Abstract
The chromosomal polymorphism in three Danish lake populations of the midge Chironomus plumosus L. was followed during a period of nearly three years. The populations exhibited differences in the composition of the chromosomal polymorphism and in the level of heterozygosity (= number of inversion heterozygotes per individual). The frequencies of larvae with a certain paracentric inversion located in the largest of the chromosomes showed remarkable differences between the three populations. In one of the lakes, in addition to a large frequency of larvae with this inversion, specimens heterozygous for the inversion were in great excess compared to the Hardy-Weinberg distribution. The frequency of the heterozygote varied during the year. The adjustments of the chromosomal polymorphism to the environments are discussed.
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