Publications Jan T. Lifjeld


211. Cramer ERA, Grønstøl G, Lifjeld JT (2022) Flagellum tapering and midpiece volume in songbird spermatozoa. Journal of Morphology 283:1577-1589. Open Access

210. Cramer ERA, Yilma ZB, Lifjeld JT (2022) Selection on sperm size in response to promiscuity and variation in female sperm storage organs. Journal of Evolutionary Biology (in press). Open Access

209. Grønstøl G, Danielsen M, Cramer ERA, Johannessen LE, Johnsen A, Whittington E, Lifjeld JT (2022) Effects of fixatives and storage duration on avian sperm morphology. Journal of Ornithology (in press). Open Access.

208. Lifjeld JT, Slagsvold T (2022) Female extra-pair copulation for direct fitness benefits: A cautionary note. Proceedings of the National Academy of Sciences 119:e2207108119. Open Access

207. Lifjeld JT, Kleven O, Fossøy F, Jacobsen F, Laskemoen T, Rudolfsen G, Robertson RJ (2022) When older males sire more offspring - increased attractiveness or higher fertility? Behavioral Ecology and Sociobiology 76:61. Open Access

206. Johannessen LE, Lifjeld JT (2022) Type specimens of birds in the Natural History  Museum, University of Oslo, Norway. Zootaxa 5150(4):451-486. Abstract

205. Rowe M, van Oort A, Brouwer L, Lifjeld JT, Webster MS, Welklin JF, Baldassarre DT (2022) Sperm numbers as a paternity guard in a wild bird. Cells 11:231. Open Access

204. Lifjeld JT (2022) Experimental manipulation of sexual traits in barn swallow populations - No evidence for divergent sexual selection. Evolution 76:2199-2203. Open Access.

203. Cramer ERA, Grønstøl G, Maxwell L, Kovach AI, Lifjeld JT (2021) Sperm length divergence as a potential pre-zygotic barrier in a passerine hybrid zone. Ecology and Evolution 11:9489-9497. Open Access

202. Cramer ERA, Garcia-del-Rey E, Johannessen LE, Laskemoen T, Marthinsen GM, Johnsen A, Lifjeld JT (2021) Longer sperm swim more slowly in the Canary Islands chiffchaff. Cells 10:1358. Open Access

201. Rekdal S, Anmarkrud JA, Lifjeld JT, Johnsen A (2021) Elevated phytohaemagglutinin-induced skin-swelling response at an intermediate number of MHC class II alleles in bluethroat nestlings. Journal of Avian Biology 52:e02734. Open Access

200. Bodawatta K, Synek P, Bos N, Garcia-del-Rey E, Koane B, Marki PZ, Albrecht T, Lifjeld JT, Poulsen M, Munclinger P, Sam K, Jønsson K (2020) Spatiotemporal patterns of avian host-parasite interactions in the face of biogeographical range expansions. Molecular Ecology 29:2431-2448. Abstract

199. Omotoriogun TC, Albrecht T, Gohli J, Hořák D, Johannessen LE, Johnsen A, Kreisinger J, Marki PZ, Ottosson U, Rowe M, Sedláček O, Lifjeld JT (2020) Sperm length variation among Afrotropical songbirds reflects phylogeny rather than adaptations to the tropical environment. Zoology 140:125770. Open Access

198. Thomas JE, Carvalho GR, Haile J, Rawlence NJ, Martin MD, Ho SYW, Sigfússon A, Jósefsson VA, Frederiksen M, Linnebjerg JF, Samaniego Castruita JA, Niemann J, Sinding M-HS, Sandoval-Velasco M, Soares AER, Lacy RC, Barilaro C, Best J, Brandis D, Cavallo C, Elorza M, Garrett KL, Groot M, Johansson F, Lifjeld JT, Nilson G, Serjeanston D, Sweet P, Fuller E, Hufthammer AK, Meldgaard M, Fjeldså J, Shapiro B, Hofreiter M, Stewart JR, Gilbert MTP, Knapp M (2019) Demographic reconstruction from ancient DNA supports rapid extinction of the Great Auk. eLIFE 9:e47509. Open Access

197. Lindsay WR, Andersson S, Bererhi B, Höglund J, Johnsen A, Kvarnemo C, Leder EH, Lifjeld JT, Ninnes CE, Olsson M, Parker GA, Pizzari T, Qvarnström A, Safran RJ, Svensson O, Edwards S (2019) Endless forms of sexual selection. PeerJ 7:e7988. Open Access

196. Rekdal SL, Anmarkrud JA, Lifjeld JT, Johnsen A (2019) Extra-pair mating in a passerine bird with highly duplicated MHC class II: Preference for the golden mean. Molecular Ecology 28:1533-1544. Open Access

195. Lifjeld JT, Gohli J, Albrecht T, Garcia-del-Rey E, Johannessen LE, Kleven O, Marki PZ, Omotoriogun TC, Rowe M, Johnsen A (2019) Evolution of female promiscuity in Passerides songbirds. BMC Evolutionary Biology 19:169. Open Access

194. Lifjeld JT (2019) The avian sperm collection in the Natural History Museum, University of Oslo. Alauda 87: 93-101. pdf

193. Cramer ERA, Rowe M, Eroukhmanoff F, Lifjeld JT, Sætre G-P, Johnsen A (2019) Measuring sperm swimming performance in birds: effects of dilution, suspension medium, mechanical agitation, and sperm number. Journal of Ornithology 160:1053-1063. Abstract

192. Støstad HN, Rowe M, Johnsen A, Lifjeld JT (2019) Sperm head abnormalities are more frequent in songbirds with more helical sperm. Journal of Evolutionary Biology 32: 666-674. Abstract

191. Støstad HN, Rowe M, Johnsen A, Tomášek O, Albrecht T, Lifjeld JT (2019) Sperm head abnormalities are associated with excessive omega-6 fatty acids in two finch species feeding on sunflower seeds. Journal of Avian Biology 50: e02056. Abstract

190. Støstad HN, Johnsen A, Lifjeld JT, Rowe M (2018) Sperm head morphology is associated with sperm swimming speed: A comparative study of songbirds using electron microscopy. Evolution 72: 1918-1932. Abstract

189. Králová T, Albrecht T, Bryja J, Hořák D, Johnsen A, Lifjeld JT, Novotný M, Sedláček O, Velová H, Vinkler M (2018) Signatures of diversifying selection and convergence acting on passerine Toll-like receptor 4 in an evolutionary context. Molecular Ecology 27:2871-2883. Abstract

188. Rekdal SL, Anmarkrud JA, Johnsen A, Lifjeld JT (2018) Genotyping strategy matters when analyzing hypervariable MHC - Experience from a passerine bird. Ecology and Evolution 8:1680-1692. Open Access.

187. Johnsen A, Pauliny A, Lifjeld JT, Blomqvist D (2017) Is telomere length associated with mate choice in a songbird with a high rate of extra-pair paternity? PLoS ONE 12(8): e0182446. Open Access.

186. Anmarkrud JA, Lifjeld JT (2017) Complete mitochondrial genomes of eleven extinct or possibly extinct bird species. Molecular Ecology Resources 17: 334-341. Abstract

185. Lifjeld JT, Anmarkrud JA, Calabuig P, Cooper JEJ, Johannessen LE, Johnsen A, Kearns AM, Lachlan RF, Laskemoen T, Marthinsen G, Stensrud E, Garcia-del-Rey E (2016) Species-level divergences in multiple functional traits between the two endemic subspecies of Blue Chaffinches Fringilla teydea in Canary Islands. BMC Zoology 1: 4. Open Access.

184. Støstad HN, Rekdal SL, Kleven O, Laskemoen T, Marthinsen G, Johnsen A, Lifjeld JT (2016) Weak geographical structure in sperm morphology across the range of two willow warbler Phylloscopus trochilus subspecies in Scandinavia. Journal of Avian Biology 47: 731-741. Abstract

183. Supriya K, Rowe M, Laskemoen T, Mohan D, Price TD, Lifjeld JT (2016) Early diversification of sperm size in the evolutionary history of old world leaf warblers (Phylloscopidae). Journal of Evolutionary Biology 29: 777-789. Abstract

182. Cramer ERA, Stensrud E, Marthinsen G, Hogner S, Johannessen LE, Laskemoen T, Eybert MC, Slagsvold T, Lifjeld JT, Johnsen A (2016) Sperm performance in conspecific and heterospecific female fluid. Ecology and Evolution 6: 1363-1377. Open Access.

181. Omotoriogun, TC, Laskemoen T, Rowe M, Albrecht T, Bowie RCK, Sedlacek O, Horak D, Ottosson U, Lifjeld JT (2016) Variation in sperm morphology among Afrotropical sunbirds. Ibis 158: 155-166. Abstract

180. Omotoriogun TC, Albrecht T, Horak D, Laskemoen T, Ottosson U, Rowe M, Sedlacek O, Lifjeld JT (2016) Sperm size evolution in African greenbuls (Passeriformes: Pycnonotidae). Biological Journal of the Linnean Society 117: 337-349. Abstract

179. Gohli J, Lifjeld JT, Albrecht T (2016) Migration distance is positively associated with sex-linked genetic diversity in passerine birds. Ethology Ecology & Evolution 28: 42-52. Abstract

178. Lifjeld JT (2015) When taxonomy meets genomics: lessons from a common songbird. Molecular Ecology 24: 2901-2903. Abstract

177. Dale S, Lifjeld JT, Rowe M (2015) Commonness and ecology, but not bigger brains, predict urban living in birds. BMC Ecology 15:12. Open access.

176. Rowe M, Albrecht T, Cramer ERA, Johnsen A, Laskemoen T, Weir JT, Lifjeld JT (2015) Postcopulatory sexual selection is associated with accelerated evolution of sperm morphology. Evolution 69: 1044-1052. Abstract

175. Hogner S, Riera AB, Wold M, Lifjeld JT, Johnsen A (2015) Intergeneric hybridization between Common Redstart Phoenicurus phoenicurus and Whinchat Saxicola rubetra revealed by molecular analyses. Journal of Ornithology 156: 829-836. Abstract

174. Gohli J, Leder EH, Garcia-del-Rey E, Johannessen LE, Johnsen A, Laskemoen T, Popp M, Lifjeld JT (2015) The evolutionary history of Afrocanarian blue tits inferred from genome-wide SNPs. Molecular Ecology 24: 180-191. Abstract

173. Cramer ERA, Laskemoen T, Stensrud E, Rowe M, Haas F, Lifjeld JT, Sætre GP, Johnsen A  (2015) Morphology-function relationships and repeatability in the sperm of Passer sparrows. Journal of Morphology 276: 370-377. Abstract

172. Rowe M, Griffith SC, Hofgaard A, Lifjeld JT (2015) Subspecific variation in sperm morphology and performance in the Long-tailed Finch (Poephila acuticauda). Avian Research 6:23. Open Access

171.  Svoboda A, Marthinsen G, Pavel V, Chutny B, Turčoková L, Lifjeld JT, Johnsen A (2015) Blood parasite prevalence in the Bluethroat is associated with subspecies and breeding habitat. Journal of Ornithology 156: 371-380. Abstract 

170. Larson KW, Liedvogel M, Addison B, Kleven O, Laskemoen T, Lifjeld JT, Lundberg M, Åkesson S, Bensch S (2014) Allelic variation in a willow warbler genomic region is associated with climate clines. PLoS ONE 9(5): e95252. Open Access

169. Cramer, E.R.A., Laskemoen, T., Eroukhmanoff, F., Haas, F., Hermansen, J.S., Lifjeld, J.T., Rowe, M., Sætre, G.-P., Johnsen, A. 2014. Testing a post-copulatory pre-zygotic barrier in a passerine species pair. Behavioral Ecology and Sociobiology 68: 1133-1144. Abstract

168. Wojczulanis-Jakubas, K., Kilikowska, A.,Harding, A.M.A., Jakubas, D., Karnovsky, N.J., Steen, H., Strøm, H., Welcker, J., Gavrilo, M., Lifjeld, J.T., Johnsen, A. 2014. Weak population genetic differentiation in the most numerous Arctic seabird, the little auk. Polar Biology 37: 621-630. Open Access

167. Hermosell, I.G., Laskemoen, T., Rowe, M., Møller, A.P., Mousseau, T.A., Albrecht, T., Lifjeld, J.T. 2013. Patterns of sperm damage in Chernobyl passerine birds suggest a trade-off between sperm length and integrity. Biology Letters 9: 20130530. Abstract

166. Lifjeld, J.T., Gohli, J., Johnsen, A. 2013. Promiscuity, sexual selection and genetic diversity: a reply to Spurgin. Evolution 67: 3073-3074. Abstract

165. Cramer, E.R.A., Laskemoen, T., Kleven, O., LaBarbera, K., Lovette, I.J., Lifjeld, J.T. 2013. No evidence that sperm morphology predicts paternity success in wild house wrens.  Behavioral Ecology and Sociobiology 67: 1845-1853. Abstract

164. Hogner, S., Laskemoen, T., Lifjeld, J.T., Pavel, V., Chutny, B., Garcia, J., Eybert, M.C., Matsyna, E., Johnsen, A. 2013. Rapid sperm evolution in the bluethroat (Luscinia svecica) subspecies complex. Behavioral Ecology and Sociobiology 67: 1205-1217. Abstract

163. Laskemoen, T., Kleven, O., Johannessen, L.E., Fossøy, F., Robertson, R.J., Lifjeld, J.T. 2013. Repeatability of sperm size and motility within and between seasons in Barn Swallows Hirundo rustica. Journal of Ornithology 154: 955-963. Abstract

162. Garcia-del-Rey, E., Marthinsen, G., Calabuig, P., Estévez, L., Johannessen, L. E., Johnsen, A., Laskemoen, T., Lifjeld, J.T. 2013. Reduced genetic diversity and sperm motility in the endangered Gran Canaria Blue Chaffinch Fringilla teydea polatzeki. Journal of Ornithology 154: 761-768. Abstract

161. Rowe, M., Czirják, G.A., Lifjeld, J.T., Giraudeau, M. 2013. Lysozyme-associated bactericidal activity in the ejaculate of a wild passerine. Biological Journal of the Linnean Society 109: 92-100. Abstract.

160. Gohli, J., Anmarkrud, J.A., Johnsen, A., Kleven, O., Borge, T., Lifjeld, J.T. 2013. Female promiscuity is positively associated with neutral and selected genetic diversity in passerine birds. Evolution 67: 1406-1419. Abstract

159. Omotoriogun, T.C., Temidayo, O., Adeyanju, T.A., Ottosson, U., Lifjeld, J.T. 2013. First photographs of Grey Ground Thrush Zoothera princei for Nigeria, from Omo Forest Reserve. Bulletin of the African Bird Club 20: 208-209.

158. Rowe, M., Laskemoen, T., Johnsen, A., Lifjeld, J.T. 2013. Evolution of sperm structure and energetics in passerine birds. Proceedings of the Royal Society of London Series B 280: 20122616. Abstract

157. Albrecht, T., Kleven, O., Kreisinger, J., Laskemoen, T., Omotoriogun, T.C., Ottosson, U., Reif, J., Sedlacek, O., Horak, D., Robertson, R.J., Lifjeld, J.T. 2013. Sperm competition in tropical versus temperate zone birds. Proceedings of the Royal Society of London Series B 280: 20122434. Abstract

156. Laskemoen, T., Albrecht, T., Bonisoli-Alquati, A., Cepak, J., de Lope, F., Hermosell, I.G., Johannessen, L.E., Kleven, O., Marzal, A., Mousseau, T.A., Møller, A.P., Robertson, R.J., Rudolfsen, G., Saino, N., Vortman, Y., Lifjeld, J.T. 2013. Variation in sperm morphometry and sperm competition among barn swallow (Hirundo rustica) populations. Behavioral Ecology and Sociobiology 67: 301-309. Abstract

155. Kvie, K.S., Hogner, S., Aarvik, L., Lifjeld, J.T., Johnsen, A. 2013. Deep sympatric mtDNA divergence in the autumnal moth (Epirrita autumnata). Ecology and Evolution 3:126-144. Open Access

154. Lifjeld, J.T., Hoenen, A., Johannessen, L.E., Laskemoen, T., Lopes, R.J., Rodrigues, P., Rowe, M. 2013. The Azores bullfinch (Pyrrhula murina) has the same unusual and size-variable sperm morphology as the Eurasian bullfinch (Pyrrhula pyrrhula). Biological Journal of the Linnean Society 108: 677-687. Abstract

153. Cramer, E.R.A., Laskemoen, T., Kleven, O., Lifjeld, J.T. 2013. Sperm length variation in House Wrens Troglodytes aedon. Journal of Ornithology 154: 129-138. Abstract

152. Øigarden, T., Lifjeld, J.T. 2013. Primary sex ratios vary with clutch size in the size-dimorphic White-throated Dipper Cinclus cinclus. Journal of Ornithology 154: 91-97. Abstract

151. Hogner, S., Laskemoen, T., Lifjeld, J.T., Porkert, J., Kleven, O., Albayrak, T., Kabasakal, B., Johnsen, A. 2012. Deep sympatric mitochondrial divergence without reproductive isolation in the common redstart Phoenicurus phoenicurus. Ecology and Evolution 2: 2974-2988. Open Access.

150. Omotoriogun, T.C., Temidayo, O., Adeyanju, T.A., Ottosson, U. & Lifjeld, J.T. 2012. First record and probable breeding of African Pitta Pitta angolensis in Omo Forest Reserve, southwest Nigeria. Malimbus 34: 122-124.

149. Garcia-del-Rey, E., Kleven, O., Lifjeld, J.T. 2012. Extrapair paternity in insular African Blue Tits Cyanistes teneriffae is no less frequent than in continental Eurasian Blue Tits Cyanistes caeruleus. Ibis 154: 862-867. Abstract

148. Lifjeld, J.T., Laskemoen, T., Kleven, O., Pedersen, A.T.M., Lampe, H.M., Rudolfsen, G., Schmoll, T., Slagsvold, T. 2012. No evidence for pre-copulatory sexual selection on sperm length in a passerine bird. PLoS ONE 7(2): e32611. Open access.

147. Johnsen, A., Carter, K.L., Delhey, K., Lifjeld, J.T., R.J., Robertson, R.J., Kempenaers, B. 2012. Laying-order effects on sperm numbers and on paternity: comparing three passerine birds with different life histories. Behavioral Ecology and Sociobiology 66: 181-190. Abstract

146. Lifjeld, J.T., Kleven, O., Jacobsen, F., McGraw, K.J., Safran, R.J., Robertson, R.J. 2011. Age before beauty? Relationships between fertilization success and age-dependent ornaments in barn swallows. Behavioral Ecology and Sociobiology 65: 1687-1697. Open Access.

145. Johannessen L.E., Ke, D., Lu, X., Lifjeld, J.T. 2011. Geographical variation in patterns of parentage and relatedness in the co-operatively breeding Ground Tit Parus humilis. Ibis 153: 373-383. Abstract

144. Anmarkrud, J.A., Kleven, O., Augustin, J., Bentz, K.H., Blomqvist, D., Fernie, K.J., Magrath, M.J.L., Pärn, H., Quinn, J.S., Robertson, R.J., Szép, T., Tarof, S., Wagner, R.H., Lifjeld, J.T. 2011. Factors affecting germline mutations in a hypervariable microsatellite: a comparative analysis of six species of swallows (Aves: Hirundinidae). Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis 708: 37-43. Abstract

143. Lifjeld, J.T., Laskemoen, T., Kleven, O., Albrecht, T., Robertson, R.J. 2010. Sperm length variation as a predictor of extrapair paternity in passerine birds. PLoS ONE 5 (10): e13456. Open Access.

142. Laskemoen, T., Kleven, O., Fossøy, F., Robertson, R.J., Rudolfsen, G., Lifjeld, J.T. 2010. Sperm quantity and quality effects on fertilization success in a highly promiscuous passerine, the tree swallow Tachycineta bicolor. Behavioral Ecology and Sociobiology 64: 1473-1483. Abstract

141. Anmarkrud, J.A., Johnsen, A., Bachmann, L., Lifjeld, J.T. 2010. Ancestral polymorphism in exon 2 of bluethroat (Luscinia svecica) MHC class II B genes. Journal of Evolutionary Biology 23: 1206-1217. Abstract

140. Johnsen, A., Rindal, E., Ericson, P.G.P., Zuccon, D., Kerr, K.C.R., Stoeckle, M.Y., Lifjeld, J.T. 2010. DNA barcoding of Scandinavian birds reveals divergent lineages in trans-Atlantic species. Journal of Ornithology 151: 565-578. Open Access

139. Van den Steen, E., Pinxten, R., Covaci, A., Carere, C., Eeva, T., Heeb, P., Kempenaers, B., Lifjeld, J.T., Massa, B., Norte, A.C., Orell, M., Sanz, J.J., Senar, J.C., Sorace, A., Török, J., Eens, M. 2010. The use of blue tit eggs as a biomonitoring tool of organohalogenated pollutants in the European environment. Science of the Total Environmen 408: 1451-1457. Abstract

138. Pierce, E.P., Oring, L.W., Røskaft, E., Lifjeld, J.T. 2010. Why don't female purple sandpipers perform brood care? A removal experiment. Behavioral Ecology 21: 275-283. Abstract

137. Lifjeld, J.T., Marthinsen, G., Myklebust, M., Dawson, D.A., Johnsen, A. 2010. A wild Marsh Warbler x Sedge Warbler hybrid (Acrocephalus palustris x A. schoenobaenus) in Norway documented with molecular markers. Journal of Ornithology 151: 513-517. Abstract

136. Øigarden, T., Borge, T., Lifjeld, J.T. 2010. Extrapair paternity and genetic diversity: the white-throated dipper Cinclus cinclus. Journal of Avian Biology 41: 248-257. Abstract

135. Anker-Nilssen, T., Kleven, O., Aarvak, T., Lifjeld, J.T. 2010. Low or no occurrence of extra-pair paternity in the Black Guillemot Cepphus grylle. Journal of Ornithology 151: 247-250. Abstract

134. Svoboda, A., Marthinsen, G., Turcokova, L., Lifjeld, J.T., Johnsen, A. 2009. Identification of blood parasites in Old World warbler species from the Danube river delta. Avian Diseases 53: 634-636. Abstract

133. Fossøy, F., Johnsen, A., Lifjeld, J.T. 2009. Cell-mediated immunity and multi-locus heterozygosity in bluethroat nestlings. Journal of Evolutionary Biology 22: 1954-1960. Abstract

132. Kleven, O., Fossøy, F., Laskemoen, T., Robertson, R.J., Rudolfsen, G., Lifjeld, J.T. 2009. Comparative evidence for the evolution of sperm swimming speed by sperm competition and female sperm storage duration in passerine birds. Evolution 63: 2466-2473. Abstract

131. Marthinsen, G., Wennerberg, L., Solheim, R., Lifjeld, J.T. 2009. No phylogeographic structure in the circumpolar snowy owl (Bubo scandiacus). Conservation Genetics 10: 923-933. Abstract

130. Kleven, O., Laskemoen, T., Lifjeld, J.T. 2009. Sperm length in sand martins: a comment on Helfenstein et al. Journal of Avian Biology 40: 241-242. Abstract

129. Dunn, P.O., Lifjeld, J.T., Whittingham, L.A. 2009. Multiple paternity and offspring quality in tree swallows. Behavioral Ecology and Sociobiology 63: 911-922. Abstract

128. Wojczulanis-Jakubas, K., Jakubas, D., Øigarden, T., Lifjeld, J.T. 2009. Extrapair copulations are frequent but unsuccessful in a highly colonial seabird, the little auk Alle alle. Animal Behaviour 77: 433-438. Abstract

127. Van den Steen, E., Pinxten, R., Jaspers, V.L.B., Covaci, A., Barba, E., Carere, C., Cichon, M., Dubiec, A., Eeva, T., Heeb, P., Kempenaers, B., Lifjeld, J.T., Lubjuhn, T., Mänd, R., Massa, B., Nilsson, J.-Å., Norte, A.C., Orell, M., Podzemny, P., Sanz, J.J., Senar, J.C., Soler, J.J., Sorace, A., Török, J., Visser, M.E., Winkel, W., Eens, M. 2009. Brominated flame retardants and organochlorines in the European environment using great tit eggs as a biomonitoring tool. Environment International 35: 310-317. Abstract

126. Crowe, S.A., Kleven, O., Delmore, K.E., Laskemoen, T., Nocera, J.J., Lifjeld, J.T., Robertson, R.J. 2009. Paternity assurance through frequent copulations in a wild passerine with intense sperm competition. Animal Behaviour 77: 183-187. Abstract

125. Lislevand, T., Marthinsen, G., Lifjeld, J.T. 2009. Sex differences in body size and body condition in breeding Temminck's stints Calidris temminckii. Journal of Ornithology 150: 299-302. Abstract

124. Delmore, K., Kleven, O., Laskemoen, T., Crowe, S., Lifjeld, J.T., Robertson, R.J. 2008. Sex allocation and parental quality in tree swallows. Behavioral Ecology 19: 1243-1249. Abstract

123. Marthinsen, G., Wennerberg, L., Pierce, E.P., Lifjeld, J.T. 2008. Phylogeographic origin and genetic diversity of dunlin Calidris alpina in Svalbard. Polar Biology 31:1409-1420. Abstract

122. Kleven, O., Bjerke, B.-A., Lifjeld, J.T. 2008. Genetic monogamy in the common crossbill (Loxia curvirostra). Journal of Ornithology 149: 651-654. Abstract

121. Johnsen, A., Pärn, H., Fossøy, F., Kleven, O., Laskemoen, T., Lifjeld, J.T. 2008. Is female promiscuity constrained by the presence of her social mate? An experiment with bluethroats Luscinia svecica. Behavioral Ecology and Sociobiology 62: 1761-1767. Abstract

120. Wennerberg, L., Marthinsen, G., Lifjeld, J.T. 2008. Conservation genetics and phylogeography of Southern dunlins Calidris alpina schinzii. Journal of Avian Biology 39: 423-437. Abstract

119. Anker-Nilssen, T., Kleven, O., Aarvak, T., Lifjeld, J.T. 2008. No evidence of extra-pair paternity in the Atlantic Puffin Fratercula arctica. Ibis 150: 619-622. Abstract

118. Harding, A.M.A., Hobson, K.A., Walkusz, W., Dmoch, K., Karnovsky, N.J., Van Pelt, T.I., Lifjeld, J.T. 2008. Can stable isotope (δ13C and δ15N) measurements of little auk ( Alle alle ) adults and chicks be used to track changes in high-Arctic marine foodwebs? Polar Biology 31: 725-733. Abstract

117. Marthinsen, G., Wennerberg, L., Lifjeld, J.T. 2008. Low support for separate species within the redpoll complex (Carduelis flammea - hornemanni- cabaret) from analyses of mtDNA and microsatellite markers. Molecular Phylogenetics and Evolution 47: 1005-1017. Abstract

116. Anmarkrud, J.A., Kleven, O., Bachmann, L., Lifjeld, J.T. 2008. Microsatellite evolution: Mutations, sequence variation, and homoplasy in the hypervariable avian microsatellite locus HrU10. BMC Evolutionary Biology 8: 138. Abstract

115. Laskemoen, T., Fossøy, F., Rudolfsen, G., Lifjeld, J.T. 2008. Age-related variation in primary sexual characters in a species with male age-related fertilization success, the bluethroat Luscinia svecica. Journal of Avian Biology 39: 322-328. Abstract

114. Jacobsen, F., Nesje, M., Bachmann, L., Lifjeld, J.T. 2008. Significant genetic admixture after reintroduction of peregrine falcon (Falco peregrinus) in southern Scandinavia. Conservation Genetics 9: 581-591. Abstract

113. Akbari, A., Marthinsen, G., Lifjeld, J.T., Albregtsen, F., Wennerberg, L., Stenseth, N.C., Jakobsen, K.S. 2008. Improved DNA length estimation in capillary electrophoresis. Electrophoresis 29: 1273-1285. Abstract

112. Kleven, O., Laskemoen, T., Fossøy, F., Robertson, R.J., Lifjeld, J.T. 2008. Intraspecific variation in sperm length is negatively related to sperm competition in passerine birds. Evolution 62: 494-499. Abstract

111. Fossøy, F., Johnsen, A., Lifjeld, J.T. 2008. Multiple genetic benefits of female promiscuity in a socially monogamous passerine. Evolution 62: 145-156. Abstract

110. Marthinsen, G.M., Wennerberg, L., Lifjeld, J.T. 2007. Phylogeography and subspecies taxonomy of dunlins (Calidris alpina) in western Palearctic analysed by DNA microsatellites and amplified fragment length polymorphism markers. Biological Journal of the Linnean Society 92: 713-726. Abstract

109. Laskemoen, T., Kleven, O., Fossøy, F., Lifjeld, J.T. 2007. Intraspecific variation in sperm length in two passerine species, the Bluethroat Luscinia svecica and the Willow Warbler Phylloscopus trochilus. Ornis Fennica 84:131-139. pdf

108. Whittingham, L.A., Dunn, P.O., Lifjeld, J.T. 2007. Egg mass influences nestling quality in tree swallows, but there is no differential allocation in relation to laying order or sex. Condor 109: 585-594. Abstract

107. Kleven, O., Øigarden, T., Foyn, B.E., Moksnes, A., Røskaft, E., Rudolfsen, G., Stokke, B.G., Lifjeld, J.T. 2007. Low frequency of extrapair paternity in the common redstart (Phoenicurus phoenicurus). Journal of Ornithology 148: 373-378. Abstract

106. Stapleton, M.K., Kleven, O., Lifjeld, J.T., Robertson, R.J. 2007. Female tree swallows (Tachycineta bicolor) increase offspring heterozygosity through extrapair mating. Behavioral Ecology and Sociobiology 61: 1725-1733. Abstract

105. Lifjeld, J.T., Laskemoen, T., Fossøy, F., Johnsen, A., Kleven, O. 2007. Functional infertility among territorial males in two passerine species, the willow warbler Phylloscopus trochilus and the bluethroat Luscinia svecica. Journal of Avian Biology 38: 267-272. Abstract

104. Johnsen, A. and Lifjeld, J.T. 2006. Do weather conditions affect the frequency of extra-pair paternity in the bluethroat (Luscinia s. svecica)? Proceedings of the 23 International Ornithological Congress, Beijing. Acta Zoologica Sinica 52 (Supplement): 232-234.

103. Johnsen, A., Andersson, S., Fernandez, J.G., Kempenaers, B., Pavel, V., Questiau, S., Raess, M., Rindal, E. & Lifjeld, J.T. 2006. Molecular and phenotypic divergence in the bluethroat (Luscinia svecica) subspecies complex. Molecular Ecology 15(13): 4033-4047.

102. Fossøy, F., Johnsen, A. & Lifjeld, J.T. 2006. Evidence of obligate female promiscuity in a sociallymonogamous passerine. Behavioral Ecology and Sociobiology 60: 255-259.

101. Kleven, O., Marthinsen, G.M. & Lifjeld, J.T. 2006. Male extraterritorial forays, age and paternity in the socially monogamous reed bunting (Emberiza schoeniclus). Journal of Ornithology 147: 468-473.

100. Kleven, O., Jacobsen, F., Izadnegahdar, R., Robertson, R.J. & Lifjeld, J.T. 2006. No evidence of paternal genetic contribution to nestling cell-mediated immunity in the North American barn swallow. Animal Behaviour 71:839-845.

99. Kleven, O., Jacobsen, F., Izadnegahdar, R., Robertson, R.J. & Lifjeld, J.T. 2006. Male tail streamer length predicts fertilization success in the North American barn swallow (Hirundo rustica erythrogaster). Behavioral Ecology and Sociobiology 59, 412-418.

98. Kleven, O., Jacobsen, F., Robertson, R.J. & Lifjeld, J.T. 2005. Extrapair mating between relatives in the barn swallow: a role for kin selection? Biology Letters 1: 389-392.

97. Pärn, H., Lifjeld, J.T. & Amundsen, T. 2005. Female throat ornamentation does not reflect cell-mediated immune response in bluethroats Luscinia s. svecica. Oecologia 146: 496-504.

96. Lifjeld, J.T., Harding, A.M.A., Mehlum, F. & Øigarden, T. 2005. No evidence of extra-pair paternity in the little auk Alle alle. Journal of Avian Biology 36: 484-487.

95. Johannessen, L.E., Slagsvold, T., Hansen, B.T. & Lifjeld, J.T. 2005. Manipulation of male quality in wild tits: effects on paternity loss. Behavioral Ecology 16: 747-754.

94. Lifjeld, J.T., Johnsen, A. & Petitguyot, T. 2005. Egg-size variation in the Bluethroat (Luscinia s. svecica): constraints and adaptation. Journal of Ornithology 146: 249-256.

93. Marthinsen, G.M., Kleven, O., Brenna, E. & Lifjeld, J.T. 2005. Part-time mate guarding affects paternity in male reed buntings (Emberiza schoeniclus). Ethology 111: 397-409.

92. Kleven, O. & Lifjeld, J.T. 2005. No evidence for increased offspring heterozygosity by extra-pair mating in the reed bunting. Behavioral Ecology 16: 561-565.

91. Harding, A., Van Pelt, T.I., Lifjeld, J.T. & Mehlum, F. 2004. Sex differences in Little Auk (Alle alle) parental care: transition from biparental to paternal-only care. Ibis 146: 642-651.

90. Kleven, O. & Lifjeld, J.T. 2004. Extra-pair paternity and offspring immunocompetence in the reed bunting (Emberiza schoeniclus). Animal Behaviour 68: 283-289.

89. Foerster, K., Delhey, K., Johnsen, A., Lifjeld, J.T. & Kempenaers, B. 2003. Females increase offspring heterozygosity and fitness through extra-pair matings. Nature 425: 714-717.

88. Johnsen, A. & Lifjeld, J.T. 2003. Ecological constraints on extra-pair paternity in the bluethroat. Oecologia 136: 476-483.

87. Johnsen, A., Lifjeld, J.T. & Krokene, C. 2003. Age-related variation in mate-guarding intensity in the bluethroat (Luscinia s. svecica). Ethology 109: 147-158.

86. Ottvall, R., Bensch, S., Walinder, G. & Lifjeld, J.T. 2002. No evidence of genetic differentiation among lesser redpolls Carduelis flammea cabaret and common redpolls Carduelis f. flammea. Avian Science 2: 237-244.

85. Dale, S., Slagsvold, T., Lampe, H.M. & Lifjeld, J.T. 2002. Age-related changes in morphological characters in the pied flycatcher Ficedula hypoleuca. Avian Science 2: 153-166.

84. Slagsvold, T., Hansen, B.T., Johannessen, L.E. & Lifjeld, J.T. 2002. Mate choice and imprinting in birds studied by cross-fostering in the wild. Proceedings of the Royal Society of London Series B 269: 1449-1455.

83. Lifjeld, J.T., Bjørnstad, G., Frydenlund Steen, O. & Nesje, M. 2002. Reduced genetic variation in Norwegian Peregrine Falcons (Falco peregrinus) indicated by DNA fingerprinting. Ibis 144: E19-E26.

82. Lifjeld, J.T., Dunn, P.O. & Whittingham, L.A. 2002. Short-term fluctuations in cellular immunity of tree swallows feeding nestlings. Oecologia 130: 185-190.

81. Johnsen, A., Lifjeld, J.T., Andersson, S., Örnborg, J. & Amundsen, T. 2001. Male characteristics and fertilisation success in bluethroats. Behaviour 138: 1371-1390.

80. Wallander, J., Blomqvist, D. & Lifjeld, J.T. 2001. Genetic and social monogamy - does it occur without male mate guarding in the ringed plover Charadrius hiaticula? Ethology 107:

79. Slagsvold, T., Johnsen, A., Lampe, H.M. & Lifjeld, J.T. 2001. Do female pied flycatchers seek extra-pair copulations with familiar males? A test of the incomplete knowledge hypothesis. Behavioral Ecology 12: 412-418.

78. Birkhead, T. R., Hatchwell, B. J., Lindner, R., Blomqvist, D., Pellatt, E. J., Griffith, R. & Lifjeld, J. T. 2001. Extra-pair paternity in the Common Murre. Condor 103: 158-162.

77. Nesje, M., Røed, K.H., Bell, D.A., Lindberg, P. & Lifjeld, J.T. 2000. Microsatellite analysis of population structure and genetic variability in peregrine falcons (Falco peregrinus). Animal Conservation 3: 267-275.

76. Lorentsen, S.-H., Amundsen, T., Anthonisen, K. & Lifjeld, J.T. 2000. Molecular evidence for extrapair paternity and female-female pairs in a socially monogamous colonial seabird, the Antarctic petrel. Auk 117: 1042-1047.

75. Krokene, C. & Lifjeld, J.T. 2000. Variation in the frequency of extra-pair paternity in birds: a comparison of an island and a mainland population of blue tits. Behaviour 137: 1317-1330.

74. Johnsen, A., Andersen, V., Sunding, C. & Lifjeld, J.T. 2000. Female bluethroats enhance offspring immunocompetence through extra-pair copulations. Nature 406: 296-299.

73. Nesje, M., Røed, K.H., Lifjeld, J.T., Lindberg, P. & Steen, O.F. 2000. Genetic relationships in the peregrine falcon (Falco peregrinus) analysed by microsatellite DNA markers. Molecular Ecology 9: 53-60.

72. Johnsen, A., Fiske, P., Amundsen, T., Lifjeld, J.T. & Rohde, P.A. 2000. Colour bands, mate choice and paternity in the bluethroat. Animal Behaviour 59: 111-119.

71. Lifjeld, J.T., Aas, C. K., Birkhead, T.R., Fletcher F., Krokene, C. & Rigstad, K. 2000. Variation in the number of spermatozoa in blue tit and great tit eggs. Auk 117: 246-249.

70. Rohde, P.A., Johnsen, A. & Lifjeld, J.T. 1999. Parental care and sexual selection in the bluethroat, Luscinia s. svecica: A field-experimental test of the differential allocation hypothesis. Ethology 105: 651-663.

69. Rohde, P.A., Johnsen, A. & Lifjeld, J.T. 1999. Female plumage coloration in the bluethroat Luscinia s. svecica: No evidence for an indicator of female quality. Condor 101: 96-104.

68. Krokene, C., Rigstad, K., Dale, M. & Lifjeld, J.T. 1998. The function of extra-pair paternity in blue tits and great tits: good genes or fertility insurance? Behavioral Ecology 9: 649-656.

67. Johnsen, A., Lifjeld, J.T., Rohde, P.A., Primmer, C.R. & Ellegren, H. 1998. Sexual conflict over fertilizations: female bluethroats escape male paternity guards. Behavioral Ecology and Sociobiology 43: 401-408.

66. Johnsen, A., Andersson, S., Örnborg, J. & Lifjeld, J.T. 1998. Ultraviolet plumage ornamentation affects social mate choice and sperm competition in bluethroats (Aves: Luscinia s. svecica); a field experiment. Proceedings of the Royal Society of London Series B 265: 1313-1318.

65. Pierce, E. P. & Lifjeld, J.T. 1998. High paternity without paternity assurance behavior in the purple sandpiper, a species with high paternal investment. Auk 115: 602-612.

64. Lifjeld, J. T., Slagsvold, T. & Ellegren, H. 1998. Experimentally reduced paternity affects paternal effort and reproductive success in pied flycatchers. Animal Behaviour 55: 319-329.

63. Lifjeld, J.T., Anthonisen, K., Blomqvist, D., Johnsen, A., Krokene, C. & Rigstad, K. 1998. Studying the influence of paternity on paternal effort: a comment on Kempenaers & Sheldon. Animal Behaviour 55: 235-238.

62. Bjørnstad, G. & Lifjeld, J. T. 1997. High frequency of extra-pair paternity in a dense and synchronous population of Willow Warblers Phylloscopus trochilus. Journal of Avian Biology 28: 319-324.

61. Birkhead, T.R., Briskie, J.V., Lifjeld, J.T. & Slagsvold, T. 1997. Breeding-cycle patterns of sperm storage in the pied flycatcher (Ficedula hypoleuca). Auk 114(4): 792-796.

60. Anthonisen, K., Krokene, C. & Lifjeld, J. T. 1997. Brood division is associated with fledgling dispersion in the bluethroat (Luscinia s. svecica). Auk 114(4): 553-561.

59. Slagsvold, T. & Lifjeld, J.T. 1997. Incomplete female knowledge of male quality may explain variation in extra-pair paternity in birds. Behaviour 134: 353-371.

58. Johnsen, A., Lifjeld, J.T. & Rohde, P.A. 1997. Coloured leg bands affect male mate-guarding behaviour in the bluethroat. Animal Behaviour 54: 121-130.

57. Lifjeld, J.T., Slagsvold, T., Dale, S. & Ellegren. H. 1997. A sexually selected paradox in the pied flycatcher: attractive males are cuckolded. Auk 114(1): 112-115.

56. Lifjeld, J.T., Slagsvold, T. & Ellegren, H. 1997. Experimental mate switching in pied flycatchers: male copulatory access and fertilization success. Animal Behaviour 53: 1225-1232.

55. Lifjeld, J.T. & Bjerke, B.-A. 1996. Evidence for assortative pairing by the cabaret and flammea subspecies of the common redpoll Carduelis flammea in SE Norway. Fauna norvegica Series C, Cinclus 19: 1-8.

53. Porkert, J., Lifjeld, J.T. & Tornberg, R. 1996. Backcrossings of Tetrao hybrids (T. tetrix male x T. urogallus female) with their parent species: a description of female offspring based on museum skins. Aquilo Ser. Zoologica 29: 33-41.

54. Krokene, C., Anthonisen, K., Lifjeld, J.T. & Amundsen, T. 1996. Paternity and paternity assurance behaviour in the bluethroat, Luscinia s. svecica. Animal Behaviour 52: 405-417.

52. Bjørnstad, G. & Lifjeld, J.T. 1996. Male parental care promotes early fledging in an open-nester, the willow warbler Phylloscopus trochilus. Ibis 138: 229-235.

51. Chek, A.A., Lifjeld, J.T. & Robertson, R.J. 1996. Lack of mate guarding in a territorial passerine with low intensity of sperm competition, the pied flycatcher (Ficedula hypoleuca). Ethology 102: 134-145.

50. Ellegren, H., Lifjeld, J.T., Slagsvold, T. & Primmer, C.R. 1995. Handicapped males and extrapair paternity in pied flycatchers: a study using microsatellite markers. Molecular Ecology 4: 739-744.

49. Whittingham, L.A. & Lifjeld, J.T. 1995. Extra-pair fertilizations increase the opportunity for sexual selection in the monogamous House Martin Delichon urbica. Journal of Avian Biology 26: 283-288.

48. Whittingham, L.A. & Lifjeld, J.T. 1995. High paternal investment in unrelated young: Extra-pair paternity and male parental care in house martins. Behavioral Ecology and Sociobiology 37: 103-108.

47. Johnsen, A. & Lifjeld, J.T. 1995. Unattractive males guard their mates more closely: an experiment with bluethroats (Aves, Turdidae: Luscinia s. svecica). Ethology 101: 200-212.

46. Lifjeld, J.T. & Marstein, B. 1994. Paternity assurance behaviour in the House Martin, Delichon urbica. Journal of Avian Biology 25: 231-238.

45. Lifjeld, J.T., Dunn, P.O. & Westneat, D.F. 1994. Sexual selection by sperm competition in birds: male-male competition or female choice ? Journal of Avian Biology 25: 244-250.

44. Dunn, P.O. & Lifjeld, J.T. 1994. Can extra-pair copulations be used to predict extra-pair paternity in birds? Animal Behaviour 47, 983-985.

43. Lifjeld, J.T. 1994. Do female House Sparrows copulate with extra-pair mates to enhance their fertility? Journal of Avian Biology 25: 75-76.

42. Dunn, P.O., Whittingham, L.A., Lifjeld, J.T., Robertson, R.J. & Boag, P.T. 1994. Effects of breeding density, synchrony and experience on extrapair paternity in tree swallows. Behavioral Ecology 5: 123-129.

41. Slagsvold, T & Lifjeld, J.T. 1994. Polygyny in birds: the role of competition between females for male parental care. American Naturalist 143: 59-94.

40. Lifjeld, J.T. 1993. Book review: The Pied Flycatcher (Lundberg, A. & Alatalo, R.V., T. & A. D. Poyser 1992). Ornis Svecica 3, 86-88.

39. Chek, A.A., Lifjeld, J.T. & Robertson, R.J. 1993. Captive study of copulation in the pied flycatcher Ficedula hypoleuca. Fauna norvegica Series C, Cinclus 16: 67-73.

38. Venier, L.A., Dunn, P.O., Lifjeld, J.T., Robertson, R.J. 1993. Behaviour patterns of extra-pair copulation in tree swallows. Animal Behaviour 45: 412-415.

37. Lifjeld, J.T., Dunn, P.O., Robertson, R.J. & Boag, P.T. 1993. Extra-pair paternity in monogamous tree swallows. Animal Behaviour 45: 213-229.

36. Lifjeld, J.T. & Robertson, R.J. 1992. Female control of extra-pair fertilization in tree swallows. Behavioral Ecology and Sociobiology 31: 89-96.

35. Slagsvold, T. & Lifjeld, J.T. 1992. Plumage color is a condition-dependent sexual trait in male pied flycatchers. Evolution 46: 825-828.

34. Lifjeld, J.T., Breiehagen, T. & Lampe, H.M. 1992. Pied Flycatchers failed to use nestling size as a cue to favour own genetic offspring in a communally raised brood. Ornis Scandinavica 23: 199-201.

33. Lifjeld, J.T., Slagsvold, T. & Lampe, H.M. 1991. Low frequency of extra-pair paternity in pied flycatchers revealed by DNA fingerprinting. Behavioral Ecology and Sociobiology 29: 95-101.

32. Lifjeld, J.T. & Slagsvold, T. 1991. Sexual conflict among polygynous pied flycatchers feeding young. Behavioral Ecology 2: 106-115.

31. Slagsvold, T. & Lifjeld, J.T. 1990. Return rates of male pied flycatchers: an experimental study by manipulating breeding success. In: Blondel, J., Gosler, A., Lebreton, J.D. & McCleery, R. (eds.). Population biology of passerine birds. NATO ASI Series G "Ecological Sciences", Springer Verlag. Volume 24: 441-452.

30. Lifjeld, J.T. & Slagsvold, T. 1990. Manipulations of male parental investment in polygynous pied flycatchers. Behavioral Ecology 1: 48-54.

29. Dale, S., Amundsen, T., Lifjeld, J.T. & Slagsvold, T. 1990. Mate sampling behaviour of female pied flycatchers: evidence for active mate choice. Behavioral Ecology and Sociobiology 27: 87-91.

28. Slagsvold, T. & Lifjeld, J.T. 1990. Influence of male and female quality on clutch size in tits (Parus spp.). Ecology 71: 1258-1266.

27. Lifjeld, J.T. & Slagsvold, T. 1989. Nutritional state influences the allocation of incubation feeding by polygynous pied flycatcher males. Animal Behaviour 38: 903-904.

26. Slagsvold, T. & Lifjeld, J.T. 1989. Constraints on hatching asynchrony and egg size in pied flycatchers. Journal of Animal Ecology 58: 837-850.

25. Slagsvold, T. & Lifjeld, J.T. 1989. Hatching asynchrony in birds: the hypothesis of sexual conflict over parental investment. American Naturalist 134: 239-253.

24. Lifjeld, J.T. 1989. Central place foraging: optimal load size for net and gross energy maximizers. Oikos 55: 397-401.

23. Lifjeld, J.T. & Slagsvold, T. 1989. Allocation of parental investment by polygynous pied flycatcher males. Ornis Fennica 66: 3-14.

22. Lifjeld, J.T. & Slagsvold, T. 1989. How frequent is cuckoldry in pied flycatchers Ficedula hypoleuca? - Problems with the use of heritability estimates of tarsus length. Oikos 54: 205-210.

21. Slagsvold, T. & Lifjeld, J.T. 1988. Ultimate adjustment of clutch size to parental feeding capacity in a passerine bird. Ecology 69: 1918-1922.

20. Slagsvold, T. & Lifjeld, J.T. 1988. Pied flycatchers prefer dry nest cavities. Fauna norvegica Serie C, Cinclus 11: 67-70.

19. Lifjeld, J.T. & Slagsvold, T. 1988. Feeding trios in the pied flycatcher Ficedula hypoleuca. Fauna norvegica Serie C, Cinclus 11: 100-102.

18. Lifjeld, J.T. 1988. Prey choice and nestling hunger: an experiment with pied flycatchers Ficedula hypoleuca. Animal Behaviour 36: 134-139.

17. Lifjeld, J.T. 1988. Geographical origins of Knots Calidris canutus on autumn migration at Jomfruland, SE Norway. Fauna norvegica Serie C, Cinclus 11: 57-60.

16. Stenmark, G., Slagsvold, T. & Lifjeld, J.T. 1988. Polygyny in the pied flycatcher Ficedula hypoleuca: a test of the deception hypothesis. Animal Behaviour 36: 1646-1657.

15. Slagsvold, T., Lifjeld, J.T., Stenmark, G. & Breiehagen, T. 1988. On the cost of searching for a mate in female pied flycatchers Ficedula hypoleuca. Animal Behaviour 36: 433-442.

14. Slagsvold, T. & Lifjeld, J.T. 1988. Plumage colour and sexual selection in the pied flycatcher Ficedula hypoleuca. Animal Behaviour 36: 395-407.

13. Slagsvold, T. & Lifjeld, J.T. 1988. Why are some birds polyterritorial? Ibis 130: 65-68.

12. Lifjeld, J.T. & Slagsvold, T. 1988. Mate fidelity of renesting pied flycatchers Ficedula hypoleuca in relation to characteristics of the pair mates. Behavioral Ecology and Sociobiology 22: 117-123.

11. Lifjeld, J.T. & Slagsvold, T. 1988. Female pied flycatchers Ficedula hypoleuca choose male characteristics in homogeneous habitats. Behavioral Ecology and Sociobiology 22: 27-36.

10. Lifjeld, J.T. & Slagsvold, T. 1988. Effects of energy costs on the optimal diet: an experiment with Pied Flycatchers Ficedula hypoleuca feeding nestlings. Ornis Scandinavica 19: 111-118.

9. Partali, V., Liaaen-Jensen, S., Slagsvold, T. & Lifjeld, J.T. 1987. Carotenoids in food chain studies. II. The food chain of Parus spp. monitored by carotenoid analysis. Comparative Biochemistry and Physiology 87B: 885-888.

8. Lifjeld, J.T., Slagsvold, T. & Stenmark, G. 1987. Allocation of incubation feeding in a polygynous mating system: a study on pied flycatchers Ficedula hypoleuca. Animal Behaviour 35: 1663-1669.

7. Slagsvold, T. & Lifjeld, J.T. 1986. Mate retention and male polyterritoriality in the pied flycatcher Ficedula hypoleuca. Behavioral Ecology and Sociobiology 19: 25-30.

6. Lifjeld, J.T. & Slagsvold, T. 1986. The function of courtship feeding during incubation in the pied flycatcher Ficedula hypoleuca. Animal Behaviour 34: 1441-1453.

5. Slagsvold, T. & Lifjeld, J.T. 1985. Variation in plumage colour of the Great tit Parus major in relation to habitat, season and food. Journal of Zoology, London (A) 206: 321-328.

4. Lifjeld, J. 1984. Prey selection in relation to body size and bill length of five species of waders feeding in the same habitat. Ornis Scandinavica 15: 217-226.

3. Lifjeld, J. 1984. Prey and grit taken by five species of waders at an autumn migration staging post in N Norway. Fauna norvegica Serie C, Cinclus 7: 28-36..

2. Lifjeld, J. 1983. Stomach content analyses of the Dunlin Calidris alpina: bias due to differential digestibility of prey items. Fauna norvegica Serie C, Cinclus 6: 43-46.

1. Lifjeld, J. 1982. Sex ratio of Goldcrests Regulus regulus on autumn migration. Fauna norvegica Serie C, Cinclus 5: 36-39.

Published May 31, 2011 9:17 AM - Last modified Nov. 22, 2022 5:09 PM