EFFECTS OF RESOURCE PARTITIONING ON THE POPULATION DYNAMICS AND ENERGY UTILIZATION STRATEGIES OF FERAL HOUSE MICE (MUS MUSCULUS) POPULATIONS UNDER EXPERIMENTAL FIELD CONDITIONS
EFFECTS OF RESOURCE PARTITIONING ON THE POPULATION DYNAMICS AND ENERGY UTILIZATION STRATEGIES OF FERAL HOUSE MICE (MUS MUSCULUS) POPULATIONS UNDER EXPERIMENTAL FIELD CONDITIONS
复制标题
资源分配对野外实验条件下野家鼠种群动态及能量利用策略的影响
DOI：
10.2307/1936584
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发表时间：
1978
期刊：
影响因子：
4.8
通讯作者：
G. Barrett
中科院分区：
文献类型：
--
作者：
Karen L. Stueck;G. Barrett
八点零。1975年6月6日，1公顷的小型哺乳动物围栏里饲养了家鼠(Mus Musculus)。直到1975年12月下旬，老鼠才被允许进入所有电网。其中四个网格包含一个集中的粮食(玉米)仓库，而另外四个网格包含等间距的分散仓库。到1975年11月1日，所有人口的密度都达到峰值。集中式网格种群的平均峰值密度为-20只/网格，而分散式网格种群的平均峰值密度为-30只/网格。随着种群密度的增加，两种网格类型的种群参数都降低了：繁殖率、幼虫死亡率、种群增长率和诱捕第一个月的平均队列重量。分散网格中的d d和Y Y分别比集中网格中的d d和Y Y具有更大的存活率。在所有电网中，玉米消费量在10月中旬之后最大。在整个研究过程中，分散栅格中的动物比集中式栅格中的动物利用更多的玉米来满足它们的能量需求。在分散网格中，d、d和y、y的同化效率相似，无论它们被困在网格中的哪个位置。然而，来自中央栅格外围地区的动物的同化效率明显低于来自食品库地点的动物。食物资源分配不均，加上人口密度高，对人口增长和结构的抑制作用比单纯的人口密度高更大。
Eight 0. 1-ha small-mammal enclosures were stocked with house mice (Mus musculus) on 6 June 1975. Mice were allowed to populate all grids until late December 1975. Four of the grids contained a centralized food (corn) depot while the other 4 contained equally spaced decentralized depots. Peak densities were reached in all populations by 1 November 1975. Populations in centralized grids reached a mean peak density of -20 animals per grid while the mean peak density in the decentralized grid populations was --30 animals per grid. Decreases in the following population pa- rameters were found in both grid types with increased population densities: reproduction, juvenile mortality, population growth rates, and average cohort weights at first month of trapping. The d d and Y Y in decentralized grids exhibited greater survivorship than did d d and Y Y in centralized grids, respectively. Corn consumption was greatest in all grids after mid-October. Animals in the decentralized grids utilized a greater percent of corn to fulfill their energetic requirements than did animals in the centralized grids throughout the study. In the decentralized grids d d and Y Y were found to have similar assimilation efficiencies no matter where they were trapped in the grids. How- ever, animals from peripheral areas in centralized grids exhibited significantly lower assimilation efficiencies than did animals from food-depot locations. Uneven partitioning of food resources, com- pounded by high population density, has a greater depressing effect on population growth and struc- ture than does high density alone.