Pollination of Ipomopsis aggregata (Polemoniaceae): effects of intra- vs. interspecific competition.
Pollination of Ipomopsis aggregata (Polemoniaceae): effects of intra- vs. interspecific competition.
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Ipomopsis aggregata（Polemoniaceae）的授粉：种内竞争与种间竞争的影响。
DOI：
10.2307/2656575
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发表时间：
1999
影响因子：
3
通讯作者：
Christina M. Caruso
中科院分区：
文献类型：
--
作者：
Christina M. Caruso
虽然植物可能同时经历种内和种间的传粉竞争，但它们的相对强度很少被实验评估。然而，由于种内和种间竞争可能由不同的机制引起，它们对植物生态和进化的影响可能不同。为了确定种内和种间传粉竞争的相对强度，本文以聚波多冈（Ipomopsis aggregata）为焦点种，对异种的存在和同种的密度进行了控制。所有样地均有黑穗槐和柽柳，但有一半样地去掉了柽柳的花序，形成异种缺失处理。在每个样地内，将焦点植物周围5 m半径范围内的所有鸢尾花序去除，形成低同比密度实验单元，每1 m(2)的12株鸢尾被指定为高同比密度单元。有线缕草存在时，同生花粉沉积减少，但不受线缕草密度的影响。结果表明，虽然有山茱萸存在时，单果结实率降低了17%，但两种处理对单果结实率的影响均不显著。种间传粉竞争强于种内竞争。但这两个过程似乎都没有影响植物的适合度。
Although plants may simultaneously experience intra- and interspecific competition for pollination, their relative strength has rarely been experimentally evaluated. Yet because intra- and interspecific competition can be caused by different mechanisms, their effect on the ecology and evolution of plants may differ. To determine the relative strength of intra- and interspecific competition for pollination, I manipulated the presence of heterospecifics and density of conspecifics using Ipomopsis aggregata as the focal species. All plots contained I. aggregata and Castilleja linariaefolia, but C. linariaefolia inflorescences were removed from half of the plots to create the heterospecifics-absent treatment. Within each plot, all I. aggregata inflorescences were removed from a 5-m radius around a focal plant to create a low conspecific density experimental unit, and a group of 12 I. aggregata plants/1 m(2) was designated as a high conspecific density unit. Conspecific pollen deposition was reduced when C. linariaefolia was present but was not influenced by I. aggregata density. Although seed set per fruit was reduced by 17% when C. linariaefolia was present, it was not significantly influenced by either treatment. Interspecific competition for pollination is stronger than intraspecific competition in the I. aggregata-C. linariaefolia system, but neither process appears to influence plant fitness.