Now showing items 368-387 of 435

  • Albrecht, Tomas; Opletalová, Kamila; Reif, Jiri; Janousek, Vaclav; Pialek, Lubomir; Cramer, Emily Rebecca A; Johnsen, Arild; Reifova, Radka (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    Postcopulatory sexual selection may promote evolutionary diversification in sperm form, but the contribution of between‐species divergence in sperm morphology to the origin of reproductive isolation and speciation remains ...
  • Støstad, Hanna Nyborg; Rowe, Melissah; Johnsen, Arild; Tomasek, Oldrich; Albrecht, Tomas; Lifjeld, Jan Terje (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    In a rapidly changing world, it is important to understand how urban environments impact wildlife. For example, supplementary feeding of birds, though well‐intended, might have unexpected negative effects on the health of ...
  • Støstad, Hanna Nyborg; Rowe, Melissah; Johnsen, Arild; Lifjeld, Jan Terje (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    Sperm morphology varies enormously across the animal kingdom. Whilst knowledge of the factors that drive the evolution of interspecific variation in sperm morphology is accumulating, we currently have little understanding ...
  • Støstad, Hanna Nyborg; Johnsen, Arild; Lifjeld, Jan Terje; Rowe, Melissah (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    Sperm exhibit extraordinary levels of morphological diversification across the animal kingdom. In songbirds, sperm have a helically shaped head incorporating a distinct acrosomal membrane or “helical keel,” the form and ...
  • Omotoriogun, Taiwo Crossby; Albrecht, Tomas; Gohli, Jostein; Horák, David; Johannessen, Lars Erik; Johnsen, Arild; Kreisinger, Jakub; Marki, Petter Zahl; Ottosson, Ulf; Rowe, Melissah; Sedlacek, Ondrej; Lifjeld, Jan Terje (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Sperm cells vary tremendously in size and shape across the animal kingdom. In songbirds (Aves: Passeri), sperm have a characteristic helical form but vary considerably in size. Most of our knowledge about sperm morphology ...
  • Laskemoen, Terje (Doctoral thesis / Doktoravhandling, 2010)
    Sperm cells are the most variable animal cells, and a tremendous variation in sperm phenotypes exists among species, from minute amoeboid sperm to giant sperm in some species of fruit flies. Much effort has been devoted ...
  • Sætre, Camilla Lo Cascio; Johnsen, Arild; Stensrud, Even; Cramer, Emily Rebecca A (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Postcopulatory sexual selection may select for male primary sexual characteristics like sperm morphology and sperm motility, through sperm competition or cryptic female choice. However, how such characteristics influence ...
  • Cramer, Emily Rebecca A; Stensrud, Even; Marthinsen, Gunnhild; Hogner, Silje; Johannessen, Lars Erik; Laskemoen, Terje; Eybert, Marie-Christine; Slagsvold, Tore; Lifjeld, Jan Terje; Johnsen, Arild (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    Divergent sexual selection within allopatric populations may result in divergent sexual phenotypes, which can act as reproductive barriers between populations upon secondary contact. This hypothesis has been most tested ...
  • Omotoriogun, Taiwo Crossby; Albrecht, Tomas; Hořak, David; Laskemoen, Terje; Ottosson, Ulf; Rowe, Melissah; Sedlacek, Ondrej; Lifjeld, Jan Terje (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2016)
    Sperm morphology is highly diversified across the animal kingdom and recent comparative evidence from passerine birds suggests that postcopulatory sexual selection is a significant driver of sperm evolution. In the present ...
  • Hansen, Lars Ove; Berggren, Kai; Sørlibråten, Ove (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2010)
    The conspicuous icneumonid fly Stauropoctonus bombycivorus (Gravenhorst, 1829) is recorded for the first time in Norway. Four specimens have been captured in light-traps at three different localities in 2007: Hvaler in ...
  • Sjökvist, Elisabet; Pfeil, Bernard E.; Larsson, Ellen; Larsson, Karl-Henrik (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    One new order, one new family, and one new combination are presented, as the result of molecular phylogenetic analyses. The new order Stereopsidales and the new family Stereopsidaceae are described incorporating Stereopsis ...
  • Hansen, Bitten Bolvig; Hammer, Øyvind; Nakrem, Hans Arne (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    We report on a newly excavated Spathian (Lower Triassic) bonebed on Marmierfjellet, Central Spitsbergen. The bonebed contains a varied material of bones and teeth from marine vertebrates along with conodont elements. The ...
  • Borst, Anouk M; Finch, Adrian A.; Friis, Henrik; Horsburgh, Nicola J.; Gamaletsos, Platon N.; Goettlicher, Joerg; Steininger, Ralph; Geraki, Kalotina (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Eudialyte-group minerals (EGM) attract global interest as potential resources for high-field-strength elements (e.g. Zr, Nb, Ta, and rare-earth elements), i.e. critical materials for modern technologies. They are particularly ...
  • Mason, Matthew J.; Wenger, Lea M.D.; Hammer, Øyvind; Blix, Arnoldus S (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    In terrestrial mammals, the respiratory turbinate bones within the nasal cavity are employed to conserve heat and water. In order to investigate whether environmental temperature affects respiratory turbinate structure in ...
  • Liu, Hai-Ying (Doctoral thesis / Doktoravhandling, 2008)
    The principal aim of this study was to investigate vegetation-environment relationships and examine patterns of changes in forest understorey vegetation in five Chinese subtropical forests. Furthermore, an Ecological Field ...
  • Rowe, Melissah; Griffith, Simon C; Hofgaard, Antje; Lifjeld, Jan T (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    Background Evolutionary biology endeavours to explain biological diversity, and as such it is critical to develop an understanding of the adaptive and functional significance of trait variation. Spermatozoa ...
  • Hutchison, William; Babiel, Rainer J.; Finch, Adrian A.; Marks, Michael A. W.; Markl, Gregor; Boyce, Adrian J.; Stüeken, Eva E.; Friis, Henrik; Borst, Anouk M.; Horsburgh, Nicola J. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Earth’s surface and mantle sulphur reservoirs are connected via subduction, crustal recycling and volcanism. Although oceanic hotspot lavas currently provide the best constraints on the deep sulphur cycle, their restricted ...
  • Marki, Petter Zahl; Jønsson, Knud A.; Irestedt, Martin; Nguyen, Jacqueline M.T.; Rahbek, Carsten; Fjeldså, Jon (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)
    With nearly 300 species, the infraorder Meliphagides represents one of the largest and most conspicuous Australasian bird radiations. Although the group has been the focus of a number of recent phylogenetic studies, a ...
  • Müller, Axel; Romer, Rolf L.; Pedersen, Rolf B. (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)
    The Late-Proterozoic Sveconorwegian pegmatite province in southern Norway and southwest Sweden hosts seven rare-element pegmatite districts with more than 5000 rare-element pegmatites. Most of these pegmatites with ...