The potential for indirect effects between co-flowering plants via shared pollinators depends on resource abundance, accessibility and relatedness

Luísa Gigante Carvalheiro, Jacobus Christiaan Biesmeijer, Gita Benadi, Jochen Frund, Martina Stang, Ignasi Bartomeus, Christopher N. Kaiser-Bunbury, Mathilde Baude, Sofia I. F. Gomes, Vincent Merckx, Katherine C. R. Baldock, Andrew T. D. Bennett, Ruth Boada, Riccardo Bommarco, Ralph Cartar, Natacha Chacoff, Juliana Danhardt, Lynn V. Dicks, Carsten F. Dormann, Johan EkroosKate S. E. Henson, Andrea Holzschuh, Robert R. Junker, Martha Lopezaraiza-Mikel, Jane Memmott, Ana Montero-Castano, Isabel L. Nelson, Theodora Petanidou, Eileen F. Power, Maj Rundlof, Henrik G. Smith, Jane C. Stout, Kehinde Temitope, Teja Tscharntke, Thomas Tscheulin, Montserrat Vila, William E. Kunin

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Abstract

Co-flowering plant species commonly share flower visitors, and thus have the potential to influence each other's pollination. In this study we analysed 750 quantitative plant-pollinator networks from 28 studies representing diverse biomes worldwide. We show that the potential for one plant species to influence another indirectly via shared pollinators was greater for plants whose resources were more abundant (higher floral unit number and nectar sugar content) and more accessible. The potential indirect influence was also stronger between phylogenetically closer plant species and was independent of plant geographic origin (native vs. non-native). The positive effect of nectar sugar content and phylogenetic proximity was much more accentuated for bees than for other groups. Consequently, the impact of these factors depends on the pollination mode of plants, e.g. bee or fly pollinated. Our findings may help predict which plant species have the greatest importance in the functioning of plant-pollination networks.

Original languageEnglish
Pages (from-to)1389-1399
Number of pages11
JournalEcology Letters
Volume17
Issue number11
Early online date28 Aug 2014
DOIs
Publication statusPublished - Nov 2014

Keywords

  • Facilitation
  • floral traits
  • flower density
  • flower resources
  • indirect interactions
  • interspecific competition
  • morphological similarity
  • nectar
  • phylogenetic distance
  • plant-pollinator networks

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