Variation in the intensity of pollination inDrosera tracyi: Selection is strongest when resources are intermediate
Variation in the intensity of pollination inDrosera tracyi: Selection is strongest when resources are intermediate
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茅膏菜授粉强度的变化：资源中等时选择最强
DOI：
10.1007/bf01237761
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发表时间：
1995
影响因子：
1.9
通讯作者：
P. Wilson
中科院分区：
文献类型：
--
作者：
P. Wilson
我认为，当资源水平处于中间水平时，选择的力量最大。这一想法部分地用人工性状变异来测试，即在毛毡苔（Drosera tracyi）中花瓣大小的变异。这种植物每天早晨开一朵花，柱头变得可用，花粉同时出现在整个种群中。蜜蜂会在一两次拜访中把所有能带走的花粉都带走，把所有能存放的花粉都存款。访问率跟踪开花密度，花粉去除和沉积。我衡量选择的差异，花粉去除和沉积之间的花朵修剪花瓣与花朵正常花瓣。在一片草地上，我发现了一个广泛的授粉水平和相应的选择水平，选择在中等水平的授粉是最强的。这可能意味着，当资源处于中等水平时，生物体会适应这些条件，尽管它们可能很少经历这些条件。
I propose that the strength of selection is greatest when resource levels are intermediate. This idea was partially tested using artificial character variation for petal size inDrosera tracyi.This plant opens one flower each morning, with stigmas becoming available and pollen being presented simultaneously throughout the population. Bees remove all the pollen that can be removed and deposit all the pollen that can be deposited in one or two visits. Visitation rates track blooming density, as do pollen removal and deposition. I measured selection as the difference in pollen removal and deposition between flowers with trimmed petals versus flowers with normal petals. In one meadow, I found a wide range of levels of pollination and corresponding levels of selection, and selection was strongest at intermediate levels of pollination. This might mean that organisms are adapted to conditions when resources are at intermediate levels even though they may experience those conditions relatively rarely.