Are flightless Galapaganus weevils older than the Galapagos islands they inhabit?

The 15 species in the weevil genus Galapaganus Lanteri 1992 (Entiminae: Curculionidae: Coleoptera) are distributed on coastal Peril and Ecuador and include 10 flightless species endemic to the Galapagos islands. These beetles thus provide a promising system through which to investigate the patterns...

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Autores principales:	Sequeira, Andrea Silvia, Scataglini, María Amalia, Confalonieri, Viviana Andrea
Publicado:	2000
Materias:	Cytochrome oxidase I DNA sequences Island biogeography Progression rule Speciation Taxon cycle cytochrome oxidase Ecuador enzyme subunit evolution Galapagos Island gene locus genetic distance geographic distribution mitochondrial DNA morphology beetle endemic species geology island Animals Beetles DNA, Mitochondrial Electron Transport Complex IV Evolution Evolution, Molecular Models, Genetic Phylogeny Polymerase Chain Reaction Sequence Analysis, DNA Time Factors Arthropoda Coleoptera Curculionidae Entiminae Galapaganus Galapaganus galapagoensis Gekkonidae Iguania Squamata
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0018067X_v85_n1_p20_Sequeira http://hdl.handle.net/20.500.12110/paper_0018067X_v85_n1_p20_Sequeira
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_0018067X_v85_n1_p20_Sequeira
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spelling	paper:paper_0018067X_v85_n1_p20_Sequeira2023-06-08T14:39:26Z Are flightless Galapaganus weevils older than the Galapagos islands they inhabit? Sequeira, Andrea Silvia Scataglini, María Amalia Confalonieri, Viviana Andrea Cytochrome oxidase I DNA sequences Island biogeography Progression rule Speciation Taxon cycle cytochrome oxidase Ecuador enzyme subunit evolution Galapagos Island gene locus genetic distance geographic distribution mitochondrial DNA morphology beetle endemic species evolution geology island Animals Beetles DNA, Mitochondrial Ecuador Electron Transport Complex IV Evolution Evolution, Molecular Models, Genetic Phylogeny Polymerase Chain Reaction Sequence Analysis, DNA Time Factors Ecuador Arthropoda Coleoptera Curculionidae Entiminae Galapaganus Galapaganus galapagoensis Gekkonidae Iguania Squamata The 15 species in the weevil genus Galapaganus Lanteri 1992 (Entiminae: Curculionidae: Coleoptera) are distributed on coastal Peril and Ecuador and include 10 flightless species endemic to the Galapagos islands. These beetles thus provide a promising system through which to investigate the patterns and processes of evolution on Darwin's archipelago. Sequences of the mtDNA locus encoding cytochrome oxidase subunit I (COI) were obtained from samples of seven species occurring in different ecological zones of the oldest south-eastern islands: San Cristobal, Espanola and Floreana, and the central island Santa Cruz. The single most parsimonious tree obtained shows two well-supported clades that correspond to the species groups previously defined by morphological characters. Based on a mtDNA clock calibrated for arthropods, the initial speciation separating the oldest species, G. galapagoensis (Linell) on the oldest island, San Cristobal, from the remaining species in the Galapagos occurred about 7.2 Ma. This estimate exceeds geological ages of the extant emerged islands, although it agrees well with molecular dating of endemic Galapagos iguanas, geckos and lizards. An apparent explanation for the disagreement between geological and molecular time-frames is that about 7 Ma there were emerged islands which subsequently disappeared under ocean waters. This hypothesis has gained support from the recent findings of 11 -Myr-old submarine seamounts (sunken islands), south-east of the present location of the archipelago. Some species within the darwini group may have differentiated on the extant islands, 1-5 Ma. Fil:Sequeira, A.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Scataglini, M.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Confalonieri, V.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2000 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0018067X_v85_n1_p20_Sequeira http://hdl.handle.net/20.500.12110/paper_0018067X_v85_n1_p20_Sequeira
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Cytochrome oxidase I DNA sequences Island biogeography Progression rule Speciation Taxon cycle cytochrome oxidase Ecuador enzyme subunit evolution Galapagos Island gene locus genetic distance geographic distribution mitochondrial DNA morphology beetle endemic species evolution geology island Animals Beetles DNA, Mitochondrial Ecuador Electron Transport Complex IV Evolution Evolution, Molecular Models, Genetic Phylogeny Polymerase Chain Reaction Sequence Analysis, DNA Time Factors Ecuador Arthropoda Coleoptera Curculionidae Entiminae Galapaganus Galapaganus galapagoensis Gekkonidae Iguania Squamata
spellingShingle	Cytochrome oxidase I DNA sequences Island biogeography Progression rule Speciation Taxon cycle cytochrome oxidase Ecuador enzyme subunit evolution Galapagos Island gene locus genetic distance geographic distribution mitochondrial DNA morphology beetle endemic species evolution geology island Animals Beetles DNA, Mitochondrial Ecuador Electron Transport Complex IV Evolution Evolution, Molecular Models, Genetic Phylogeny Polymerase Chain Reaction Sequence Analysis, DNA Time Factors Ecuador Arthropoda Coleoptera Curculionidae Entiminae Galapaganus Galapaganus galapagoensis Gekkonidae Iguania Squamata Sequeira, Andrea Silvia Scataglini, María Amalia Confalonieri, Viviana Andrea Are flightless Galapaganus weevils older than the Galapagos islands they inhabit?
topic_facet	Cytochrome oxidase I DNA sequences Island biogeography Progression rule Speciation Taxon cycle cytochrome oxidase Ecuador enzyme subunit evolution Galapagos Island gene locus genetic distance geographic distribution mitochondrial DNA morphology beetle endemic species evolution geology island Animals Beetles DNA, Mitochondrial Ecuador Electron Transport Complex IV Evolution Evolution, Molecular Models, Genetic Phylogeny Polymerase Chain Reaction Sequence Analysis, DNA Time Factors Ecuador Arthropoda Coleoptera Curculionidae Entiminae Galapaganus Galapaganus galapagoensis Gekkonidae Iguania Squamata
description	The 15 species in the weevil genus Galapaganus Lanteri 1992 (Entiminae: Curculionidae: Coleoptera) are distributed on coastal Peril and Ecuador and include 10 flightless species endemic to the Galapagos islands. These beetles thus provide a promising system through which to investigate the patterns and processes of evolution on Darwin's archipelago. Sequences of the mtDNA locus encoding cytochrome oxidase subunit I (COI) were obtained from samples of seven species occurring in different ecological zones of the oldest south-eastern islands: San Cristobal, Espanola and Floreana, and the central island Santa Cruz. The single most parsimonious tree obtained shows two well-supported clades that correspond to the species groups previously defined by morphological characters. Based on a mtDNA clock calibrated for arthropods, the initial speciation separating the oldest species, G. galapagoensis (Linell) on the oldest island, San Cristobal, from the remaining species in the Galapagos occurred about 7.2 Ma. This estimate exceeds geological ages of the extant emerged islands, although it agrees well with molecular dating of endemic Galapagos iguanas, geckos and lizards. An apparent explanation for the disagreement between geological and molecular time-frames is that about 7 Ma there were emerged islands which subsequently disappeared under ocean waters. This hypothesis has gained support from the recent findings of 11 -Myr-old submarine seamounts (sunken islands), south-east of the present location of the archipelago. Some species within the darwini group may have differentiated on the extant islands, 1-5 Ma.
author	Sequeira, Andrea Silvia Scataglini, María Amalia Confalonieri, Viviana Andrea
author_facet	Sequeira, Andrea Silvia Scataglini, María Amalia Confalonieri, Viviana Andrea
author_sort	Sequeira, Andrea Silvia
title	Are flightless Galapaganus weevils older than the Galapagos islands they inhabit?
title_short	Are flightless Galapaganus weevils older than the Galapagos islands they inhabit?
title_full	Are flightless Galapaganus weevils older than the Galapagos islands they inhabit?
title_fullStr	Are flightless Galapaganus weevils older than the Galapagos islands they inhabit?
title_full_unstemmed	Are flightless Galapaganus weevils older than the Galapagos islands they inhabit?
title_sort	are flightless galapaganus weevils older than the galapagos islands they inhabit?
publishDate	2000
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0018067X_v85_n1_p20_Sequeira http://hdl.handle.net/20.500.12110/paper_0018067X_v85_n1_p20_Sequeira
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Are flightless Galapaganus weevils older than the Galapagos islands they inhabit?

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