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 Sept21.jpg
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 August issue, BES has a new cover image showing an humpback whale.

A surface active humpback whale (Megaptera novaeangliae) migrating along the eastern coastline of Australia, from the breeding grounds in the Great Barrier Reef, to feeding grounds in the Antarctic. Whilst migrating, male humpback whales are still attempting to breed with females. They use various acoustic signals (e.g. singing, vocal calls and surface-generated sounds from surface behaviours) to mediate these breeding interactions. Photo credits: Cetacean Ecology and Acoustics Laboratories.

For more information see

Dunlop RA, Noad RJ (2021) The eavesdropping risk of conspicuous sexual signaling in humpback whales. Behav Ecol Sociobiol 75:124

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