Nectar sugars and bird visitation define a floral niche for basidiomycetous yeast on the Canary Islands

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• 作者：Moritz Mittelbach (1)
  Andrey M Yurkov (2)
  Daniele Nocentini (3)
  Massimo Nepi (3)
  Maximilian Weigend (4)
  Dominik Begerow (1)
  
  1. Department of Geobotany ; - LS Evolution & Biodiversity of Plants ; Ruhr-University Bochum ; ND 1/150 / Universitaetsstr. 150 ; 44780 ; Bochum ; Germany
  2. Leibniz Institute DSMZ - German Collection of Microorganisms and Cell Cultures ; Braunschweig ; Germany
  3. Department of Life Sciences ; University of Siena ; Siena ; Italy
  4. Nees Institute for biodiversity of plants ; Rheinische Friedrich-Wilhelms-Universit盲t ; Bonn ; Germany
  
• 关键词：Basidiomycetes ; Bird pollination ; Boraginaceae ; Canary Islands ; Nectar ; dwelling yeast
• 刊名：BMC Ecology
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：15
• 期：1
• 全文大小：921 KB
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• 刊物主题：Ecology; Life Sciences, general;
• 出版者：BioMed Central
• ISSN：1472-6785

文摘

Background Studies on the diversity of yeasts in floral nectar were first carried out in the late 19th century. A narrow group of fermenting, osmophilous ascomycetes were regarded as exclusive specialists able to populate this unique and species poor environment. More recently, it became apparent that microorganisms might play an important role in the process of plant pollination. Despite the importance of these nectar dwelling yeasts, knowledge of the factors that drive their diversity and species composition is scarce. Results In this study, we linked the frequencies of yeast species in floral nectars from various host plants on the Canary Islands to nectar traits and flower visitors. We estimated the structuring impact of pollination syndromes (nectar volume, sugar concentration and sugar composition) on yeast diversity. The observed total yeast diversity was consistent with former studies, however, the present survey yielded additional basidiomycetous yeasts in unexpectedly high numbers. Our results show these basidiomycetes are significantly associated with ornithophilous flowers. Specialized ascomycetes inhabit sucrose-dominant nectars, but are surprisingly rare in nectar dominated by monosaccharides. Conclusions There are two conclusions from this study: (i) a shift of floral visitors towards ornithophily alters the likelihood of yeast inoculation in flowers, and (ii) low concentrated hexose-dominant nectar promotes colonization of flowers by basidiomycetes. In the studied floral system, basidiomycete yeasts are acknowledged as regular members of nectar. This challenges the current understanding that nectar is an ecological niche solely occupied by ascomycetous yeasts.