Effects of flower size and number on pollinator visitation to wild radish, Raphanus raphanistrum
Effects of flower size and number on pollinator visitation to wild radish, Raphanus raphanistrum
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DOI：
10.1007/bf00330014
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发表时间：
1996-03-01
期刊：
影响因子：
2.7
通讯作者：
Rush, S
中科院分区：
文献类型：
--
作者：
Conner, JK;Rush, S
增加传粉者访问的植物性状应处于强选择之下。然而，很少有研究表明有吸引力的性状的自然变异和自然变异之间的因果关系访问整个植物。在这里，我们研究花的数量和大小对野生萝卜的访问由两个类群的传粉者超过3年的影响，使用多元回归和实验减少这两个特征的组合。我们发现了强有力的，一致的证据表明，增加花的数量和大小的原因增加访问的蚜虫苍蝇。小蜜蜂的结果更难解释，因为多元回归和实验操作结果不一致。这是可能的，增加花的大小会导致一个微弱的增加小蜜蜂的访问，但强大的花数和小蜜蜂的访问之间的关系，在2年的观察研究中看到的，并没有得到证实的实验操作这个特性。小蜜蜂实际上可能对与花数相关的未测量性状做出了反应，或者当进行花数操纵时，小蜜蜂的丰度较低，这可能降低了我们检测因果关系的能力。我们的结论是，研究仅使用1年，一种方法，或测量只有一个特性可能无法提供足够的理解植物性状对传粉者吸引力的影响。
Plant traits that increase pollinator visitation should be under strong selection. However, few studies have demonstrated a causal link between natural variation in attractive traits and natural variation in visitation to whole plants. Here we examine the effects of flower number and size on visitation to wild radish by two taxa of pollinators over 3 years, using a combination of multiple regression and experimental reductions in both traits. We found strong, consistent evidence that increases in both flower number and size cause increased visitation by syrphid flies. The results for small bees were harder to interpret, because the multiple regression and experimental manipulation results did not agree. It is likely that increased flower size causes a weak increase in small-bee visitation, but strong relationships between flower number and small-bee visitation seen in 2 years of observational studies were not corroborated by experimental manipulation of this trait. Small bees may actually have responded to an unmeasured trait correlated with flower number, or lower small-bee abundances when the flower number manipulation was conducted may have reduced our ability to detect a causal relationship. We conclude that studies using only 1 year, one method, or measuring only one trait may not provide an adequate understanding of the effects of plant traits on pollinator attraction.