6 Works

Data from: Interpreting the evolutionary regression: the interplay between observational and biological errors in phylogenetic comparative studies

Thomas F. Hansen & Krzysztof Bartoszek
Regressions of biological variables across species are rarely perfect. Usually there are residual deviations from the estimated model relationship, and such deviations commonly show a pattern of phylogenetic correlations indicating that they have biological causes. We discuss the origins and effects of phylogenetically correlated biological variation in regression studies. In particular, we discuss the interplay of biological deviations with deviations due to observational or measurement errors, which are also important in comparative studies based on...

Data from: Inferring species networks from gene trees in high-polyploid North American and Hawaiian violets (Viola, Violaceae)

Thomas Marcussen, Kjetill S. Jakobsen, Jiří Danihelka, Harvey E. Ballard, Kim Blaxland, Anne K. Brysting & Bengt Oxelman
The phylogenies of allopolyploids take the shape of networks and cannot be adequately represented as bifurcating trees. Especially for high-polyploids (i.e., organisms with more than six sets of nuclear chromosomes), the signatures of gene homoeolog loss, deep coalescence and polyploidy may become confounded, with the result that gene trees may be congruent with more than one species network. Herein, we obtained the most parsimonious species network by objective comparison of competing scenarios involving polyploidization and...

Data from: Molecular data and ploidal levels indicate several putative allopolyploidization events in the genus Potentilla (Rosaceae)

Mats Töpel, Magnus Lundberg, Torsten Eriksson & Bente Eriksen
Several naturally occurring hybrids in Potentilla (Rosaceae) have been reported, but no molecular evidence has so far been available to test these hypotheses of hybridization. We have compared a nuclear and a chloroplast gene tree to identify topological incongruences that may indicate hybridization events in the genus. Furthermore, the monophyly and phylogenetic position of the proposed segregated genera Argentina, Ivesia and Horkelia have been tested. The systematic signal from the two morphological characters, style- and...

Data from: Interpreting the evolutionary regression: the interplay between observational and biological errors in phylogenetic comparative studies

Thomas F. Hansen & Krzysztof Bartoszek
Regressions of biological variables across species are rarely perfect. Usually there are residual deviations from the estimated model relationship, and such deviations commonly show a pattern of phylogenetic correlations indicating that they have biological causes. We discuss the origins and effects of phylogenetically correlated biological variation in regression studies. In particular, we discuss the interplay of biological deviations with deviations due to observational or measurement errors, which are also important in comparative studies based on...

Data from: Molecular data and ploidal levels indicate several putative allopolyploidization events in the genus Potentilla (Rosaceae)

Mats Töpel, Magnus Lundberg, Torsten Eriksson & Bente Eriksen
Several naturally occurring hybrids in Potentilla (Rosaceae) have been reported, but no molecular evidence has so far been available to test these hypotheses of hybridization. We have compared a nuclear and a chloroplast gene tree to identify topological incongruences that may indicate hybridization events in the genus. Furthermore, the monophyly and phylogenetic position of the proposed segregated genera Argentina, Ivesia and Horkelia have been tested. The systematic signal from the two morphological characters, style- and...

Data from: Inferring species networks from gene trees in high-polyploid North American and Hawaiian violets (Viola, Violaceae)

Thomas Marcussen, Kjetill S. Jakobsen, Jiří Danihelka, Harvey E. Ballard, Kim Blaxland, Anne K. Brysting & Bengt Oxelman
The phylogenies of allopolyploids take the shape of networks and cannot be adequately represented as bifurcating trees. Especially for high-polyploids (i.e., organisms with more than six sets of nuclear chromosomes), the signatures of gene homoeolog loss, deep coalescence and polyploidy may become confounded, with the result that gene trees may be congruent with more than one species network. Herein, we obtained the most parsimonious species network by objective comparison of competing scenarios involving polyploidization and...

Registration Year

  • 2011
    6

Resource Types

  • Dataset
    6

Affiliations

  • University of Gothenburg
    6
  • University of Oslo
    4
  • Ohio University
    2
  • Masaryk University
    2
  • Chalmers University of Technology
    2
  • Stockholm University
    2
  • Swedish Museum of Natural History
    2