His primary scientific interests are in Ecology, Zoology, Demography, Ficedula and Mating. His research is interdisciplinary, bridging the disciplines of Paternal care and Ecology. Zoology is closely attributed to Genetics in his study.
His studies in Demography integrate themes in fields like Fledge, Sexual conflict and Mate guarding. His Mating study combines topics in areas such as Evolutionary biology, Inbreeding and Reproductive success. His Extra-pair copulation study combines topics from a wide range of disciplines, such as Animal ecology, Luscinia and Brood parasite.
The scientist’s investigation covers issues in Ecology, Zoology, Passerine, Sperm competition and Sperm. His study connects Demography and Ecology. The study incorporates disciplines such as Polygyny, Paternal care, Nest and Reproductive success in addition to Demography.
His research related to Extra-pair copulation, Luscinia, Plumage, Mating system and Brood might be considered part of Zoology. His Passerine course of study focuses on Evolutionary biology and Subspecies and Genetics. Jan T. Lifjeld combines subjects such as Range, Intraspecific competition and Human fertilization with his study of Sperm.
Jan T. Lifjeld mostly deals with Ecology, Sperm, Zoology, Passerine and Sperm competition. His Ecology research is multidisciplinary, relying on both Genetic diversity and Extinction. His Sperm research incorporates elements of Intraspecific competition, Songbird and Human fertilization.
Jan T. Lifjeld works in the field of Zoology, focusing on Subspecies in particular. His studies deal with areas such as Sexual selection, Innate immune system, Temperate climate and Reproductive success as well as Passerine. He has researched Sperm competition in several fields, including Allopatric speciation, Energetics, Heritability, Pyrrhula pyrrhula and Acrosome.
Jan T. Lifjeld mainly investigates Sperm, Zoology, Ecology, Sperm competition and Passerine. His work on Sperm morphology as part of general Sperm study is frequently linked to Swimming speed, therefore connecting diverse disciplines of science. His work often combines Zoology and Genomics studies.
Jan T. Lifjeld studies Ecology, focusing on Seabird in particular. The concepts of his Sperm competition study are interwoven with issues in Interspecific competition, Azores bullfinch, Heritability and Pyrrhula pyrrhula, Bullfinch. The various areas that he examines in his Passerine study include Avian clutch size, Genetics, Temperate climate, Sexual selection and Ecosystem.
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Females increase offspring heterozygosity and fitness through extra-pair matings
Katharina Foerster;Kaspar Delhey;Arild Johnsen;Jan T. Lifjeld.
Nature (2003)
Extra-pair paternity in monogamous tree swallows
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Animal Behaviour (1993)
POLYGYNY IN BIRDS: THE ROLE OF COMPETITION BETWEEN FEMALES FOR MALE PARENTAL CARE
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The American Naturalist (1994)
Female bluethroats enhance offspring immunocompetence through extra-pair copulations
Arild Johnsen;Vegard Andersen;Christine Sunding;Jan T. Lifjeld.
Nature (2000)
Variation in plumage colour of the Great tit Parus major in relation to habitat, season and food
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Journal of Zoology (1985)
Ultraviolet plumage ornamentation affects social mate choice and sperm competition in bluethroats (Aves: Luscinia s. svecica): a field experiment
Arild Johnsen;Staffan Andersson;Jonas rnborg;Jan T. Lifjeld.
Proceedings of The Royal Society B: Biological Sciences (1998)
Female control of extra-pair fertilization in tree swallows
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Behavioral Ecology and Sociobiology (1992)
DNA barcoding of Scandinavian birds reveals divergent lineages in trans-Atlantic species
Arild Johnsen;Eirik Rindal;Per G. P. Ericson;Dario Zuccon.
Journal of Ornithology (2010)
On the cost of searching for a mate in female pied flycatchers Ficedula hypoleuca
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Animal Behaviour (1988)
Carotenoids in food chain studies—II. The food chain of Parus SPP. Monitored by carotenoid analysis☆
V Partali;S Liaaen-Jensen;T Slagsvold;J.T Lifjeld.
Comparative Biochemistry and Physiology B (1987)
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