MIGRATION FOR SURVIVAL - FINE-SCALE POPULATION REDISTRIBUTION IN AN APHID, MYZUS-PERSICAE
MIGRATION FOR SURVIVAL - FINE-SCALE POPULATION REDISTRIBUTION IN AN APHID, MYZUS-PERSICAE
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DOI：
10.2307/5039
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发表时间：
1990-10-01
影响因子：
4.8
通讯作者：
TAYLOR, LR
中科院分区：
文献类型：
--
作者：
HARRINGTON, R;TAYLOR, LR
(1)研究了连续3个冬季大田分离白菜植株上桃马铃薯蚜（Myzus persicae）菌落的空间分布规律；在一个冬季对20个蚁群的空间结构进行了详细分析。(2)蚜虫以老叶为食，在基叶相继脱落之前，不断向上迁移。移民预期资源枯竭；不能迁移总是致命的。6到17次这样的迁徙是一个殖民地过冬所必需的；各个年龄段的人都迁徙了。繁殖在冬季下降，蜂群的大小逐渐缩小，直到春天繁殖超过死亡。(4)个体在植物上的空间分布是个体定向迁移、迁移失败的个体死亡和迁移成功的个体繁殖的结果。在这一时期的大部分时间里，繁殖都很低，其影响很快就消失了。没有检测到竞争。(5)在群落大小、年龄结构和植株分布的连续变化过程中，除对叶片老化的行为反应外，log（空间方差= a+b） blog（平均“种群”密度）中的参数b保持不变；随着叶龄和蚜虫年龄的不同而不同。(6)人口模型需要更精确地定义“人口”和“迁移”，才能通过实验评估其实际价值。
(1) The continuous spatial redistribution of apterous virginoparous peach-potato aphid (Myzus persicae) colonies on isolated cabbage plants growing in a field was investigated during three successive winters; during one winter the spatial structure of twenty colonies was analysed in detail. (2) The aphids lived and fed on older leaves and migrated repeatedly up the plant before basal leaves successively abscised. Emigration anticipated resource depletion; failure to migrate was always fatal. (3) Between six and seventeen such migrations were necessary for a colony to survive the winter; individuals of all ages migrated. Reproduction declined over winter and the colonies progressively diminished in size until spring when reproduction exceeded mortality. (4) The spatial distribution of individuals on the plant was the product of the directed movement of the individuals, the resulting mortality of those that failed to migrate and the reproduction of those that did migrate successfully. Reproduction was low for most of the period and its effect rapidly dissipated. No competition was detected. (5) During successive changes of colony size, age structure and disposition on the plant, the parameter b, in log (spatial variance = a+b blog (mean ''population'' density), remained constant except in response to the behavioural reaction to leaf ageing; a differed with age of leaves and of aphids. (6) It is suggested that population models require more precise definition of ''population'' and ''migration'' before their real value can be assessed by experiment.