Biodiversity Science ›› 2012, Vol. 20 ›› Issue (3): 400-404.doi: 10.3724/SP.J.1003.2012.05033

Special Issue: Polination Biology: Theory and Primary Practice

• Research Bulletins • Previous Article     Next Article

Who are the major pollinators of Chimonanthus praecox (Calycanthaceae): insect behaviors and potential pollination roles

Wei Du1, Shuai Wang1, Manqun Wang2, Xiaofan Wang1*   

  1. 1College of Life Sciences, Wuhan University, Wuhan 430072

    2College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070
  • Received:2012-01-30 Revised:2012-03-12 Online:2012-05-09
  • Xiaofan Wang

Variable insect behaviors may result in different flower visiting frequencies, which may result in diverse impacts on plant pollination. Although flies, hoverflies, and Italian bees (Apis mellifera ligustica) were the most common visitors of Chimonanthus praecox, these insect groups had disparate visiting behaviors. Flies traveled quickly, and crawled or jumped between flowers. Italian bees also flew quickly or occasionally crawled between flowers. In contrast, hoverflies generally spent a majority of time foraging on a given flower. Based on the average foraging time and inter-floral flight time, one Italian bee could visit 4.57 flowers per minute, whereas individual bees and hoverflies could visit 2.65 and 0.53 flowers on average, respectively. After incorporating the total number of individuals for each insect group, we extrapolated the visiting rates of Italian bees, flies and hoverflies as 498.19, 1,089.74 and 99.78 flowers per minute, respectively. Flies and Italian bees had higher pollination effectiveness (number of pollinated flowers by the same number of visitors in a given time interval under the same condition), with estimates of 93% and 100% (n = 30), respectively, while only 13% (n = 30) for hoverflies. If we consider the pollen load ability and pollination effectiveness for Italian bees and flies, visiting rate may be the main limiting factor for their potential in pollinating flowers. Thus following these conclusions, flies are the major pollinators of C. praecox, followed by Italian bees (pollination role was limited by their low number) and hoverflies (limited by their foraging and hovering behaviors and lower pollination effectiveness).

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