole populations at high and low densities in 4 field enclosures(50 m×30 m)at the Haibei Research Station of Alpine Meadow Ecosystem,the Chinese Academy of Sciences,and tested the effects of population density on recruitment rate,survival rate,and rate of population change,as well as on individuals corticosterone level.The results showed that high density caused a lower rate of recruitment and a rate of population change.Significant linear regression relationship between the rate of population change,the rate of recruitment and founder number respectively were found.However,survival rate of founders or offspring were not different between high and low densities.In addition,under high density conditions root voles exhibited an increase in corticosterone level and spleen index.We conclude that the rate of recruitment and rates of change in population is density-dependent,which is only induced by founder numbers.The density dependence is related to social stress responses of individuals.The social stress may be a proximate causation to induce density dependence in population of root voles. |
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来源
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兽类学报
,2008,28(2):135-143 【核心库】
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关键词
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种群密度
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密度制约
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皮质酮
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根田鼠
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地址
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1.
中国科学院西北高原生物研究所, 青海, 西宁, 810001
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杭州师范大学生命科学学院, 浙江, 杭州, 310036
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-1050 |
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学科
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动物学 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:3246451
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