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 S., Lanteri, Analía Alicia, Scataglini, M. Amalia, Confalonieri, Viviana A., Farrell, Brian D.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2000
Materias:
Ciencias Naturales
Cytochrome oxidase I
DNA sequences
Island biogeography
Progression rule
Speciation
Taxon cycle
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83538
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83538
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Cytochrome oxidase I
DNA sequences
Island biogeography
Progression rule
Speciation
Taxon cycle
spellingShingle Ciencias Naturales
Cytochrome oxidase I
DNA sequences
Island biogeography
Progression rule
Speciation
Taxon cycle
Sequeira, Andrea S.
Lanteri, Analía Alicia
Scataglini, M. Amalia
Confalonieri, Viviana A.
Farrell, Brian D.
Are flightless Galapaganus weevils older than the Galapagos islands they inhabit?
topic_facet Ciencias Naturales
Cytochrome oxidase I
DNA sequences
Island biogeography
Progression rule
Speciation
Taxon cycle
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 Articulo
Articulo
author Sequeira, Andrea S.
Lanteri, Analía Alicia
Scataglini, M. Amalia
Confalonieri, Viviana A.
Farrell, Brian D.
author_facet Sequeira, Andrea S.
Lanteri, Analía Alicia
Scataglini, M. Amalia
Confalonieri, Viviana A.
Farrell, Brian D.
author_sort Sequeira, Andrea 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://sedici.unlp.edu.ar/handle/10915/83538
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