Dixon A F G, Wellings P W, Carter C, Nichols J F A
School of Biological Sciences, University of East Anglia, NR4 7TJ, Norwich, UK.
Forest Research Station, Forestry Commission, Alice Holt Lodge, Wrecclesham, GU10 4LH, Farnham, Surrey, UK.
Oecologia. 1993 Mar;95(1):89-92. doi: 10.1007/BF00649511.
The hypothesis that seasonal changes in sycamore aphid,Drepanosiphum platanoidis (Schr.), recruitment are determined by changes in food quality and aphid population density was tested. There was no clear association between the reproductive activity of the sycamore aphid and the seasonal changes in specific amino acids or groups of amino acids in extracts of sycamore,Acer pseudoplatanus L., leaves. Seasonal changes in reproductive activity tracked the changes in total amino acids of the leaf tissue of the host, but with a short time delay. High numbers of adult aphids appeared to depress reproductive activity. A regression analysis of the results revealed that total amino acids the previous week and current numbers of adult aphids significantly affected sycamore aphid reproductive activity. The results of this analysis support the above hypothesis, that the marked seasonal changes in the total quantity of amino acids in sycamore leaves and intraspecific competition for this resource, through its effect on adult weight, shape the seasonal cycle in the reproductive activity of the sycamore aphid.
对悬铃木蚜（Drepanosiphum platanoidis (Schr.)）繁殖受食物质量变化和蚜虫种群密度影响这一假说进行了检验。悬铃木蚜（Drepanosiphum platanoidis (Schr.)）的繁殖活动与悬铃木（Acer pseudoplatanus L.）叶片提取物中特定氨基酸或氨基酸组的季节性变化之间没有明显关联。繁殖活动的季节性变化跟踪了宿主叶片组织中总氨基酸的变化，但有短暂延迟。大量成年蚜虫似乎会抑制繁殖活动。对结果的回归分析表明，前一周的总氨基酸量和当前成年蚜虫数量显著影响悬铃木蚜的繁殖活动。该分析结果支持上述假说，即悬铃木叶片中氨基酸总量的显著季节性变化以及对该资源的种内竞争，通过影响成虫体重，塑造了悬铃木蚜繁殖活动的季节性周期。
