|SREL Reprint #1119|
Reproductive Strategies, and the Maintenance of Genetic Variability in
Mosquitofish (Gambusia affinis)
W. Robbins, Gregory D. Hartman and Michael H. Smith
Sperm storage and multiple inseminations were
documented in Gambusia affinis from a natural population and by
experimental matings using genetic markers.
There was unequal paternal contribution from new and recent matings
although sperm stored from previous matings continued to be represented in
subsequent broods. Analysis of
demographic characteristics of mosquitofish residing in and dispersing from an
area of high density showed that 76% of the dispersing individuals were adult
females, and 46% of these were in the later stages of reproduction.
The high levels of genetic variation found in this species would not be
predicted from the population characteristics but can be explained by dispersal,
sperm retention, and multiple inseminations.
SREL Reprint #1119
Robbins, L.W., G.D. Hartman, and M.H. Smith. 1987. Dispersal, reproductive strategies, and the maintenance of genetic variability in mosquitofish (Gambusia affinis). Copeia 1987:156-164.