A removal experiment with sympatric populations of Apodemus sylvaticus (L.) and A. flavicollis (Melchior) (Rodentia: Muridae)
A removal experiment with sympatric populations of Apodemus sylvaticus (L.) and A. flavicollis (Melchior) (Rodentia: Muridae)
复制标题
黑线姬鼠 (L.) 和黄线姬鼠 (Melchior) 同域种群的去除实验（啮齿目：鼠科）
作者：
W. Montgomery
本研究探讨了竞争在同域分布的森林姬鼠和高山姬鼠种群关系中的作用。flavicollis在伍德切斯特公园，格洛斯特郡，英格兰。三个网格被困12个月，以监测种群规模，生存，繁殖，体重，空间隔离和微生境协会的变化。助理flavicollis从一个网格中移除，A.而第三个上的啮齿动物群落保持完整作为对照。在接下来的7个月内观察到生态参数的后续变化。这两个物种的隔离种群进入生殖条件早于控制网格。这导致了A. flavicollis种群的动态，而A.林栖动物没有受到影响。在没有同类的情况下，这两个物种都更多地利用了曾经是缺席物种经常光顾的林地。然而，在两个物种群落中观察到的特定微生境协会仍然实验操作后。结果表明，虽然A. sylvaticus和A.虽然flavicollis确实竞争空间，但这是一种相对较弱的相互作用，不会导致栖息地排斥。竞争可能是改善这些姬鼠物种的生物学的内在差异。
SummaryThis study examines the role of competition in the relationship between sympatric populations of Apodemus sylvaticus and A. flavicollis at Woodchester Park, Gloucestershire, England. Three grids were trapped for twelve months to monitor changes in population size, survival, reproduction, body weight, spatial segregation and microhabitat associations. The A. flavicollis was removed from one grid, A. sylvaticus from another while the rodent community on the third was left intact as a control. Subsequent changes in ecological parameters were observed over a further period of 7 months. Isolated populations of both species entered reproductive condition earlier than on the control grid. This resulted in a rapid increase of the A. flavicollis population but the dynamics of A. sylvaticus were unaffected. In the absence of their congener both species made greater use of areas of woodland once frequented by the absent species. However specific microhabitat associations observed in two species communities remained after experimental manipulation. It is concluded that although A. sylvaticus and A. flavicollis do compete for space, this is a comparatively weak interaction which does not lead to habitat exclusion. Competition is probably ameliorated by intrinsic differences in the biology of these Apodemus species.