Giant and Canadian goldenrods (Solidago gigantea and S. canadensis, respectively) are two closely related insect-pollinated plants of the family Asteraceae, native to North America and invasive in the Palearctic region. Here we study the structure of the flower-visitor community associated with these species in seven sites from three geographic locations in Central Russia throughout two flowering seasons, using qualitative (visitor set) and quantitative (visitation rate and relative frequency of different functional groups of flower-visiting insects) approaches. These species do not have a specific visitor set and are visited by a wide range of insects. Most differences in pollinator sets are in rare occasional visitors rather than specific ones preferring one of the two plant species. Hoverflies, honey bees, muscoid flies, and wasps are the most frequent visitors of goldenrods, though this generalization can be done only after obtaining large samples: brief observations at one site can bring about misleading results due to high spatial and temporal variation. Though intra-species spatial and temporal variation exceeds inter-species variation, all else equal, insect visitation rate to S. gigantea is higher. This is especially true of pronounced anthophilous insects. These results, together with the shown flower constancy of flower visitors, suggest that insects can distinguish between these two species.

巨人和加拿大。黄（一枝巨和加拿大一枝黄花分别是菊科的两种紧密相关的昆虫授粉植物，原产于北美，并在古太平洋地区入侵。在这里，我们使用定性（访客组）和定量（访客率和不同功能组的花的相对频率）在两个开花季节中从俄罗斯中部三个地理位置的七个地点研究了与这些物种相关的花访者群落的结构-参观昆虫）方法。这些物种没有特定的来访者组，并且被各种各样的昆虫来访。授粉媒介集的大多数差异是在罕见的偶然访客中，而不是喜欢这两种植物之一的特定访客。蚜虫，蜜蜂，粘液蝇和黄蜂是金毛病最常来的游客，尽管只能在获得大量样本之后才能进行这种概括：由于时空变化较大，在一个站点上进行简短观察可能会产生误导性的结果。尽管种内空间和时间的变化超过种间变化，但在其他所有条件相同的情况下，巨型链球菌较高。对于明显的嗜热昆虫尤其如此。这些结果，加上所显示的访客花的恒定性，表明昆虫可以区分这两种物种。