Plant-pollinator interactions and floral convergence in two species of Heliconia from the Caribbean Islands

被引:19
|
作者
Marten-Rodriguez, Silvana [1 ]
Kress, W. John [1 ]
Temeles, Ethan J. [2 ]
Melendez-Ackerman, Elvia [3 ]
机构
[1] Natl Museum Nat Hist, Dept Bot, MRC 166, Smithsonian Inst, Washington, DC 20013 USA
[2] Amherst Coll, Dept Biol, Amherst, MA 01002 USA
[3] Univ Puerto Rico Rio Piedras, Inst Trop Ecosyst Studies, San Juan, PR 00936 USA
关键词
Convergent evolution; Heliconia; Hummingbird; Islands; Pollination; SEXUAL-DIMORPHISM; HUMMINGBIRD; POPULATIONS; ADAPTATION; EVOLUTION; ECOLOGY; SHAPE; SIZE;
D O I
10.1007/s00442-011-2043-8
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Variation in interspecific interactions across geographic space is a potential driver of diversification and local adaptation. This study quantitatively examined variation in floral phenotypes and pollinator service of Heliconia bihai and H. caribaea across three Antillean islands. The prediction was that floral characters would correspond to the major pollinators of these species on each island. Analysis of floral phenotypes revealed convergence among species and populations of Heliconia from the Greater Antilles. All populations of H. caribaea were similar, characterized by long nectar chambers and short corolla tubes. In contrast, H. bihai populations were strongly divergent: on Dominica, H. bihai had flowers with short nectar chambers and long corollas, whereas on Hispaniola, H. bihai flowers resembled those of H. caribaea with longer nectar chambers and shorter corolla tubes. Morphological variation in floral traits corresponded with geographic differences or similarities in the major pollinators on each island. The Hispaniolan mango, Anthracothorax dominicus, is the principal pollinator of both H. bihai and H. caribaea on Hispaniola; thus, the similarity of floral phenotypes between Heliconia species suggests parallel selective regimes imposed by the principal pollinator. Likewise, divergence between H. bihai populations from Dominica and Hispaniola corresponded with differences in the pollinators visiting this species on the two islands. The study highlights the putative importance of pollinator-mediated selection as driving floral convergence and the evolution of locally-adapted plant variants across a geographic mosaic of pollinator species.
引用
收藏
页码:1075 / 1083
页数:9
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