Browsing Naturhistorisk museum by Author "Lifjeld, Jan Terje"

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  • Complete mitochondrial genomes of eleven extinct or possibly extinct bird species 
    Anmarkrud, Jarl Andreas; Lifjeld, Jan Terje (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)
    Natural history museum collections represent a vast source of ancient and historical DNA samples from extinct taxa that can be utilized by high-throughput sequencing tools to reveal novel genetic and phylogenetic information ...
  • Deep sympatric mitochondrial divergence without reproductive isolation in the common redstart Phoenicurus phoenicurus 
    Hogner, Silje; Laskemoen, Terje; Lifjeld, Jan Terje; Porkert, Jiri; Kleven, Oddmund; Albayrak, Tamer; Kabasakal, Bekir; Johnsen, Arild (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2012)
    Mitochondrial DNA usually shows low sequence variation within and high sequence divergence among species, which makes it a useful marker for phylogenetic inference and DNA barcoding. A previous study on the common redstart ...
  • Demographic reconstruction from ancient DNA supports rapid extinction of the Great Auk 
    Thomas, Jessica E; Carvalho, Gary R.; James, Haile; Rawlence, Nicolas J.; Martin, Michael David; Ho, Simon Y.W.; Sigfússon, Arnór; Jósefsson, Vigfús A.; Frederiksen, Morten; Linnebjerg, Jannie F.; Castruita, Jose A. Samaniego; Niemann, Jonas; Sinding, Mikkel-Holger S.; Sandoval-Velasco, Marcela; Soares, André E.R.; Lacy, Robert; Barilaro, Christina; Best, Julia; Brandis, Dirk; Cavallo, Chiara; Elorza, Mikelo; Garrett, Kimball L; Groot, Maaike; Johansson, Friederike; Lifjeld, Jan Terje; Nilson, Göran; Serjeanston, Dale; Sweet, Paul; Fuller, Errol; Hufthammer, Anne Karin; Meldgaard, Morten; Fjeldså, Jon; Shapiro, Beth; Hofreiter, Michael; Gilbert, Marcus Thomas Pius; Knapp, Michael (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    The great auk was once abundant and distributed across the North Atlantic. It is now extinct, having been heavily exploited for its eggs, meat, and feathers. We investigated the impact of human hunting on its demise by ...
  • Do female bluethroats without extra-pair offspring have more MHC-compatible social mates? 
    Rekdal, Silje Larsen; Anmarkrud, Jarl Andreas; Lifjeld, Jan Terje; Johnsen, Arild (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract Genes of the major histocompatibility complex (MHC) are crucial for adaptive immunity in jawed vertebrates, and theory predicts that there should be mate choice for optimizing MHC constitution in the ...
  • Early diversification of sperm size in the evolutionary history of the old world leaf warblers (Phylloscopidae) 
    K, Supriya; Rowe, Melissah; Laskemoen, Terje; Mohan, Dhananjai; Price, Trevor; Lifjeld, Jan Terje (Journal article / Tidsskriftartikkel / SubmittedVersion, 2016)
    Sperm morphological traits are highly variable among species and are commonly thought to evolve by post-copulatory sexual selection. However, little is known about the evolutionary dynamics of sperm morphology, and whether ...
  • Effects of fixatives and storage duration on avian sperm morphology 
    Grønstøl, Gaute; Danielsen, Marie; Cramer, Becky; Johannessen, Lars Erik; Johnsen, Arild; Whittington, Emma; Lifjeld, Jan Terje (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Abstract Sperm cells are variable both within and among species. To be able to accurately measure sperm cells and understand their function, it is important that sperm cells are preserved in a manner that maintains their ...
  • Elevated phytohaemagglutinin‐induced skin‐swelling response at an intermediate number of MHC class II alleles in bluethroat nestlings 
    Rekdal, Silje Larsen; Anmarkrud, Jarl Andreas; Lifjeld, Jan Terje; Johnsen, Arild (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Genes of the major histocompatibility complex (MHC) are crucial for adaptive immunity, and theory predicts that the optimal number of alleles is intermediate rather than maximal. Support for such an intermediate optimum ...
  • Endless forms of sexual selection 
    Lindsay, Willow R.; Andersson, Staffan; Bererhi, Badreddine; Höglund, Jacob; Johnsen, Arild; Kvarnemo, Charlotta; Leder, Erica H.; Lifjeld, Jan Terje; Ninnes, Calum E.; Olsson, Mats; Parker, Geoff A.; Pizzari, Tommaso; Qvarnström, Anna; Safran, Rebecca J.; Svensson, Ola; Edwards, Scott V. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    In recent years, the field of sexual selection has exploded, with advances in theoretical and empirical research complementing each other in exciting ways. This perspective piece is the product of a “stock-taking” workshop ...
  • Experimental manipulation of sexual traits in barn swallow populations—No evidence for divergent sexual selection 
    Lifjeld, Jan Terje (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Safran et al. (2016a) manipulated two sexual traits (ventral plumage coloration and tail streamer length) in male barn swallows (Hirundo rustica) and reported divergent effects on paternity change between two study ...
  • Extra‐pair mating in a passerine bird with highly duplicated major histocompatibility complex class II: Preference for the golden mean 
    Rekdal, Silje Larsen; Anmarkrud, Jarl Andreas; Lifjeld, Jan Terje; Johnsen, Arild (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Genes of the major histocompatibility complex (MHC) are essential in vertebrate adaptive immunity, and they are highly diverse and duplicated in many lineages. While it is widely established that pathogen‐mediated selection ...
  • Flagellum tapering and midpiece volume in songbird spermatozoa 
    Cramer, Becky; Grønstøl, Gaute; Lifjeld, Jan Terje (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    In contrast to numerous studies on spermatozoa length, relatively little work focuses on the width of spermatozoa, and particularly the width of the midpiece and flagellum. In flagellated spermatozoa, the flagellum provides ...
  • Is telomere length associated with mate choice in a songbird with a high rate of extrapair paternity? 
    Johnsen, Arild; Pauliny, Angela; Lifjeld, Jan Terje; Blomqvist, Donald (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Telomere length is related to aging in many eukaryotes and the rate of telomere attrition has been suggested to reflect individual genetic quality. Telomere length could thus have implications for mate choice. We investigated ...
  • Longer Sperm Swim More Slowly in the Canary Islands Chiffchaff 
    Cramer, Emily Rebecca A; Garcia-del-Rey, Eduardo; Johannessen, Lars Erik; Laskemoen, Terje; Marthinsen, Gunnhild; Johnsen, Arild; Lifjeld, Jan Terje (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Sperm swimming performance affects male fertilization success, particularly in species with high sperm competition. Understanding how sperm morphology impacts swimming performance is therefore important. Sperm swimming ...
  • Measuring sperm swimming performance in birds: effects of dilution, suspension medium, mechanical agitation, and sperm number 
    Cramer, Emily Rebecca A; Rowe, Melissah; Eroukhmanoff, Fabrice; Lifjeld, Jan Terje; Sætre, Glenn-Peter; Johnsen, Arild (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    Sperm swimming performance, including swimming speed and the proportion of motile cells, may strongly affect fertilization success. However, little is known about how methodological factors affect in vitro measurement of ...
  • Migration distance is positively associated with sex-linked genetic diversity in passerine birds 
    Gohli, Jostein; Lifjeld, Jan Terje; Albrecht, Tomas (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2016)
    A recent comparative analysis of passerine birds found that the frequency of extra-pair paternity was positively associated with neutral genetic diversity. It has been hypothesised that migratory species have more extra-pair ...
  • No Evidence for Pre-Copulatory Sexual Selection on Sperm Length in a Passerine Bird 
    Lifjeld, Jan Terje; Laskemoen, Terje; Kleven, Oddmund; Pedersen, Anne Tiril Myhre; Lampe, Helene M.; Rudolfsen, Geir; Schmoll, Tim; Slagsvold, Tore (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2012)
    There is growing evidence that post-copulatory sexual selection, mediated by sperm competition, influences the evolution of sperm phenotypes. Evidence for pre-copulatory sexual selection effects on sperm traits, on the ...
  • Selection on sperm size in response to promiscuity and variation in female sperm storage organs 
    Cramer, Becky; Yilma, Zelealem Belaineh; Lifjeld, Jan Terje (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Sperm cells are exceptionally morphologically diverse across taxa. However, morphology can be quite uniform within species, particularly for species where females copulate with many males per reproductive bout. Strong ...
  • Signatures of diversifying selection and convergence acting on passerine Toll-like receptor 4 in an evolutionary context 
    Králová, Tereza; Albrecht, Tomas; Bryja, Josef; Horák, David; Johnsen, Arild; Lifjeld, Jan Terje; Novotny, Marian; Sedlacek, Ondrej; Velova, Hana; Vinkler, Michal (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    Positive selection acting on Toll‐like receptors (TLRs) has been recently investigated to reveal evolutionary mechanisms of host–pathogen molecular co‐adaptation. Much of this research, however, has focused mainly on the ...
  • Sperm head abnormalities are associated with excessive omega-6 fatty acids in two finch species feeding on sunflower seeds 
    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 ...
  • Sperm head abnormalities are more frequent in songbirds with more helical sperm: A possible trade-off in sperm evolution 
    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 ...