Browsing NTNU Open by Author "Hansen, Thomas F"

Now showing items 1-7 of 7

    • Artificial selection on allometry: change in elevation but not slope 

      Egset, Camilla Kalvatn; Hansen, Thomas F; Le Rouzic, Arnaud; Bolstad, Geir Hysing; Rosenqvist, Gunilla; Pelabon, Christophe (Journal article; Peer reviewed, 2012)
      To what extent within-species (static) allometries constitute a constraint on evolution is the subject of a long-standing debate in evolutionary biology. A prerequisite for the constraint hypothesis is that static allometries ...

    • Complex constraints on allometry revealed by artificial selection on the wing of Drosophila melanogaster 

      Bolstad, Geir Hysing; Cassara, Jason A.; Marquez, Eladio; Hansen, Thomas F; van der Linde, Kim; Houle, David; Pelabon, Christophe (Journal article, 2015)
      Precise exponential scaling with size is a fundamental aspect of phenotypic variation. These allometric power laws are often invariant across taxa and have long been hypothesized to reflect developmental constraints. Here ...

    • Evolution of morphological allometry 

      Pelabon, Christophe; Firmat, Cyril Joel Patrick; Bolstad, Geir Hysing; Voje, Kjetil L.; Houle, David; Cassara, Jason; Le Rouzic, Arnaud; Hansen, Thomas F (Journal article, 2014)
      Morphological allometry refers to patterns of covariance between body parts resulting from variation in body size. Whether measured during growth (ontogenetic allometry), among individuals at similar developmental stage ...

    • Measuring Complex Morphological Traits with 3D Photogrammetry: A Case Study with Deer Antlers 

      Tsuboi, Masahito; Kopperud, Bjørn Tore; Mayer, Christine; Grabowski, Mark Walter; Voje, Kjetil L.; Pelabon, Christophe; Hansen, Thomas F (Peer reviewed; Journal article, 2020)
      The increasing availability of 3D-imaging technology provides new opportunities for measuring morphology. Photogrammetry enables easy 3D-data acquisition compared to conventional methods and here we assess its accuracy for ...

    • Novel microsatellite markers for Dalechampia scandens(Euphorbiaceae) and closely related taxa:application to studying a species complex 

      Falahati-Anbaran, Mohsen; Stenøien, Hans K.; Bolstad, Geir Hysing; Hansen, Thomas F; Pérez‐Barrales, Rocio; Armbruster, William Scott; Pelabon, Christophe (Journal article; Peer reviewed, 2016)
      We developed novel microsatellite markers for D alechampia scandens L. (Euphorbiaceae). The target plants belong to a distinct, but undescribed, species in the D . scandens species complex, characterized by small resin-producing ...

    • The measure and mismeasure of reciprocity in heterostylous flowers 

      Armbruster, W. Scott; Bolstad, Geir Hysing; Hansen, Thomas F; Keller, Barbara; Conti, Elena; Pelabon, Christophe (Journal article; Peer reviewed, 2017)
      The goal of biological measurement is to capture underlying biological phenomena in numerical form. The reciprocity index applied to heterostylous flowers is meant to measure the degree of correspondence between fertile ...

    • Using ecological context to interpret spatiotemporal variation in natural selection 

      Albertsen, Elena; Opedal, Øystein Hjorthol; Bolstad, Geir Hysing; Pérez-Barrales, Rocío; Hansen, Thomas F; Pelabon, Christophe; Armbruster, William Scott (Peer reviewed; Journal article, 2020)
      Spatiotemporal variation in natural selection is expected, but difficult to estimate. Pollinator‐mediated selection on floral traits provides a good system for understanding and linking variation in selection to differences ...