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Subspecific genetic differences in the saddle-back tamarin (Saguinus fuscicollis) postcranial skeleton.
L A Kohn1, L B Langton, J M Cheverud
1Program in Occupational Therapy, Washington University School of Medicine, St. Louis, Missouri 63108, USA. kohnl@msnotes.wustl.edu
American Journal of Primatology
|May 1, 2001
Summary
Postcranial morphology in saddle-back tamarin (Saguinus fuscicollis) hybrids reveals genetic differences between subspecies. Hybrids exhibited heterosis, suggesting distinct gene frequencies in these geographic isolates.
Area of Science:
- Primate Morphology
- Evolutionary Biology
- Genetics
Background:
- Saddle-back tamarins (Saguinus fuscicollis) subspecies are identified by coat and facial traits.
- Hybrid morphology offers insights into population differences and evolutionary divergence.
Purpose of the Study:
- Compare postcranial morphology between purebred saddle-back tamarin subspecies and their first-generation hybrids.
- Investigate if hybrid heterosis indicates genetic divergence between parental subspecies.
Main Methods:
- Measured 50 postcranial dimensions on 287 Saguinus fuscicollis skeletons.
- Corrected measurements for sex and environmental factors (wild-derived vs. laboratory-born).
Main Results:
- Females were generally larger than males, particularly in pelvic dimensions.
- Wild-derived tamarins were larger than laboratory-born individuals.
- Significant heterosis was observed in 6 traits for one hybrid cross and 15 traits for the other.
Conclusions:
- Subspecies differences in skeletal morphology are primarily genetic, not environmental.
- Saddle-back tamarin subspecies represent geographically isolated populations with differing gene frequencies and directional dominance for skeletal traits.