2018 Theo Bakker (photo by Petra Bakker-Pijn)

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.

New cover image for Behavioral Ecology and Sociobiology
BES cover January 2021 showing Angolan giraffes
Hiermes et al 2021_Fig 4.jpg

new paper online in Current Zoology. Males from tea-stained habitats were redder than males from clear-water habitats on North Uist, Scotland but had no different UV coloration. Females from both habitat types preferred males displaying UVA signals, most pronounced under clear-water conditions.

Starting with the January issue, BES has a new cover image showing Angolan giraffes. King (in the middle), an adult male desert-dwelling Angolan giraffe, joins a group of females and calves in the Hoarusib River valley in the northern Namib Desert, Namibia. A seasonal reduction in sexual segregation in this population may help to explain an adaptive seasonal birth pulse. Photo credit: Andreas Fernbrant


For more information, see Hart EE et al. (2021) Seasonal shifts in sociosexual behaviour and reproductive phenology in giraffe. Behav Ecol Sociobiol 75:15.

the second paper in Current Zoology came out and looked at UVA-based shoaling and mate preferences of lab-bred fishes from two photic habitats. The results for both shoaling- and mate preference tests were largely similar for wild-caught and lab-bred sticklebacks, thus hinting at a genetic basis for the preference patterns.

Ecological adaptation II
Ecological adaptation


female Eggler_edited.jpg