Changes in pollinator fauna affect altitudinal variation of floral size in a bumblebee‐pollinated herb. Issue 17 (18th August 2014)

• Record Type: Journal Article
• Authors: Nagano, Yusuke; Abe, Kota; Kitazawa, Tomoaki; Hattori, Mitsuru; Hirao, Akira S.; Itino, Takao
• Is Part Of: Ecology and evolution. Volume 4:Issue 17(2014)
• Page Start: 3395
• Page End: 3407
• Publication Date: 2014-08-18
• Subjects: Ecology -- Periodicals; Evolution -- Periodicals; 577.05
• DOI: 10.1002/ece3.1191
• Languages: English
• ISSNs: 2045-7758

Abstract

<abstract abstract-type="main" id="ece31191-abs-0001"> <title>Abstract</title> <p>Geographic trait variations are often caused by locally different selection regimes. As a steep environmental cline along altitude strongly influences adaptive traits, mountain ecosystems are ideal for exploring adaptive differentiation over short distances. We investigated altitudinal floral size variation of <italic>Campanula punctata</italic> var. <italic>hondoensis</italic> in 12 populations in three mountain regions of central Japan to test whether the altitudinal floral size variation was correlated with the size of the local bumblebee pollinator and to assess whether floral size was selected for by pollinator size. We found apparent geographic variations in pollinator assemblages along altitude, which consequently produced a geographic change in pollinator size. Similarly, we found altitudinal changes in floral size, which proved to be correlated with the local pollinator size, but not with altitude itself. Furthermore, pollen removal from flower styles onto bees (plant's male fitness) was strongly influenced by the size match between flower style length and pollinator mouthpart length. These results strongly suggest that <italic>C. punctata</italic> floral size is under pollinator‐mediated selection and that a geographic mosaic of locally adapted <italic>C. punctata</italic> exists at fine spatial scale.</p> </abstract>