EXACT AGE-DETERMINATION IN LABORATORY AND FIELD-CAUGHT DROSOPHILA
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abstract
A method to prepare and count daily growth layers in internal thoracic muscle attachments is described. Growth layers have been observed in five species in the laboratory and in five field-caught species-including Drosophila melanogaster and D. pseudoobscura. The growth layers do not vary with the genetic make up of individuals within a species, and are comparable between individuals of different species. However, a daily temperature cycle is required for the production of strong layers in laboratory stocks. 1982.