Abstract
Hassell and Huffaker1 demonstrated some density-dependent regulation of numbers in populations of the flour moth, Anagasta kuehniella (Zeller). Fighting between newly hatched larvae2 contributes to the regulation of numbers in this species but is not the only controlling mechanism: Smith3 showed that crowding from the end of the first instar onwards led to delayed emergence of adults and a reduction in body weight. Since smaller moths lay few eggs4, both these effects would contribute to the density-dependent regulation of numbers in succeeding generations. I describe here a mechanism which could bring about these effects. I suggest that last-instar larvae of A. kuehniella, when they meet, deposit on the substratum drops of secretion from their mandibular glands; and that the response of other last-instar larvae to this secretion results not only in the regulation of the total numbers of A. kuehniella in a finite system (as studied by Smith3), but also in the control of the dispersion of individuals within that system.
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References
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CORBET, S. Mandibular Gland Secretion of Larvae of the Flour Moth, Anagasta kuehniella, contains an Epideictic Pheromone and elicits Oviposition Movements in a Hymenopteran Parasite. Nature 232, 481–484 (1971). https://doi.org/10.1038/232481b0
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DOI: https://doi.org/10.1038/232481b0
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