umu.sePublikasjoner
Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Evolution of asexuality in insects: Polyploidy, hybridization and geographical parthenogenesis
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för molekylärbiologi (Teknisk-naturvetenskaplig fakultet).
2007 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Asexual reproduction and polyploidy are relatively rare in animals with chromosomal sex determination and always represent a derived condition. To accomplish asexual reproduction several changes in gene expression are required in the mechanism of oogenesis. Polyploidy increases the cell volume and also gives rise to alterations in general physiology. Nevertheless, there are asexual animals that not only survive but seem to be doing better than their sexual progenitors. This is expressed in the distribution pattern called geographical parthenogenesis. Using molecular phylogeny, I here examine the evolution of Otiorynchid weevils, mainly Otiorhynchus scaber and sulcatus in an attempt to trace the evolutionary history and find out what causes the variation in success of different parthenogens. I also evaluate the contribution of asexuality, hybridity and polyploidy as explanations behind geographical parthenogenesis in insects. I conclude that what is called O. scaber is, in fact, a set of geographical polyploids as polyploidy and not asexuality explains the difference in clonal success. I also argue that O. sulcatus is a recently formed clonal species of non-hybrid origin that may well be a good example of a true general purpose genotype. I find little support for asexuality or a hybrid origin as explanations behind geographical parthenogenesis in insects. Finally, I argue that polyploidy in all eukaryotes should be seen as an opportunity for the species evolution, not as a limitation that ensures the demise of the taxa.

sted, utgiver, år, opplag, sider
Umeå: Molekylärbiologi (Teknisk-naturvetenskaplig fakultet) , 2007. , s. 68
Emneord [en]
Molecular genetics, weevils, geographical parthenogenesis, hybridization, polyploidy
Emneord [sv]
Genetik
Emneord [la]
Otiorhynchus
Forskningsprogram
genetik
Identifikatorer
URN: urn:nbn:se:umu:diva-980ISBN: 978-91-7264-257-7 (tryckt)OAI: oai:DiVA.org:umu-980DiVA, id: diva2:145278
Disputas
2007-02-16, Major Groove, 6L, Molekylär Biologi, Umeå Universitet, Umeå, 13:00
Opponent
Veileder
Tilgjengelig fra: 2007-01-25 Laget: 2007-01-25 Sist oppdatert: 2011-03-24bibliografisk kontrollert
Delarbeid
1. Evolution of clonality and polyploidy in a weevil system
Åpne denne publikasjonen i ny fane eller vindu >>Evolution of clonality and polyploidy in a weevil system
2003 (engelsk)Inngår i: Molecular biology and evolution, ISSN 0737-4038, Vol. 20, nr 10, s. 1626-1632Artikkel i tidsskrift (Fagfellevurdert) Published
Identifikatorer
urn:nbn:se:umu:diva-5677 (URN)
Tilgjengelig fra: 2007-01-25 Laget: 2007-01-25 Sist oppdatert: 2018-06-09bibliografisk kontrollert
2. MLGsim: a program for detecting clones using a simulation approach
Åpne denne publikasjonen i ny fane eller vindu >>MLGsim: a program for detecting clones using a simulation approach
2003 (engelsk)Inngår i: Molecular ecology notes, ISSN 1471-8278, Vol. 3, nr 2, s. 329-331Artikkel i tidsskrift (Fagfellevurdert) Published
Identifikatorer
urn:nbn:se:umu:diva-5678 (URN)
Tilgjengelig fra: 2007-01-25 Laget: 2007-01-25 Sist oppdatert: 2018-06-09bibliografisk kontrollert
3. Polyploidization, hybridization and geographical parthenogenesis
Åpne denne publikasjonen i ny fane eller vindu >>Polyploidization, hybridization and geographical parthenogenesis
2006 Inngår i: Trends in ecology and evolution, ISSN 0169-5347, Vol. 21, nr 1, s. 9-Artikkel i tidsskrift (Fagfellevurdert) Published
Identifikatorer
urn:nbn:se:umu:diva-5679 (URN)
Tilgjengelig fra: 2007-01-25 Laget: 2007-01-25bibliografisk kontrollert
4. Asexuality alone does not explain the success of clonal forms in insects with geographical parthenogenesis
Åpne denne publikasjonen i ny fane eller vindu >>Asexuality alone does not explain the success of clonal forms in insects with geographical parthenogenesis
2006 (engelsk)Inngår i: Hereditas, ISSN 0018-0661, E-ISSN 1601-5223, Vol. 143, nr 2006, s. 23-32Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Asexual forms of invertebrates are relatively common. They are often more successful than their sexual progenitors. Especially in insects, the pattern called geographical parthenogenesis shows that asexuality is important in speciation and ecological adaptation. In geographical parthenogenesis the clones have a wider distribution than the sexual forms they originate from. This indicates that they have a broader niche they may utilize successfully. The cause of this apparent success is, however, hard to come by as the term asexuality covers separate phenomena that are hard to disentangle from the mode of reproduction itself. Asexual insects are often polyploid, of hybrid origin, or both and these phenomena have been argued to explain the distribution patterns better than clonality. In this study we survey the literature on arthropods with geographical parthenogenesis in an attempt to clarify what evidence there is for the different phenomena explaining the success of the clonal forms. We focus on the few species where knowledge of distribution of different ploidy levels allows for a distinction of contributions from different phenomena to be made. Our survey support that asexuality is not the only factor underlying the success of all asexuals. Evidence about the importance of a hybrid origin of the clones is found to be meagre as the origin of clones is unknown in the majority of cases. Asexuality, hybridity and polyploidy are intertwined phenomena that each and all may contribute to the success of clonal taxa. Polyploidy, however, emerges as the most parsimonious factor explaining the success of these asexual invertebrate taxa.

sted, utgiver, år, opplag, sider
Oxford: Blackwell, 2006
Emneord
Animals, Evolution; Molecular, Geography, Hybridization; Genetic, Insects/*genetics, Parthenogenesis, Polyploidy, Reproduction; Asexual
Identifikatorer
urn:nbn:se:umu:diva-18027 (URN)10.1111/j.2006.0018-0661.01935.x (DOI)17362330 (PubMedID)
Tilgjengelig fra: 2007-11-26 Laget: 2007-11-26 Sist oppdatert: 2018-06-09bibliografisk kontrollert
5. Otiorhynchus sulcatus, an autopolyploid general-purpose genotype species?
Åpne denne publikasjonen i ny fane eller vindu >>Otiorhynchus sulcatus, an autopolyploid general-purpose genotype species?
Artikkel i tidsskrift (Fagfellevurdert) Submitted
Identifikatorer
urn:nbn:se:umu:diva-5681 (URN)
Tilgjengelig fra: 2007-01-25 Laget: 2007-01-25bibliografisk kontrollert

Open Access i DiVA

fulltekst(1419 kB)1120 nedlastinger
Filinformasjon
Fil FULLTEXT01.pdfFilstørrelse 1419 kBChecksum MD5
f8d1134d7915459913156f86d62781004ec132a64a8958e3ae47c6ad72fb3b17c81ad484
Type fulltextMimetype application/pdf

Av organisasjonen

Søk utenfor DiVA

GoogleGoogle Scholar
Totalt: 1120 nedlastinger
Antall nedlastinger er summen av alle nedlastinger av alle fulltekster. Det kan for eksempel være tidligere versjoner som er ikke lenger tilgjengelige

isbn
urn-nbn

Altmetric

isbn
urn-nbn
Totalt: 745 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf