Data from: Comparative support for the expensive tissue hypothesis: big brains are correlated with smaller gut and greater parental investment in Lake Tanganyika cichlids
Tsuboi, Masahito, Uppsala University
Husby, Arild, University of Helsinki
Kotrschal, Alexander, Stockholm University
Hayward, Alexander, Stockholm University
Büchel, Séverine Denise, Stockholm University
Zidar, Josefina, Linköping University
Løvlie, Hanne, Linköping University
Kolm, Niclas, Stockholm University
Published May 04, 2016 on Dryad.
Cite this dataset
Tsuboi, Masahito et al. (2016). Data from: Comparative support for the expensive tissue hypothesis: big brains are correlated with smaller gut and greater parental investment in Lake Tanganyika cichlids [Dataset]. Dryad. https://doi.org/10.5061/dryad.26pt6
The brain is one of the most energetically expensive organs in the vertebrate body. Consequently, the energetic requirements of encephalization are suggested to impose considerable constraints on brain size evolution. Three main hypotheses concerning how energetic constraints might affect brain evolution predict covariation between brain investment and i) investment into other costly tissues, ii) overall metabolic rate, and iii) reproductive investment. To date, these hypotheses have mainly been tested in homeothermic animals and the existing data are inconclusive. However, there are good reasons to believe that energetic limitations might play a role in large-scale patterns of brain size evolution also in ectothermic vertebrates. Here we test these hypotheses in a group of ectothermic vertebrates, the Lake Tanganyika cichlid fishes. After controlling for the effect of shared ancestry and confounding ecological variables, we find a negative association between brain size and gut size. Furthermore, we find that the evolution of a larger brain is accompanied by increased reproductive investment into egg size and parental care. Our results indicate that the energetic costs of encephalization may be an important general factor involved in the evolution of brain size also in ectothermic vertebrates.
Data on body weight, brain right, gut length of Lake Tanganyika cichlids. Other information used in the study is presented as supplementary material.