DOI: 10.1073/pnas.2000388117
论文题名: Triad hybridization via a conduit species
作者: Grant P.R. ; Grant B.R.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期: 14 起始页码: 7888
结束页码: 7896
语种: 英语
英文关键词: Convergence
; Fitness
; Introgression
; Speciation
; Trihybrids
Scopus关键词: adaptive radiation
; allele
; article
; Daphne
; demography
; ecology
; finch
; gene flow
; genetic susceptibility
; human
; immigrant
; insect
; introgression
; nonhuman
; resident
; species differentiation
; animal
; beak
; breeding
; evolution
; genetics
; growth, development and aging
; hybridization
; vertebrate
; microsatellite DNA
; Alleles
; Animals
; Beak
; Biological Evolution
; Breeding
; Daphne
; Finches
; Hybridization, Genetic
; Microsatellite Repeats
; Vertebrates
英文摘要: Introgressive hybridization can affect the evolution of populations in several important ways. It may retard or reverse divergence of species, enable the development of novel traits, enhance the potential for future evolution by elevating levels of standing variation, create new species, and alleviate inbreeding depression in small populations. Most of what is known of contemporary hybridization in nature comes from the study of pairs of species, either coexisting in the same habitat or distributed parapatrically and separated by a hybrid zone. More rarely, three species form an interbreeding complex (triad), reported in vertebrates, insects, and plants. Often, one species acts as a genetic link or conduit for the passage of genes (alleles) between two others that rarely, if ever, hybridize. Demographic and genetic consequences are unknown. Here we report results of a long-term study of interbreeding Darwin's finches on Daphne Major island, Galápagos. Geospiza fortis acted as a conduit for the passage of genes between two others that have never been observed to interbreed on Daphne: Geospiza fuliginosa, a rare immigrant, and Geospiza scandens, a resident. Microsatellite gene flow from G. fortis into G. scandens increased in frequency during 30 y of favorable ecological conditions, resulting in genetic and morphological convergence. G. fortis, G. scandens, and the derived dihybrids and trihybrids experienced approximately equal fitness. Especially relevant to young adaptive radiations, where species differ principally in ecology and behavior, these findings illustrate how new combinations of genes created by hybridization among three species can enhance the potential for evolutionary change. © 2020 National Academy of Sciences. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164259
Appears in Collections: 气候变化与战略
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作者单位: Grant, P.R., Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, United States; Grant, B.R., Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, United States
Recommended Citation:
Grant P.R.,Grant B.R.. Triad hybridization via a conduit species[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(14)