Chargé de Recherche CNRS


           CEFE (CNRS-UMR 5175)
           Campus du CNRS
           1919, Route de Mende
           34293 Montpellier Cedex 05

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           Twitter: @TimJanicke

 I am an evolutionary biologist with main interest in sexual selection. Most of my work focuses on the evolutionary causes and consequences of sex-specific selection. To adress my questions, I am primarily using lab experiments, meta-analyses and genomics. Model organisms include birds, flatworms, molluscs, fruit flies, and flour beetles.

(for more information see my profiles on ResearchGate and GoogleScholar)


Academic history

since 2018 CNRS Researcher (Chargé de recherche): Centre d'Ecologie Fonctionelle et Evolutive, Montpellier, France.

2017 – 2018 PostDoc: Evolution, Behaviour and Environment Group School of Life Sciences, University of Sussex, UK. 'Evolutionary genomics of sexual antagonism' with Dr. Ted Morrow.

2014  2016 PostDoc: Centre d'Ecologie Fonctionelle et Evolutive (CEFE), Montpellier, France. 'Evolution of self-fertilization in hermaphrodites: an animal perspective' hosted by Dr. Patrice David & Dr. Philippe Jarne

2011  2014 SNSF PostDoc Fellow: Centre d'Ecologie Fonctionelle et Evolutive (CEFE), Montpellier, France. 'Quantitative genetics of male and female reproduction in a simultanoeus hermaphrodite' hosted by Dr. Patrice David

2010  2011 PostDoc: Zoological Institute, University of Basel, Switzerland. 'Quantitative test of sex allocation theory in a siumultaneous hermaphrodite' hosted by Dr. Lukas Schärer

2007  2010 PhD: Zoological Institute, University of Basel, Switzerland. ’Sex allocation and sexual selection in a simultaneous hermaphrodite’ supervised by Dr. Lukas Schärer

2001  2006 Diploma (equivalent to MSc): Institute of Ecology, University of Jena, Germany. ’Communication in Brown Skuas Catharacta antarctica lonnbergi: Functions of multimodal signalling’ supervised by Dr. Hans-Ulrich Peter

1999  2001 Basic studies in Biology: University of Greifswald, Germany.



(for PDF copies please click here)

Fromonteil, S, Marie-Orleach L, Winkler, L & Janicke, T (2023). Sexual selection in females and the evolution of polyandry. PLoS Biology 21:e3001916.

Winkler, L & Janicke, T (2022). Diet quality impairs male and female reproductive performance and affects the opportunity for selection in an insect model. Ecology and Evolution 12:e9533.

Moiron, M, Martin, OY, Winkler L, & Janicke, T (2022). Sexual selection moderates heat stress response in males and females. Functional Ecology 36:3096-3106.

Janicke, T, Chapuis, E, Meconcelli, S, Bonel, N, Delahaie, B & David, P (2022). Environmental effects on the genetic architecture of fitness components in a simultaneous hermaphrodite. J. Anim. Ecol., 91, 124-137.

Harper, JA, Janicke, T & Morrow, EH (2021). Systematic review reveals multiple sexually antagonistic polymorphisms affecting human disease and complex traits. Evolution, 75, 3087-3097.

Winkler, L, Moiron, M, Morrow, EH & Janicke, T (2021). Stronger net selection on males across animals. eLife, 10, e68316.

Janicke, T & Fromonteil, S (2021). Sexual selection and sexual size dimorphism in animals. Biol. Lett., 17, 20210251.

Tonnabel, J, David, P, Janicke, T, Lehner, A, Mollet, JC, Pannell, JR & Dufay, M (2021). The scope for postmating sexual selection in plants. Trends Ecol. Evol., 36, 556-567.

Janicke, T, Marie-Orleach, L, Aubier, TG, Perrier, C & Morrow, EH (2019). Assortative mating in animals and its role for speciation. Am. Nat., 194, 865-875.

Janicke, T & Morrow, EH (2019). Sexual selection. Evolution, Medicine and Public Health, 2019, 36.

Bonel N, Noël E, Janicke T, Sartori K, Chapuis E, Ségard A, Meconcelli S, Pélissié B, Sarda V, David, P (2018). Asymmetric evolutionary responses to sex‐specific selection in a hermaphrodite. Evolution 72: 2181-2201.

Janicke T, Ritchie MG, Morrow EH, and Marie-Orleach L (2018) Sexual selection predicts species richness across the animal kingdom. Proceedings of the Royal Society B: Biological Sciences 285:20180173.

Janicke T, Morrow, EH (2018) Operational sex ratio predicts the opportunity and direction of sexual selection across animals. Ecology Letters 21: 384-391.

Garefalaki ME, Kalyva S, Janicke T, Staikou A (2017). Intraspecific variation in reproductive characters is associated with the strength of sexual selection in the hermaphroditic land snail Cornu aspersum. Behav Ecol Sociobiol 71: 150.

Anthes N, Häderer IK, Michiels NK, Janicke T (2017) Measuring and interpreting sexual selection metrics - evaluation and guidelines. Methods in Ecology and Evolution 8: 918–931.

Janicke T, Sandner P, Ramm SA, Vizoso DB, Schärer L (2016) Experimentally evolved and phenotypically plastic responses to enforced monogamy in a hermaphroditic flatworm. J Evol Biol 29: 1713-1727.

Janicke T, Häderer IK, Lajeunesse MJ, Anthes N (2016) A plea for understanding diversity in sexual selection. Science Advances (E-Letter, 15.04.).

Noël E, Chemtob Y, Janicke T, Sarda V, Pélissié B, Jarne P, and David P (2016) Reduced mate availability leads to evolution of self-fertilization and purging of inbreeding depression in a hermaphrodite. Evolution 70: 625-640.

Marie-Orleach L, Janicke T, Vizoso DB, David P, Schärer L (2016) Quantifying episodes of sexual selection: Insights from a transparent worm with fluorescent sperm. Evolution 70: 314-328.

Janicke T, Häderer IK, Lajeunesse MJ, Anthes N (2016) Darwinian sex roles confirmed across the animal kingdom. Science Advances 2: e1500983.

Janicke T, Chapuis E (2016) Condition-dependence of male and female reproductive success: insights from a simultaneous hermaphrodite. Ecology and Evolution 6: 830-841.

Graham S, Chapuis E, Meconcelli S, Bonel N, Alda P, Sartori S, Christophe A, David P, Janicke T (2015) Size-assortative mating in simultaneous hermaphrodites: an experimental test and a meta-analysis. Behav Ecol Sociobiol 69: 1867-1878.

Janicke T, David P, Chapuis E, (2015) Environment-dependent sexual selection: Bateman's parameters under varying levels of food availability. Am Nat 185: 756-768.

Schärer L, Janicke T, Ramm, SA (2015). Sexual conflict in hermaphrodites. In Rice WR & Gavrilets S (eds). The Genetics and Biology of Sexual Conflict. Cold Spring Harbor Perspectives in Biology. Cold Spring Harbor Press.

Marie-Orleach L, Janicke T, Vizoso DB, Eichmann M, Schärer L (2014) Fluorescent sperm in a transparent worm: validation of a GFP marker to study sexual selection. BMC Evol Biol 14: 148.

Janicke T, Vellnow N, Lamy T, Chapuis E, David P (2014) Inbreeding depression of mating behavior and its reproductive consequences in a freshwater snail. Behav Ecol 25: 288-299.

Janicke T, Marie-Orleach L, De Mulder K, Berezikov E, Ladurner P, Vizoso DB, Schärer L (2013) Sex allocation adjustment to mating group size in a simultaneous hermaphrodite. Evolution 67: 3233–3242.

Janicke T, Vellnow N, Sarda V, David P (2013) Sex-specific inbreeding depression depends on the strength of male-male competition. Evolution 67: 2861-2875.

Roulin A, Routtu J, Hall MD, Janicke T, Colson I, Haag CR, Ebert, D (2013). Local adaptation of sex-induction in a facultative sexual crustacean: insights from QTL mapping and natural populations of Daphnia magna. Mol Ecol 22: 3567-3579.

Marie-Orleach L, Janicke T, Schärer L (2013) Effects of mating status on copulatory and post-copulatory behaviour in a simultaneous hermaphrodite. Anim Behav 85: 453-461.

Janicke T, Kesselring H, Schärer L (2012) Strategic mating effort in a simultaneous hermaphrodite: the role of the partner's feeding status. Behav Ecol Sociobiol 66: 593-601.

Janicke T, Sandner P, Schärer L (2011) Determinants of female fecundity in a simultaneous hermaphrodite: the role of polyandry and food availability. Evol Ecol 25: 203-218.

Janicke T, Schärer L (2010) Sperm competition affects sex allocation but not sperm morphology in a flatworm. Behav Ecol Sociobiol 64: 1367-1375.

Janicke T, Schärer L (2009) Sex allocation predicts mating rate in a simultaneous hermaphrodite. Proc R Soc B-Biol Sci 276:4247-4253.

Schärer L, Janicke T (2009) Sex allocation and sexual conflict in simultaneously hermaphroditic animals. Biol Lett 5:705-708.

Janicke T, Schärer L (2009) Determinants of mating and sperm-transfer success in a simultaneous hermaphrodite. J Evol Biol 22:405-415.

Janicke T, Hahn S (2008) On the performance of brown skua, Catharacta antarctica lonnbergi, vocalizations: reply. Anim Behav 76: E3-E5.

Janicke T, Hahn S, Ritz MS & Peter H-U (2008) Vocal performance reflects individual quality in a non-passerine. Anim Behav 75: 91-98.

Janicke T, Ritz MS, Hahn S, Peter, H-U (2007) Sex recognition in Brown Skuas: Do acoustic signals matter? J Ornithol 148: 565-569.

Hahn S, Reinhardt K, Ritz MS, Janicke T, Montalti D, Peter H-U (2007) Oceanographic and climatic factors differentially affect reproduction performance of Antarctic skuas. Mar Ecol-Prog Ser 334: 287-297.

Janicke T, Chakarov N (2007) Effect of weather conditions on the communal roosting behaviour of common ravens Corvus corax with unlimited food resources. J Ethol 25: 71-78.

Ritz MS, Hahn S, Janicke T & Peter H-U (2006) Hybridisation between South Polar Skua (Catharacta maccormicki) and Brown Skua (C. antarctica lonnbergi) in the Antarctic Peninsula region. Polar Biol 29: 153-159.