ArticleJournal of the Royal Society, Interface2015
Hydrodynamic drag constrains head enlargement for mouthbrooding in cichlids.
Article in Journal of the Royal Society, Interface, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
What it found
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Who cites it
9 citing papers in PubMed.
- Mothers modify the cost of reproduction by dynamic changes in antioxidant function and filial cannibalism.Biology letters · 2022Article
- Sex and male breeding state predict intraspecific trait variation in mouth-brooding fishes.Journal of fish biology · 2022Article
- A functional trade-off between trophic adaptation and parental care predicts sexual dimorphism in cichlid fish.Proceedings. Biological sciences · 2019Article
- Differences in the fast muscle methylome provide insight into sex-specific epigenetic regulation of growth in Nile tilapia during early stages of domestication.Epigenetics · 2019Article
- Dissecting a potential spandrel of adaptive radiation: Body depth and pectoral fin ecomorphology coevolve in Lake Malawi cichlid fishes.Ecology and evolution · 2018Article
- Intrasexual competition enhances reproductive isolation between locally adapted populations.Current zoology · 2018Article
- Article
- Why do placentas evolve? Evidence for a morphological advantage during pregnancy in live-bearing fish.PloS one · 2018Article
- Evolutionary divergence in life history traits among populations of the Lake Malawi cichlid fishEcology and evolution · 2017Article
Corrections and comments
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Authors and funding
3 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Presumably as an adaptation for mouthbrooding, many cichlid fish species have evolved a prominent sexual dimorphism in the adult head. Since the head of fishes serves as a bow during locomotion, an evolutionary increase in head volume to brood more eggs can trade-off with the hydrodynamic efficiency of swimming. Here, the differences between males and females in three-dimensional shape and size of the external head surfaces and the effect thereof on drag force during locomotion was analysed for the Nile tilapia (Oreochromis niloticus), a maternal mouthbrooder. To do so, three-dimensional body surface reconstructions from laser scans and computational fluid dynamics simulations were performed. After scaling the scanned specimens to post-cranial body volume, in order to theoretically equalize propulsive power, the external volume of the head of females was 27% larger than that of males (head length + 14%; head width + 9%). These differences resulted in an approximate 15% increase in drag force. Yet, hydrodynamics imposed important constraints on the adaptation for mouthbrooding as a much more drastic drop in swimming efficiency seems avoided by mainly enlarging the head along the swimming direction.
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