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Changes in pollinator fauna affect altitudinal variation of floral size in a bumblebee‐pollinated herb
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Changes in pollinator fauna affect altitudinal variation of floral size in a bumblebee‐pollinated herb
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Journal Article
Changes in pollinator fauna affect altitudinal variation of floral size in a bumblebee‐pollinated herb
2014
Overview
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 Campanula punctata var. hondoensis 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 C. punctata floral size is under pollinator‐mediated selection and that a geographic mosaic of locally adapted C. punctata exists at fine spatial scale. Altitudinal floral size variation of Campanula punctata var. hondoensis in 12 populations in three mountain regions of central Japan was correlated with the size of the local bumblebee pollinator, but not with altitude itself. 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 C. punctata floral size is under pollinator‐mediated selection, and that a geographic mosaic of locally adapted C. punctata exists at fine spatial scale.
