Dr. Brad Anholt

Dr. Brad Anholt
Office: CUN 224a

Areas of research focus

Evolutionary Ecology: 

  • Sex-ratio determination and the evolution of sex-ratio
  • Antipredator behaviour and its population dynamic consequences

I study evolution in real time using experiments that manipulate ecology to see evolutionary responses, or manipulate genetic material to see ecological consequences. I continue to work on antipredator behaviour using theoretical approaches but no longer have active empirical research in this area.

My main empirical and theoretical work is on sex-ratio determination and evolution using the intertidal copepod Tigriopus californicus. This 1mm long invertebrate has heritable variation for sex ratio that can be selected on, and that evolves in predictable ways when selection is relaxed. It has at least 6 loci on 5 chromosomes that contribute to sex determination. My lab has demonstrated that this kind of sex determination system can be long-term stable contrary to some theoretical assertions.

My current focus is on some of the social and environmental factors that influence sex-ratio determination in the context of this genetic system.

I am not accepting graduate students at this time.

Most recently director of the Bamfield Marine Sciences Centre without teaching responsibilities.

Bateman, A. and B.R. Anholt (2017) Maintenance of  polygenic sex determination in a fluctuating environment: An  individual-based model.  J. Evolutionary Biology 30:915-925.

Alexander, H.J., J.M.L. Richardson, Edmands, S. and B.R. Anholt (2015) Sex without sex chromosomes; genetic architecture of multiple loci independently segregating to determine sex ratios in the copepod Tigriopus californicus. J. Evolutionary Biology. 28:2196-2207 doi: 10.1111/jeb.12743

Hammill, E., P. Kratina, P., O.L. Petchey, M. Vos, and B.R. Anholt. (2015). Food web persistence is enhanced by non-trophic interactions. Oecologia 178:549-556 (DOI) 10.1007/s00442-015-3244-3

Alexander, H.J., J.M.L. Richardson, and B.R. Anholt (2014) Multi-generational response to artificial selection for biased clutch sex ratios among genetically divergent Tigriopus californicus populations. Journal of Evolutionary Biology 27:1921-1929

Bateman, A., Vos, M., Anholt, B.R. (2014) When to defend: anti-predator defenses and the predation sequence. American Naturalist  183: 847-855