Male and Female Influence of Adult Individuals on Undifferentiated Larvae of the Parasitic Nematode Paramermis contorta

Abstract

PREVIOUS experimental infestations of Chironomus tentans larvae with the nematode Paramermis contorta confirmed that crowding plays a major part in determining the sex of the parasites1. Observations by Caullery and Comas2 on natural populations showed that an increase of the degree of infestation results in an increase of the relative frequency of the males of Paramermis. It was also established that, at a given degree of infestation, the relative frequency of male Paramermis decreases with the increasing lengths of the Chironomus larvae at the moment when they are penetrated by the nematode3.

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References

  1. 1

    Parenti, U., Arch. Zool., 47, 209 (1962).

  2. 2

    Caullery, M., and Comas, M., C. R. Acad. Sci., Paris, 186, 646 (1928).

  3. 3

    Parenti, U., Boll. Zool., 29, 453 (1962).

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PARENTI, U. Male and Female Influence of Adult Individuals on Undifferentiated Larvae of the Parasitic Nematode Paramermis contorta. Nature 207, 1105–1106 (1965). https://doi.org/10.1038/2071105b0

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