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A latitudinal cline in P–M gonadal dysgenesis potential in Australian Drosophila melanogaster populations
Published online by Cambridge University Press: 14 April 2009
Summary
Isofemale lines of Drosophila melanogaster from six localities along the east coast of Australia, spanning 2900 km and 26 degrees of latitude, were assayed for their gonadal dysgenesis characteristics in the P–M system of hybrid dysgenesis. A strong clinal pattern with latitude was discovered. From north to south, the first two populations were typical strong P populations, and the next population was moderate P. The next population to the south was neutral (Q), with some weak P and weak M characteristics. The two southernmost populations were typical M populations. Much variance in P activity in P populations and in susceptibility to P activity in M populations was detected among isofemale lines. This clinal pattern with latitude of the P–M system is paralleled by similar clinal patterns for frequencies of common cosmopolitan inversions and of certain allozymes in Australia. A model of introductions of flies with different characteristics in the north and south could account for the P–M clinal pattern, but cannot account for an intermediate Q population, nor establish the inversion and isoenzyme dines at the same time. Current models of transposable element population dynamics are limited to single population dynamics, and are therefore inadequate for these clinal data.
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- Copyright © Cambridge University Press 1987
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