THE POLLINATION ECOLOGY OF AQUILEGIA-MICRANTHA (RANUNCULACEAE) IN COLORADO
THE POLLINATION ECOLOGY OF AQUILEGIA-MICRANTHA (RANUNCULACEAE) IN COLORADO
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DOI：
10.2307/3671384
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发表时间：
1983-01-01
影响因子：
0.2
通讯作者：
WILLARD, CL
中科院分区：
文献类型：
--
作者：
MILLER, RB;WILLARD, CL
一种薇甘菊生长在美国西南部的峡谷中。粉黄色的花点头或半点头，中间有香味，质地，并分泌集中的花蜜(总糖的46%)。授粉器封闭条件下的结实率为25%，而自由授粉的结实率为63%。在水晶河峡谷上游，最常见和最有效的薇甘菊传粉者是以花蜜为食的大黄蜂、熊蜂和黄蜂王，尽管蜂鸟和天蛾也会访花，而蜂鸟在其他地点也是重要的传粉者。在该地区的红花中，没有觅食花蜜的熊蜂女王，这可能是因为红花的花冠较窄，这阻止了蜜蜂将头伸进花朵中足够深的地方来提取花蜜。这种机械隔离可能是限制这两个种之间杂交的重要因素。在狭小的海拔范围内。
A micrantha occurs in canyons of the Southwestern USA. The pinkish-yellow flowers are nodding or semi-nodding, midly scented, protandrous, and secrete a concentrated nectar (46% total sugars). Seed set in flowers under pollinator exclosures was 25% compared with 63% for open-pollinated flowers. The most common and effective pollinators of A. micrantha in the upper Crystal River canyon were nectar-foraging bumblebee queens, Bombus appositus and B. flavifrons, although hummingbirds and hawkmoths also visited the flowers, and hummingbirds are important pollinators at other sites. The absence of nectar-foraging Bombus queens on the red flowers of A. elegantula in the area is probably the result of the narrower spur mouths of A. elegantula that prevent the bees from inserting their heads deeply enough into the flowers to extract the nectar. This mechanical isolation may be important in restricting hybridization between the 2 spp. in the narrow elevational range of sympatry.