Abstract:
:Genetic diversity among laboratory and field populations of Chironomus riparius was investigated using microsatellite DNA analysis. Individuals of midge cultures reared in 10 different laboratories showed a clear reduction in the number of alleles per locus and in the level of heterozygosity compared to two natural populations sampled in southern Germany. To reconstruct the rate of genetic impoverishment under laboratory conditions, genetic diversity was monitored in a C. riparius laboratory population for 23 generations. Additionally, 11 populations originating from different laboratories were crossed, and genetic diversity was compared among pure, crossed, and natural populations. The results demonstrate that C. riparius strains used in standard toxicity tests exhibit low levels of genetic variability. In addition, our experiments show that refreshment of stocks with individuals from other laboratories is not sufficient to restore genetic variation. Potential consequences of genetic impoverishment and improvements for toxicological bioassays are discussed.
journal_name
Environ Toxicol Chemjournal_title
Environmental toxicology and chemistryauthors
Nowak C,Vogt C,Diogo JB,Schwenk Kdoi
10.1897/06-349r.1subject
Has Abstractpub_date
2007-05-01 00:00:00pages
1018-22issue
5eissn
0730-7268issn
1552-8618journal_volume
26pub_type
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