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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2000
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_0018067X_v85_n1_p20_Sequeira https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_0018067X_v85_n1_p20_Sequeira_oai |
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I28-R145-paper_0018067X_v85_n1_p20_Sequeira_oai2024-08-16 Sequeira, A.S. Lanteri, A.A. Scataglini, M.A. Confalonieri, V.A. Farrell, B.D. 2000 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. application/pdf http://hdl.handle.net/20.500.12110/paper_0018067X_v85_n1_p20_Sequeira info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Heredity 2000;85(1):20-29 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 Are flightless Galapaganus weevils older than the Galapagos islands they inhabit? info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_0018067X_v85_n1_p20_Sequeira_oai |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-145 |
| collection |
Repositorio Digital de la Universidad de Buenos Aires (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, A.S. Lanteri, A.A. Scataglini, M.A. Confalonieri, V.A. Farrell, B.D. 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. |
| format |
Artículo Artículo publishedVersion |
| author |
Sequeira, A.S. Lanteri, A.A. Scataglini, M.A. Confalonieri, V.A. Farrell, B.D. |
| author_facet |
Sequeira, A.S. Lanteri, A.A. Scataglini, M.A. Confalonieri, V.A. Farrell, B.D. |
| author_sort |
Sequeira, A.S. |
| 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 |
http://hdl.handle.net/20.500.12110/paper_0018067X_v85_n1_p20_Sequeira https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_0018067X_v85_n1_p20_Sequeira_oai |
| work_keys_str_mv |
AT sequeiraas areflightlessgalapaganusweevilsolderthanthegalapagosislandstheyinhabit AT lanteriaa areflightlessgalapaganusweevilsolderthanthegalapagosislandstheyinhabit AT scataglinima areflightlessgalapaganusweevilsolderthanthegalapagosislandstheyinhabit AT confalonieriva areflightlessgalapaganusweevilsolderthanthegalapagosislandstheyinhabit AT farrellbd areflightlessgalapaganusweevilsolderthanthegalapagosislandstheyinhabit |
| _version_ |
1809356866578284544 |