Welcome to the personal scientific website of Prof. Theo C. M. Bakker, University of Bonn, Germany. It gives an overview of my research and publications, emphasizing my work on sticklebacks during the past 35 years.

Perceived predation risk during development may affect mate choice patterns.
expeimental set-up for testing mate choice
Meuthen et al 2019 Fig1a.jpg
Vitt et al 2020 SciTotalEnviron grahical

Congratulations to Denis Meuthen on his latest paper in Behaviour. Cichlid fish that grew up in the presence of alarm cues differed from control fish in their contest behaviour. The effects were especially pronounced in alarm cue-exposed fish that lost a contest: they generally displayed lower aggression than winners but also lower aggression than losers of the control treatment.

Congrats to Denis Meuthen for another interesting paper on phenotypic plasticity that just appeared in Animal Behaviour "High perceived predation risk during development affects mutual mate choice in a cichlid fish."

• High-risk males but not females assess potential mates for a shorter time.

• High-risk fish of both sexes are unselective regarding their mate.

• In both sexes, control fish show disassortative preferences for high-risk mates.

Congratulations to Simon Vitt. The last chapter of his PhD-dissertation entitled "Differential investment in pre- and post-mating male sexual traits in response to prolonged exposure to ambient UVB radiation in a fish" went online in Science of The Total Environment .


Enhanced ultraviolet B radiation impaired stickleback fish growth and led to differential investment in pre- (intensity of red coloration) and post-mating (sperm number) sexual traits.

Publication in 
Science of the Total Environment
on phenotypic plasticity in


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