| Autor: | Christopher R. Dahl, Jeffery K. Wickliffe, Thomas W. Custer, John W. Bickham |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Genetics
education.field_of_study Mutation rate Mitochondrial DNA Cytochrome b Health Toxicology and Mutagenesis Population Nycticorax Population genetics General Medicine Management Monitoring Policy and Law Biology Toxicology biology.organism_classification Population bottleneck Genetic variation education |
| Zdroj: | Ecotoxicology. 10:291-297 |
| ISSN: | 0963-9292 |
| DOI: | 10.1023/a:1016711401809 |
| Popis: | DNA sequence analysis of a 215 base-pair region of the mitochondrial cytochrome b gene was used to examine genetic variation and search for evidence of an increased mutation rate in black-crowned night-herons. We examined five populations exposed to environmental contamination (primarily PAHs and PCBs) and one reference population from the eastern U.S. There was no evidence of a high mutation rate even within populations previously shown to exhibit increased variation in DNA content among somatic cells as a result of petroleum exposure. Three haplotypes were observed among 99 individuals. The low level of variability could be evidence for a genetic bottleneck, or that cytochrome b is too conservative for use in population genetic studies of this species. With the exception of one population from Louisiana, pair-wise Phist estimates were very low, indicative of little population structure and potentially high rates of effective migration among populations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink