摘要：Observations were made over a three-year period (1949-51) on the occurrence of peaks and depressions in the housefly population of Talbia, a small village in a rural district near Cairo. The results, illustrated by eight figures, are based on counts of flies collected on wooden grids placed at selected sites. Two peaks and two depressions occur annually—in spring and autumn, and at midsummer and in winter, respectively. These fluctuations in fly population appear to be associated with changes in temperature, although a certain irregularity in the findings suggests that some other factor—such as the number of manure heaps accumulated at various times of the year—may be involved. Temperature also affects the concentration of flies at indoor and outdoor haunts; an increase above 23.5°C tends to drive them indoors. There is no indication that humidity influences the density of fly populations. Full text Full text is available as a scanned copy of the original print version. Get a printable copy (PDF file) of the complete article (457K), or click on a page image below to browse page by page. Links to PubMed are also available for Selected References . 513 514 515 516 517 518 519
