Leslie Hayes Jane
Department of Entomology, University of Kansas, 66045, Lawrence, Kansas, USA.
The Rocky Mountain Biological Laboratory, 81224, Crested Butte, Colorado, USA.
Oecologia. 1981 May;49(2):188-200. doi: 10.1007/BF00349187.
Key factor analysis techniques were used to examine factors determining the abundance of a population of non-pest Colias. The number of individuals entering each successive life stage in the sample population are summarized in life tables for 1975 to 1979. Survivorship to the adult is a relatively consistent proportionality (-x=1.2%, S.D.=1.14; 1975-1979). Factors resulting in reduced natality and, less importantly, mortality during larval diapause determine the population trends for C. alexandra. Egg mortality, pre-diapause larval mortality and postdiapause mortality contribute little to these trends. Possible key sources contributing to reduced natality are examined. Mortality of adults (including removal by collectors), poor weather conditions during the oviposition period, unseasonal snow or drought which affect nectar sources or oviposition sites are among the factors which cause reduced natality and result in population depression.
运用关键因素分析技术来研究决定非害虫云粉蝶种群数量的因素。1975年至1979年的生命表总结了样本种群中进入每个连续生命阶段的个体数量。存活到成虫阶段的比例相对稳定（-x = 1.2%，标准差 = 1.14；1975 - 1979年）。导致出生率降低以及在幼虫滞育期间死亡率降低（相对不太重要）的因素决定了亚历山大云粉蝶的种群趋势。卵死亡率、滞育前幼虫死亡率和滞育后死亡率对这些趋势的影响很小。研究了导致出生率降低的可能关键因素。成虫死亡率（包括被采集者捕获）、产卵期恶劣的天气条件、影响花蜜来源或产卵地点的非季节性降雪或干旱等因素都会导致出生率降低并导致种群数量下降。
