|SREL Reprint #1088|
Biochemical Genetics of Mosquitofish. V. Perturbation
Effects on Genetic Organization of Populations
K. Kennedy, Michael L. Kennedy, Earl G. Zimmerman, Ronald K. Chesser and Michael
Biochemical variation encoded by six loci was
assessed for mosquitofish (Gambusia affinis) from 19 sites within
a stream altered by water level reduction.
Sites included temporary (isolated and non-isolated) pools and a main
stream area. Populations exhibited
significant genetic differentiation at two loci (isocitrate dehydrogenase-1 and
phosphoglucomutase-2) and a significant association between demographic and
genetic characters and geographic distance was indicated.
Relationships between demographic and genetic characters and between
reproductive and genetic characters were minimal.
Genetic differences were generally greater between juveniles and adults
than between adult males and females. Patterns
of allele distribution among sites were different for each adult group and
juveniles, with only juveniles exhibiting a relationship between allele
frequencies and geographic distance. Juveniles
from sites in closer proximity were more similar, probably reflecting juvenile
behavior rather than parental associations.
Population substructure seems to be maintained during population
disruption and colonization events.
SREL Reprint #1088
Kennedy, P.K., M.L. Kennedy, E.G. Zimmerman, R.K.
Chesser, and M.H. Smith. 1986. Biochemical genetics of mosquitofish. V. Perturbation effects on genetic organization of
populations. Copeia 1986:937-945.