Population structure and dynamics of sympatric Apodemus species (Rodentia: Muridae)
Population structure and dynamics of sympatric Apodemus species (Rodentia: Muridae)
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同域姬鼠属（啮齿类：鼠科）的种群结构和动态
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
W. Montgomery
中科院分区：
文献类型：
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作者：
W. Montgomery
本文报道了英格兰西部同域森林姬鼠和黄斑姬鼠的种群生物学。种群数量的年变化与异域种群的年变化非常相似，仅在秋季和初冬出现数量高峰。在夏初，针叶树的数量稳定而低，夏末和秋季迅速增加，整个冬季保持高位，春季急剧下降。黄曲霉的数量在繁殖开始后增加，并在整个夏秋季节持续上升。初冬是主要的衰退期。与异域研究中引用的密度相当。两种的春季种群均由在前一年夏末和秋季首次出现的群体组成。春季出现的个体很少能在夏季存活下来。黄灰松茸的繁殖开始于森林松茸的繁殖开始前4至6周。成年雄性和雌性平均体重的季节变化也表明，由于第二性征的获得和生殖成熟度的变化，黄斑金针菇比森林金针菇发生得早。所提供的数据不包含种间竞争的证据，结论是种间差异，主要是繁殖和年度种群周期的不同步，有助于它们稳定共存。
This paper describes the population biology of sympatric populations of Apodemus sylvaticus and A. flavicollis in western England. Annual changes in population siie closely resembled those seen in allopatric populations such that simultaneous peaks in number occurred only in autumn and early winter. Numbers of A. sylvaticus were low and stable in early summer increasing rapidly in late summer and autumn and remaining high throughout winter before a sharp decline in spring. Numbers of A. flavicollis increased after the start of reproduction and continued to rise throughout summer and autumn. The period of major decline of this species was during early winter. Densities of A. sylvaticus and A. flavicollis were comparable with those cited in allopatric studies. Spring populations of both species consisted of cohorts first appearing in the late summer and autumn of the previous year. Few individuals present in spring survived the summer. Reproduction of A. flavicollis commenced four to six weeks before that of A. sylvaticus. Seasonal variation in mean weight of adult males and females also indicates that those changes, due to the acquisition of secondary sex characteristics and reproductive maturity, occur earlier in A. flavicollis than in A. sylvaticus. Data presented contain no evidence of interspecific competition and it is concluded that interspecific differences, chiefly asynchrony in reproduction and annual population cycles, contribute to their stable coexistence.