POLLINATOR MOVEMENTS AND THE POLYMORPHISM FOR OUTCROSSING RATE AT THE RAY FLORET LOCUS IN GROUNDSEL, SENECIO-VULGARIS L
POLLINATOR MOVEMENTS AND THE POLYMORPHISM FOR OUTCROSSING RATE AT THE RAY FLORET LOCUS IN GROUNDSEL, SENECIO-VULGARIS L
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DOI：
10.1038/hdy.1988.45
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发表时间：
1988-04-01
期刊：
影响因子：
3.8
通讯作者：
IRWIN, JA
中科院分区：
文献类型：
--
作者：
ABBOTT, RJ;IRWIN, JA
在人工林中记录了千里光辐射型和非辐射型对传粉者（蚜虫）的相对吸引力，其中，变异发生频率相等。传粉者表现出显着的歧视，有利于辐射状形态，72%的336次访问的植物轴承辐射头状花序。传粉者在植物间的飞行分析表明，辐射到辐射转换（R-R），其次是非辐射到辐射（N-R），然后辐射到非辐射（R-N）转换的偏好。非辐射植物（N-N）之间的飞行非常罕见。更大的频率的N-R相对于R-N转换导致的增加，在偏好的辐射形态的传粉者从第一个到第二个工厂在飞行序列。这种行为的原因是建议。鉴于某些假设，观察到的模式intermorph过渡航班将解释，在一定程度上，更大的女性异交的辐射型的基础上intermorph交叉，反过来，更高的女性异交率辐射相对于非辐射盘小花先前记录在一些多态性种群。
The relative attractiveness to pollinators (syrphid flies) of the radiate and non-radiate morphs of Senecio vulgaris was recorded in an artificial stand in which morphs occurred at equal frequency. Pollinators showed marked discrimination in favour of the radiate morph; 72 per cent of 336 visits were to plants bearing radiate capitula. Analysis of pollinator flights between plants showed a bias for radiate to radiate transitions (R-R), followed by non-radiate to radiate (N-R), then radiate to non-radiate (R-N) transitions. Flights between non-radiate plants (N-N) were very infrequent. The greater frequency of N-R relative to R-N transitions resulted from an increase in preference for the radiate morph as pollinators moved from the first to the second plant during a flight sequence. A cause of this behaviour is suggested. Given certain assumptions, the observed pattern of intermorph transition flights would explain, in part, the greater female outcrossing by the radiate morph based on intermorph crossing, and, in turn, the higher female outcrossing rate of radiate relative to non-radiate disc florets recorded previously in some polymorphic populations.