Allopatric genetic origins for sympatric host-plant shifts and race formation in Rhagoletis

被引:268
作者
Feder, JL
Berlocher, SH
Roethele, JB
Dambroski, H
Smith, JJ
Perry, WL
Gavrilovic, V
Filchak, KE
Rull, J
Aluja, M
机构
[1] Univ Notre Dame, Dept Biol Sci, Galvin Life Sci Ctr, Notre Dame, IN 46556 USA
[2] Univ Illinois, Dept Entomol, Urbana, IL 61801 USA
[3] Michigan State Univ, Dept Zool, E Lansing, MI 48824 USA
[4] Michigan State Univ, Lyman Briggs Sch, E Lansing, MI 48824 USA
[5] Illinois State Univ, Dept Biol Sci, Normal, IL 61790 USA
[6] Asociac Civil, Inst Ecol, Xalapa 91070, Veracruz, Mexico
关键词
D O I
10.1073/pnas.1730757100
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Tephritid fruit flies belonging to the Rhagoletis pomonella sibling species complex are controversial because they have been proposed to diverge in sympatry (in the absence of geographic isolation) by shifting and adapting to new host plants. Here, we report evidence suggesting a surprising source of genetic variation contributing to sympatric host shifts for these flies. From DNA sequence data for three nuclear loci and mtDNA, we infer that an ancestral, hawthorn-infesting R. pomonella population became geographically subdivided into Mexican and North American isolates approximate to1.57 million years ago. Episodes of gene flow from Mexico subsequently infused the North American population with inversion polymorphism affecting key diapause traits, forming adaptive clines. Sometime later (perhaps +/-1 million years), diapause variation in the latitudinal clines appears to have aided North American flies in adapting to a variety of plants with differing fruiting times, helping to spawn several new taxa. Thus, important raw genetic material facilitating the adaptive radiation of R. pomonella originated in a different time and place than the proximate ecological host shifts triggering sympatric divergence.
引用
收藏
页码:10314 / 10319
页数:6
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