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What factors shape genetic diversity in cetaceans?
Felicia Vachon1, Hal Whitehead1, Timothy R Frasier2
1Department of Biology Dalhousie University Halifax NS Canada.
Ecology and Evolution
|February 14, 2018
Summary
Cetacean genetic diversity is complex. Nuclear DNA diversity links to population size and habitat, while mitochondrial DNA diversity relates to range and social structure, not population size.
Area of Science:
- Marine Biology
- Evolutionary Genetics
- Conservation Biology
Background:
- Understanding genetic diversity is key for demography and evolutionary potential.
- Cetacean genetic diversity is complex due to long lifespans, generation times, social structures, and ranges.
Purpose of the Study:
- Assess factors influencing genetic diversity in cetaceans.
- Investigate relationships between species characteristics and genetic diversity using microsatellite and mitochondrial DNA.
Main Methods:
- Systematic literature review of microsatellite and mitochondrial DNA data.
- Analysis of 42 cetacean species.
- Phylogenetic methods and linear models to test influencing factors.
Main Results:
- Relative nuclear diversity correlates with population size and habitat type (neritic vs. oceanic).
- Mitochondrial DNA diversity is not correlated with population size.
- Mitochondrial DNA diversity is influenced by species' range and social structure.
Conclusions:
- Factors beyond population size significantly influence cetacean genetic diversity.
- Mitochondrial DNA may be less reliable for inferring historical demography than previously assumed.
- Consideration of range and social structure is crucial for interpreting cetacean genetic diversity patterns.
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