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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ftpensoft:10.3897/compcytogen.v5i4.1356 2023-05-15T14:54:06+02:00 Cytogenetics of a parthenogenetic Arctic species of Micropsectra (Diptera, Chironomidae) Porter,David Martin,Jon 2011 text/html https://doi.org/10.3897/compcytogen.v5i4.1356 https://compcytogen.pensoft.net/article/1731/ en eng Pensoft Publishers info:eu-repo/semantics/altIdentifier/eissn/1993-078X info:eu-repo/semantics/altIdentifier/pissn/1993-0771 info:eu-repo/semantics/openAccess Comparative Cytogenetics 5(4): 315-328 Chironomidae parthenogenesis polytene chromosomes hybridization chromosome recombination Research Article 2011 ftpensoft https://doi.org/10.3897/compcytogen.v5i4.1356 2022-03-01T12:25:07Z 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 Pensoft Publishers Arctic Comparative Cytogenetics 5 4 315 328 |
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Open Polar |
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Pensoft Publishers |
op_collection_id |
ftpensoft |
language |
English |
topic |
Chironomidae parthenogenesis polytene chromosomes hybridization chromosome recombination |
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Chironomidae parthenogenesis polytene chromosomes hybridization chromosome recombination Porter,David Martin,Jon Cytogenetics of a parthenogenetic Arctic species of Micropsectra (Diptera, Chironomidae) |
topic_facet |
Chironomidae parthenogenesis polytene chromosomes hybridization chromosome recombination |
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 |
Porter,David Martin,Jon |
author_facet |
Porter,David Martin,Jon |
author_sort |
Porter,David |
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://compcytogen.pensoft.net/article/1731/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Comparative Cytogenetics 5(4): 315-328 |
op_relation |
info:eu-repo/semantics/altIdentifier/eissn/1993-078X info:eu-repo/semantics/altIdentifier/pissn/1993-0771 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3897/compcytogen.v5i4.1356 |
container_title |
Comparative Cytogenetics |
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5 |
container_issue |
4 |
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315 |
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328 |
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1766325796286234624 |