MALE INSEMINATIVE POTENTIAL IN APHYTIS LINGNANENSIS (HYMENOPTERA: APHELINIDAE)

1 June 1976

journal article
research article
Published by Cambridge University Press (CUP) in The Canadian Entomologist

Vol. 108 (6) , 583-589
https://doi.org/10.4039/ent108583-6

Abstract

Experiments were conducted to determine the number of females a single male Aphytis lingnanensis Compere (Hymenoptera: Chalcidoidea) would inseminate during the course of a lifetime and the number of female progenies stemming from these copulations. Comparisons between a 25-year-old laboratory culture and a newly collected field culture of the same species indicated that reproductive effort on the part of males was similar for the two cultures. The mean total number of females copulated by an individual male during this lifetime (about 6 days) was 27.6 for the laboratory culture and 25.6 for the field culture. The mean total number of female progeny per individual male resulting from these copulations was 169.5 for the laboratory culture and 149.1 for the field culture. Males inseminated the most females on the first day of adult life. Number of copulations and inseminative ability decreased rapidly through day 4. Very few occurred during days 5 to 9, the ultimate day any occurred. Females inseminated by a male that had experienced coitus with several females earlier tended to produce more males, thus suggesting that fewer spermatozoa were transferred during later copulations.

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