Michael Jennions

Michael Jennions
Rm W311, Level 3, RN Robertson Building (46)



I grew up in South Africa. My MSc was on sperm competition in frogs. One highlight was designing a frog condom (yes, a plastic bag works). I was then lucky to get funding for a PhD in England. I was all set to work on meerkats, but ended up studying sexual selection in a range of animals and plants under the wonderful supervision of Marion Petrie at Oxford. This gave me a wide range of experience, but no technical or taxonomic specialty. In early 1996, Patricia Backwell and I headed off to the Smithsonian Tropical Research Institute in Panama. While applying for post-docs I learned the pleasures of sundowners, how to fall off a motorbike, travelled to Barbados and Trinidad, and discovered the virtue of wearing boxers rather than briefs when living in the tropics. In late 1997 my unemployment ended when I received a STRI Fellowship. I continued my tradition of working on new taxa: parental care and mate desertion in cichlids and life history evolution in a live-bearing fish. I arrived in Australia in 2001. Here I have worked on crickets, mosquitofish, beetles, meta-analyses, publication bias, and occasionally helped with fieldwork on fiddler crabs in collaboration with Pat Backwell. See also my group web site with info on students and collaborators who do all the real work.


Research awards

Research interests

I am a evolutionary biologist with a special interest in behavioural ecology. I mainly work on sexual selection and reproductive decisions (female choice, male-male competition, sperm competition, parental care, life histories and so on). I try to test predictions from general theory that can be widely applied across species: Do females prefer symmetrical males? Is the elaboration of sexual signals constrained by predation or by trade-offs with investment in other fitness-enhancing traits? I tend to ask a question and then pick a study animal that can be used to answer it. I have no taxonomic prejudice, but I do think it is important to feel some affinity with your study animal. You have to think it's cool. I am respectful of the incredible expertise many colleagues possess concerning the biology of specific taxa.

Practically speaking, my empirical research usually involves detailed observation of animal behaviour in the laboratory and, less so (unfortunately), in the field. Most of my work is experimental because of the need to determine causality, but I also try to collect data on phenotypic correlations between traits of interest. Together these data provide a fuller picture. For example, an experiment may show that courting is a costly act, but one would still like to know whether males that court more live longer. Both pieces of information are essential. The touted superiority of experimental approaches in behavioural ecology depends on the credibility of the manipulation. In my view, many experiments do not demonstrate what they purport to show if the animal's perception disagrees with the way in which the experimenter describes it. For example, many manipulations of 'confidence of paternity' or 'perceived sex ratio' are potentially flawed.

I have a long standing interest in meta-analysis. Meta-analytic techniques attempt to quantitatively review a field of study using custom-designed statistics. The alternative approach is the traditional narrative review. The later is clearly fraught with problems of prejudice and failure to consider fundamental factors such as the effect of sample size on the likelihood of detecting a relationship. Meta-analysis is no longer controversial in ecology and evolution, and continues to gain supporters.

Finally, I also collaborate with colleagues, notably Hanna Kokko, Lutz Fromhage and Jussi Lehtonen, in developing/explaining sexual selection theory.

Recent grants

All external funding is from the ARC

  • Discovery (Jennions, Kappeler, Fichtel) The fitness consequences of age-dependent changes in cognitive abilities (2019-2021)
  • Discovery (Jennions) Population Divergence and the Thermal Ecology of Sexual Conflict (2015-2018)
  • Discovery (Jennions & Kokko, including DORA): Sex and the generation gap: seasonal changes in sex allocation (2012-2014)
  • QEII Fellowship (Jennions): Does size really matter? Selection, constraints and allometry (2007-2011)
  • Discovery (Backwell & Jennions): Changes in the intensity of sexual selection with density and age (2007-2009)
  • Discovery (Jennions): What is the genetic relationship between attractiveness, fighting ability and fertilization success in field crickets? (2005-2006) 
  • Discovery (Hunt, Brooks & Jennions): Putting sexual selection in a life-history context; what is meant by "genetic quality"? (2002-2004) 
  • Large Grant (Jennions): Lovers & Fighters: Does opposing sexual selection maintain variation in sexual traits? (2001-2003) 
  • ARF Fellowship (Jennions): Lovers & Fighters (2001-2005).



  • BIOL 3131 Evolutionary & Behavioural Ecology
  • BIOL3132 Evolutionary & Behvaioural Ecology Field Course
  • BIOL1003 Evolution, Ecology & Genetics


  • Vision and hearing in BIOL1003 Evolution, Ecology & Genetics
  • Parasitology, and I helped with the field component for BIOL2112 Marine Biology.
  • Guest lectures in BIOL2111 Australian Vertebrates and BIAN 2124 Human & Animal Society



Check out Michael's Google Scholar Page or - for everyone in the Lab's papers - go to the lab website.  
Mewanwhile, here are a few high profile papers from the lab that have appeared in the last few years:

Fromhage L, Jennions MD. 2019. The strategic reference gene: an organismal theory of inclusive fitness. Proceedings of the Royal Society Series B 286: 20190459

O'Dea R, Lagisz M,  Jennions MD, Nakagawa S. 2018. Gender differences in individual variation in academic grades fail to fit expected patterns for STEM. Nature Communications ​9:3777

Fromhage L, Jennions MD. 2016. Coevolution of parental investment and sexually selected traits drives sex role divergence. Nature Communications ​7:12517

Booksmythe I, Head ML, Keogh JS, Jennions MD. 2016. Fitness consequences of artificial selection on relative male genital size. Nature Communications 7: 11597

Head ML, Holman L, Lanfear R, Kahn AT, Jennions MD. 2015. The extent and consequences of P-hacking in science.  Public Library of Science, Biology 13: e1002106

Kahn AT, Kokko H, Jennions MD. 2013.  Adaptive sex allocation in anticipation of changes in offspring mating opportunities. Nature Communications 4:1603




Updated:  17 July 2019/Responsible Officer:  Director RSB/Page Contact:  Webmaster RSB