The plot thickens: does low density affect visitation and reproductive success in a perennial herb, and are these effects altered in the presence of a co-flowering species?

Oecologia
Tracy S Feldman

Abstract

Plants may experience reduced reproductive success at low densities, due to lower numbers of pollinator visits or reduced visit quality. Co-occurring plant species that share pollinators have the potential to facilitate pollination by either increasing numbers of pollinator visits or increasing the quality of visits, but also have the potential to reduce plant reproductive success through competition for pollination. I used a field experiment with a common distylous perennial (Piriqueta caroliniana) in the presence and absence of a co-flowering species (Coreopsis leavenworthii) in plots with one of four different distances between conspecific plants. I found strong negative effects of increasing interplant distance (related to conspecific density) on several components of P. caroliniana reproductive success: pollinator visits to plants per plot visit, visits received by individual plants, conspecific pollen grains on stigmas, outcross pollen grains on stigmas, and probability of fruit production. Although P. caroliniana and C. leavenworthii share pollinators, the co-flowering species did not affect visitation, pollen receipt or reproductive effort in P. caroliniana. Pollinators moved very infrequently between species in this ex...Continue Reading

References

Aug 13, 2005·Biological Reviews of the Cambridge Philosophical Society·Jaboury Ghazoul
Dec 6, 2006·Oecologia·Jeff OllertonEllen Lamborn
Sep 25, 2008·The American Naturalist·M J Groom
Nov 1, 1999·Oecologia·I Steffan-Dewenter, Teja Tscharntke
Dec 1, 1987·Ecology·Andrew Sih, Marie-Sylvie Baltus

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Citations

Apr 13, 2011·Oecologia·Anke Christiane DietzschJane Catherine Stout
Nov 11, 2008·Proceedings of the Japan Academy. Series B, Physical and Biological Sciences·Minoru IsobeTsukasa Matsuda
Jun 24, 2017·Scientific Reports·Xoaquín MoreiraLuis Abdala-Roberts
Apr 3, 2020·Evolution; International Journal of Organic Evolution·Katherine E EisenMonica A Geber

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