气候变化领域集成服务门户(CCPortal): Morphological ghosts of introgression in Darwin's finch populations

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DOI	10.1073/pnas.2107434118
	Morphological ghosts of introgression in Darwin's finch populations
	Grant P.R.; Grant B.R.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:31
英文摘要	Many species of plants, animals, and microorganisms exchange genes well after the point of evolutionary divergence at which taxonomists recognize them as species. Genomes contain signatures of past gene exchange and, in some cases, they reveal a legacy of lineages that no longer exist. But genomic data are not available for many organisms, and particularly problematic for reconstructing and interpreting evolutionary history are communities that have been depleted by extinctions. For these, morphology may substitute for genes, as exemplified by the history of Darwin's finches on the Galápagos islands of Floreana and San Cristóbal. Darwin and companions collected seven specimens of a uniquely large form of Geospiza magnirostris in 1835. The populations became extinct in the next few decades, partly due to destruction of Opuntia cactus by introduced goats, whereas Geospiza fortis has persisted to the present. We used measurements of large samples of G. fortis collected for museums in the period 1891 to 1906 to test for unusually large variances and skewed distributions of beak and body size resulting from introgression. We found strong evidence of hybridization on Floreana but not on San Cristóbal. The skew is in the direction of the absent G. magnirostris. We estimate introgression influenced 6% of the frequency distribution that was eroded by selection after G. magnirostris became extinct on these islands. The genetic residuum of an extinct species in an extant one has implications for its future evolution, as well as for a conservation program of reintroductions in extinction-depleted communities. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Beak size; Darwin's finches; Extinction; Introgression; Reintroduction
语种	英语
scopus关键词	animal experiment; animal tissue; article; beak; body size; destruction; extinct species; finch; goat; information center; introgression; nonhuman; Opuntia
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238669
作者单位	Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, United States
推荐引用方式 GB/T 7714	Grant P.R.,Grant B.R.. Morphological ghosts of introgression in Darwin's finch populations[J],2021,118(31).
APA	Grant P.R.,&Grant B.R..(2021).Morphological ghosts of introgression in Darwin's finch populations.Proceedings of the National Academy of Sciences of the United States of America,118(31).
MLA	Grant P.R.,et al."Morphological ghosts of introgression in Darwin's finch populations".Proceedings of the National Academy of Sciences of the United States of America 118.31(2021).