Humann-Guilleminot S, Clément S, Desprat J, Binkowski ŁJ, Glauser G, Helfenstein F. 2019. A large-scale survey of house sparrows feathers reveals ubiquitous presence of neonicotinoids in farmlands. Science of the Total Environment, 660:1091-1097. pdf


Rojas Mora A, Meniri M, Ciprietti S & Helfenstein F. 2018. Is sperm morphology functionally related to sperm swimming ability? A case study in a wild passerine bird with male hierarchies. BMC Evolutionary Biology, 18:142. pdf

Humann-Guilleminot S, Blévin P, Azou--Barré A, Yacoumas A, Gabrielsen GW, Chastel O & Helfenstein F. 2018. Sperm collection in black-legged kittiwakes and characterization of sperm velocity and morphology. Avian Research, 9:24. pdf

Losdat S & Helfenstein F. 2018. Relationships between sperm morphological traits and sperm performance in wild great tits. Journal of Ornithology, 159:805-814. pdf

Losdat S, Blount J, Marri V, Maronde L, Richner H & Helfenstein F. 2018. Effects of an early-life paraquat exposure on adult resistance to oxidative stress, plumage colouration and sperm performance in a wild bird. Journal of Animal Ecology, 87:1137-1148. pdf


Mendonça R, Gning O, Di Césaré C, Lachat L, Helfenstein F & Glauser G. 2017. Sensitive and selective quantification of free and total malondialdehydes in plasma using UHPLC-HRMS. Journal of Lipid Research, 58: 1924-1931. pdf

Rojas Mora A, Firth A, Blareau S & Helfenstein F. 2017. Oxidative stress affects sperm performance and ejaculate redox status in subordinate house sparrows. Journal of Experimental Biology, 220: 2577-2588. pdf

Merkling T, Blanchard P, Chastel O, Glauser G, Vallat-Michel A, Hatch SA, Danchin E & Helfenstein F. 2017. Reproductive effort and oxidative stress: effects of offspring sex and number on the physiological state of a long-lived bird. Functional Ecology, 31: 1201-1209. pdf

Rojas Mora A, Meniri M, Gning O, Glauser G, Vallat A & Helfenstein F. 2017. Antioxidant allocation modulates sperm quality across changing social environments. PLoS ONE, 12(5): e0176385 pdf 

Costantini D & Helfenstein F. 2017. Oxidative stress and signal honesty. Frontiers in Ecology and Evolution, 5:32 pdf

Rojas Mora A, Meniri M, Ciprietti S & Helfenstein F. 2017. Social dominance explains within-ejaculate variation in sperm design in a passerine bird. BMC Evolutionary Biology, 17:66. pdf

Fasel N, Wesseling C, Helfenstein F & Richner H. 2017. Alternative reproductive tactics, sperm mobility and oxidative stress in Carollia perspicillata (Seba's short-tailed bat). Behavioral Ecology and Sociobiology, 71: 11. pdf


Wesseling C, Fasel N, Richner H & Helfenstein F. 2016. Modification of sperm quality after sexual abstinence in Seb'as short-tailed bat, Carollia perspicillata. Journal of Experimental Biology, 219:1363-1368. pdf

Merkling T, Perrot C, Helfenstein F, Ferdy J-B, Gaillard L, Lefol E, Voisin E, Hatch SA, Danchin E & Blanchard P. 2016. Maternal effects as drivers of sibling competition in a parent-offspring conflict ? An experimental test. Ecology and Evolution, 6:3699-3710. pdf

Rojas Mora A, Meniri M, Glauser G, Vallat A & Helfenstein F. 2016. Badge size reflects sperm oxidative status within social groups in the house sparrow Passer domesticus. Frontiers in Ecology and Evolution, 4:67. pdf


Jacob S, Parthuisot N, Vallat A, Ramon-Portugal F, Helfenstein F & Heeb P. 2015. Microbiome affects egg carotenoid investment, nestling development and adult oxidative cost of reproduction in great tits. Functional Ecology, 29:1048-1058. pdf  

Fasel NJ, Helfenstein F, Buff S & Richner H. 2015. Electroejaculation and semen buffer evaluation in the microbat Carollia Perspicillata. Theriogenology, 83:904-910. pdf

Jenni-Eiermann S, Helfenstein F, Vallat A, Glauser G & Jenni L. 2015. Corticosterone: Effects on feather quality and depositon into feathers. Methods in Ecology and Evolution, 6:237-246. pdf


Losdat S, Helfenstein F, Blount JD & Richner H. 2014. Resistance to oxidative stress shows low heritability and high environmental variance in a wild bird. Journal of Evolutionary Biology, 27:1990-2000. pdf


Podlas K, Helfenstein F & Richner H. 2013. Brood reduction via intra-clutch variation in testosterone - an experimental test in the great tit. PLoS ONE, 8:e56672. pdf

Losdat S, Helfenstein F, Blount JD, Marri V, Maronde L & Richner H. 2013. Nestling erythrocyte resistance to oxidative stress predicts fledging success but not local recruitment in a wild bird. Biology Letters, 9. pdf


Losdat S, Helfenstein F, Saladin V & Richner H. 2011. Higher in vitro resistance to oxidative stress in extra-pair offspring. Journal of Evolutionary Biology, 24:2525-2530. pdf

Leclaire S, Bourret V, Wagner RH, Hatch SA, Helfenstein F, Chastel O & Danchin E. 2011. Behavioral and physiological response to male handicap in chick-rearing black-legged kittiwake. Behavioral Ecology, 22:1156-1165. pdf

Losdat S, Helfenstein F, Gaude B & Richner H. 2011. Reproductive effort transiently reduces antioxidant capacity in a wild bird. Behavioral Ecology, 22:1218-1226. pdf

Losdat S, Richner H, Blount JD & Helfenstein F. 2011. Immune activation reduces sperm quality in the great tit . PLoS ONE, 6: e22221. pdf


Losdat S, Helfenstein F, Gaude B & Richner H. 2010. Effect of sibling competition and male carotenoid supply on offspring condition and oxidative stress. Behavioral Ecology, 21: 1271-1277. pdf

Leclaire S, Helfenstein F, Degeorges A, Wagner RH & Danchin E. 2010. Family size and sex-specific parental effort in black-legged kittiwakes. Behaviour, 147: 1841-1862. pdf

Helfenstein F, Losdat S, Møller AP, Blount JD & Richner H. 2010. Sperm of colourful males are better protected against oxidative stress. Ecology Letters, 13: 213-222. pdf

Helfenstein F, Podevin M & Richner H. 2010. Sperm morphology, swimming velocity and longevity in the house sparrow Passer domesticus. Behavioral Ecology and Sociobiology, 64: 557-565. pdf


Mulard H, Danchin E, Talbott S, Ramey A, Hatch SA, White JF, Helfenstein F & Wagner RH. 2009. Evidence that pairing with genetically similar mates is maladaptive in a monogamous bird. BMC Evolutionary Biology, 9: 147. pdf

Helfenstein F, Szép T, Nagy Z, Kempenaers B & Wagner RH. 2008. Between-male variation in sperm size, velocity and longevity in sand martins Riparia riparia. Journal of Avian Biology, 39: 647-652. pdf

White JF, Wagner RH, Helfenstein F, Hatch SA, Mulard H, Naves LC & Danchin E. 2008. Multiple deleterious effects of experimentally aged sperm in a monogamous bird. Proceedings of the National Academy of Sciences, USA. pdf

Helfenstein F, Losdat S, Saladin V & Richner H. 2008. Females of carotenoid-supplemented males are more faithful and produce better quality offspring. Behavioral Ecology. pdf

Berthouly A, Helfenstein F, Tanner M & Richner H. 2008. Sex-related effects of maternal egg investment on offspring in relation to carotenoid availability in the great tit. Journal of Animal Ecology, 77: 74-82. pdf

Helfenstein F, Berthouly A, Tanner M, Karadas F & Richner H. 2008. Nestling begging activity and parental effort in relation to pre-laying carotenoid availability. Behavioral Ecology, 19: 108-115 pdf

Berthouly A, Helfenstein F, & Richner H. 2007. Cellular immune response, stress resistance and competitiveness in nestling great tits in relation to maternally transmitted carotenoids. Functional Ecology, 21: 335-343. pdf

Helfenstein F, Danchin E & Wagner RH. 2004. Assortative mating and sexual size dimorphism in kittiwakes. Waterbirds, 27: 350-354. pdf

Helfenstein F, Danchin E & Wagner RH. 2004. Is male unpredictability a paternity assurance strategy ? Behaviour, 141: 675-690. pdf

Wagner RH, Helfenstein F & Danchin E. 2004. Choice for young sperm by monogamous female kittiwakes. Proceedings of the Royal Society of London, Series B (Supplement), 271: S134-S137. pdf

Helfenstein F, Tirard C, Danchin E & Wagner RH. 2004. Low frequency of extra-pair paternity and high frequency of adoption in Black-Legged Kittiwakes. The Condor, 106: 150-157. pdf

Helfenstein F, Wagner RH & Danchin E. 2003. Sexual conflict over sperm ejection in monogamous pairs of kittiwakes. Behavioral Ecology and Sociobiology, 54: 370-376. pdf

Helfenstein F, Wagner RH, Danchin E & Rossi JM. 2003. Functions of courtship feeding in black-legged kittiwakes: natural and sexual selection. Animal Behaviour, 65: 1027-1033. pdf

Tirard C, Helfenstein F & Danchin E. 2002. Polymorphic microsatellites in Rissa tridactyla. Molecular Ecology Notes, 2: 431-433. pdf

Wagner RH, Danchin E, Boulinier T & Helfenstein F. 2000. Colonies as byproducts of commodity selection. Behavioral Ecology, 11: 572-573. pdf