Cytogenetics of a parthenogenetic Arctic species of Micropsectra (Diptera, Chironomidae)
Micropsectra sedna (Oliver, 1976) is a parthenogenetic midge from the Canadian Arctic. The parthenogenetic mechanism is apomictic thelytoky, with a restitutional division during oogenesis, as found in other parthenogenetic Chironomidae. It is triploid, with two similar chromosome sets, and the third...
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ftdoajarticles:oai:doaj.org/article:8726e533249c4e89b79ea59cae54607e 2023-05-15T14:54:03+02:00 Cytogenetics of a parthenogenetic Arctic species of Micropsectra (Diptera, Chironomidae) David Porter Jon Martin 2011-11-01T00:00:00Z https://doi.org/10.3897/compcytogen.v5i4.1356 https://doaj.org/article/8726e533249c4e89b79ea59cae54607e EN eng Pensoft Publishers http://compcytogen.pensoft.net/lib/ajax_srv/article_elements_srv.php?action=download_pdf&item_id=1731 https://doaj.org/toc/1993-0771 https://doaj.org/toc/1993-078X 1993-0771 1993-078X doi:10.3897/compcytogen.v5i4.1356 https://doaj.org/article/8726e533249c4e89b79ea59cae54607e Comparative Cytogenetics, Vol 5, Iss 4, Pp 315-328 (2011) Genetics QH426-470 article 2011 ftdoajarticles https://doi.org/10.3897/compcytogen.v5i4.1356 2022-12-31T12:31:43Z Micropsectra sedna (Oliver, 1976) is a parthenogenetic midge from the Canadian Arctic. The parthenogenetic mechanism is apomictic thelytoky, with a restitutional division during oogenesis, as found in other parthenogenetic Chironomidae. It is triploid, with two similar chromosome sets, and the third is relatively dissimilar, pairing little with the diploid set. Two karyotypes were observed: a single individual with eight polytene elements in the salivary glands (3n=12), considered standard, while the majority of larvae showed only seven polytene chromosomes (3n=11). Hybrid speciation is considered likely, although chromosomal recombination following the origin of thelytoky has played some part in karyotype evolution. A single morphologically distinct larva was also found, which might be the donor of the haploid chromosome set. The apomictic restitutional system is compared to that of the other, independently derived, parthenogenetic Chironomids to assess the extent of similarity between species. Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Comparative Cytogenetics 5 4 315 328 |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Genetics QH426-470 |
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Genetics QH426-470 David Porter Jon Martin Cytogenetics of a parthenogenetic Arctic species of Micropsectra (Diptera, Chironomidae) |
topic_facet |
Genetics QH426-470 |
description |
Micropsectra sedna (Oliver, 1976) is a parthenogenetic midge from the Canadian Arctic. The parthenogenetic mechanism is apomictic thelytoky, with a restitutional division during oogenesis, as found in other parthenogenetic Chironomidae. It is triploid, with two similar chromosome sets, and the third is relatively dissimilar, pairing little with the diploid set. Two karyotypes were observed: a single individual with eight polytene elements in the salivary glands (3n=12), considered standard, while the majority of larvae showed only seven polytene chromosomes (3n=11). Hybrid speciation is considered likely, although chromosomal recombination following the origin of thelytoky has played some part in karyotype evolution. A single morphologically distinct larva was also found, which might be the donor of the haploid chromosome set. The apomictic restitutional system is compared to that of the other, independently derived, parthenogenetic Chironomids to assess the extent of similarity between species. |
format |
Article in Journal/Newspaper |
author |
David Porter Jon Martin |
author_facet |
David Porter Jon Martin |
author_sort |
David Porter |
title |
Cytogenetics of a parthenogenetic Arctic species of Micropsectra (Diptera, Chironomidae) |
title_short |
Cytogenetics of a parthenogenetic Arctic species of Micropsectra (Diptera, Chironomidae) |
title_full |
Cytogenetics of a parthenogenetic Arctic species of Micropsectra (Diptera, Chironomidae) |
title_fullStr |
Cytogenetics of a parthenogenetic Arctic species of Micropsectra (Diptera, Chironomidae) |
title_full_unstemmed |
Cytogenetics of a parthenogenetic Arctic species of Micropsectra (Diptera, Chironomidae) |
title_sort |
cytogenetics of a parthenogenetic arctic species of micropsectra (diptera, chironomidae) |
publisher |
Pensoft Publishers |
publishDate |
2011 |
url |
https://doi.org/10.3897/compcytogen.v5i4.1356 https://doaj.org/article/8726e533249c4e89b79ea59cae54607e |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Comparative Cytogenetics, Vol 5, Iss 4, Pp 315-328 (2011) |
op_relation |
http://compcytogen.pensoft.net/lib/ajax_srv/article_elements_srv.php?action=download_pdf&item_id=1731 https://doaj.org/toc/1993-0771 https://doaj.org/toc/1993-078X 1993-0771 1993-078X doi:10.3897/compcytogen.v5i4.1356 https://doaj.org/article/8726e533249c4e89b79ea59cae54607e |
op_doi |
https://doi.org/10.3897/compcytogen.v5i4.1356 |
container_title |
Comparative Cytogenetics |
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5 |
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4 |
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315 |
op_container_end_page |
328 |
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1766325745955635200 |