Abstract
Showy invasive alien plants are often integrated in the diet of generalist pollinators and because of the lack of co-evolvement with the native plant community, a high amount of interspecific pollen transfer (IPT) can be expected. We investigated pollinator switching and magnitude plus distance of IPT between the alien aquatic Ludwigia grandiflora and the native Lythrum salicaria in both directions in uninvaded and invaded sites with a different relative abundance of L. grandiflora (% cover of the alien plant: no cover; low cover: <5%; high cover: 50–75%). A field experiment was conducted to include both pollinator interspecific movements and tracking of IPT, using fluorescent dye as a pollen analogue. Despite a substantial overlap in pollinators between L. grandiflora and the native L. salicaria, less than 10% of the observed flights were interspecific. Similar results were found in dye transfer patterns. The proportions of stigmas with conspecific dye were always higher than the proportions of stigmas with heterospecific dye for L grandiflora and L. salicaria. There were no differences in conspecific dye loads for L. salicaria between uninvaded and invaded sites. Conspecific pollen loss (native CPL) and heterospecific pollen deposition (alien HPD) were in general low and species-specific. The distance of HPD ranged respectively from 1.7 to 39 m and from 0.3 to 54.8 m in the low cover and high cover sites while CPL ranged respectively from 6.40 to 68.02 m and from 0.60 to 40.18 m in the low cover and high cover sites. We can conclude that, in this system, CPL and HPD will play a minor role in pollinator-mediated interaction. Furthermore, interspecific competition for pollinators will cover a larger distance than just neighboring individuals. Our results suggest the necessity to consider the combined effect of insect visitation, pollen deposition, relative alien abundance, distance and seed set when investigating pollinator-mediated interactions of invasive plants.
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Acknowledgements
We thank K. Coussement for field and laboratory assistance, L. Brans, T. Glorieux, T. Sierens, R. Stiers and M. Vanderlinden for field assistance, Prof. B. Vanschoenwinkel and Dr. F. Van Rossum for their advice on statistical analyses and modeling of the dye dispersal curves and the laboratory of Cellular Genetics (VUB) for microscope disposal. We thank the associate editor and three anonymous reviewers for their valuable suggestions on a previous version of the paper. This research was part of the project ‘ALIEN IMPACT’ financed by the Belgian Science Policy, contract number SD/BD/01A and the Vrije Universiteit Brussel (BAS 42).
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Stiers, I., Triest, L. Low interspecific pollen transfer between invasive aquatic Ludwigia grandiflora and native co-flowering plants. Biol Invasions 19, 2913–2925 (2017). https://doi.org/10.1007/s10530-017-1494-1
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DOI: https://doi.org/10.1007/s10530-017-1494-1