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Genetic basis of adaptive shape differences in the cichlid head
R C Albertson1, J T Streelman, T D Kocher
1Hubbard Center for Genome Studies and the Department of Zoology, University of New Hampshire, 35 Colovos Road, Durham, NH 03824, USA. calbertson@forsyth.org
The Journal of Heredity
|August 16, 2003
Summary
Researchers explored the genetic basis of cichlid jaw diversity. They found that a few genetic factors control differences in bony elements, with many traits inherited together, suggesting developmental links.
Area of Science:
- Evolutionary biology
- Genetics
- Ichthyology
Background:
- East African cichlids display remarkable morphological diversity, driven by rapid trophic adaptations.
- Understanding the genetic underpinnings of this diversity is crucial for evolutionary studies.
Purpose of the Study:
- To investigate the genetic basis of oral jaw and head morphology differences in cichlids.
- To estimate the number of genetic factors controlling skeletal shape variations.
Main Methods:
- Morphological assessment of two Lake Malawi cichlid species and their F(1) and F(2) hybrids.
- Quantitative genetic analysis to estimate the effective number of genetic factors.
Main Results:
- Between 1 and 11 genetic factors likely underlie the shape differences of individual bony elements in the cichlid head.
- Many skeletal differences in the head and oral jaw apparatus are inherited together, indicating potential pleiotropy.
- Cosegregation of shape differences aligns with developmental units rather than functional ones.
Conclusions:
- The study provides initial insights into the genetic architecture of cichlid jaw evolution.
- Developmental constraints may play a significant role in the coordinated evolution of jaw morphology.