Cryptic speciation in a model invertebrate chordate
We applied independent species concepts to clarify the phylogeographic structure of the ascidian Ciona intestinalis, a powerful model system in chordate biology and for comparative genomic studies. Intensive research with this marine invertebrate is based on the assumption that natural populations g...
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ftpubmed:oai:pubmedcentral.nih.gov:1890500 2023-05-15T17:33:15+02:00 Cryptic speciation in a model invertebrate chordate Caputi, Luigi Andreakis, Nikos Mastrototaro, Francesco Cirino, Paola Vassillo, Mauro Sordino, Paolo 2007-05-29 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1890500 http://www.ncbi.nlm.nih.gov/pubmed/17517633 https://doi.org/10.1073/pnas.0610158104 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1890500 http://www.ncbi.nlm.nih.gov/pubmed/17517633 http://dx.doi.org/10.1073/pnas.0610158104 © 2007 by The National Academy of Sciences of the USA Biological Sciences Text 2007 ftpubmed https://doi.org/10.1073/pnas.0610158104 2013-08-31T22:00:36Z We applied independent species concepts to clarify the phylogeographic structure of the ascidian Ciona intestinalis, a powerful model system in chordate biology and for comparative genomic studies. Intensive research with this marine invertebrate is based on the assumption that natural populations globally belong to a single species. Therefore, understanding the true taxonomic classification may have implications for experimental design and data management. Phylogenies inferred from mitochondrial and nuclear DNA markers accredit the existence of two cryptic species: C. intestinalis sp. A, genetically homogeneous, distributed in the Mediterranean, northeast Atlantic, and Pacific, and C. intestinalis sp. B, geographically structured and encountered in the North Atlantic. Species-level divergence is further entailed by cross-breeding estimates. C. intestinalis A and B from allopatric populations cross-fertilize, but hybrids remain infertile because of defective gametogenesis. Although anatomy illustrates an overall interspecific similarity lacking in diagnostic features, we provide consistent tools for in-field and in-laboratory species discrimination. Finding of two cryptic taxa in C. intestinalis raises interest in a new tunicate genome as a gateway to studies in speciation and ecological adaptation of chordates. Text North Atlantic Northeast Atlantic PubMed Central (PMC) Pacific Proceedings of the National Academy of Sciences 104 22 9364 9369 |
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Biological Sciences |
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Biological Sciences Caputi, Luigi Andreakis, Nikos Mastrototaro, Francesco Cirino, Paola Vassillo, Mauro Sordino, Paolo Cryptic speciation in a model invertebrate chordate |
topic_facet |
Biological Sciences |
description |
We applied independent species concepts to clarify the phylogeographic structure of the ascidian Ciona intestinalis, a powerful model system in chordate biology and for comparative genomic studies. Intensive research with this marine invertebrate is based on the assumption that natural populations globally belong to a single species. Therefore, understanding the true taxonomic classification may have implications for experimental design and data management. Phylogenies inferred from mitochondrial and nuclear DNA markers accredit the existence of two cryptic species: C. intestinalis sp. A, genetically homogeneous, distributed in the Mediterranean, northeast Atlantic, and Pacific, and C. intestinalis sp. B, geographically structured and encountered in the North Atlantic. Species-level divergence is further entailed by cross-breeding estimates. C. intestinalis A and B from allopatric populations cross-fertilize, but hybrids remain infertile because of defective gametogenesis. Although anatomy illustrates an overall interspecific similarity lacking in diagnostic features, we provide consistent tools for in-field and in-laboratory species discrimination. Finding of two cryptic taxa in C. intestinalis raises interest in a new tunicate genome as a gateway to studies in speciation and ecological adaptation of chordates. |
format |
Text |
author |
Caputi, Luigi Andreakis, Nikos Mastrototaro, Francesco Cirino, Paola Vassillo, Mauro Sordino, Paolo |
author_facet |
Caputi, Luigi Andreakis, Nikos Mastrototaro, Francesco Cirino, Paola Vassillo, Mauro Sordino, Paolo |
author_sort |
Caputi, Luigi |
title |
Cryptic speciation in a model invertebrate chordate |
title_short |
Cryptic speciation in a model invertebrate chordate |
title_full |
Cryptic speciation in a model invertebrate chordate |
title_fullStr |
Cryptic speciation in a model invertebrate chordate |
title_full_unstemmed |
Cryptic speciation in a model invertebrate chordate |
title_sort |
cryptic speciation in a model invertebrate chordate |
publisher |
National Academy of Sciences |
publishDate |
2007 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1890500 http://www.ncbi.nlm.nih.gov/pubmed/17517633 https://doi.org/10.1073/pnas.0610158104 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic Northeast Atlantic |
genre_facet |
North Atlantic Northeast Atlantic |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1890500 http://www.ncbi.nlm.nih.gov/pubmed/17517633 http://dx.doi.org/10.1073/pnas.0610158104 |
op_rights |
© 2007 by The National Academy of Sciences of the USA |
op_doi |
https://doi.org/10.1073/pnas.0610158104 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
104 |
container_issue |
22 |
container_start_page |
9364 |
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9369 |
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1766131694841102336 |