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Sex Determiners and Speciation in the Genus Chironomus

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Title: Sex Determiners and Speciation in the Genus Chironomus
Authors: Martin, Jon
Lee, BTO
Issue Date: 1988
Publisher: University of Hawaii Press
Citation: Martin J, Lee BTO. 1988. Sex determiners and speciation in the genus Chironomus. Pac Sci 42(1-2): 51-55.
Abstract: In a group of closely related Australian Chironomus species, the
position of the sex-determining region is variable, not only in different species
(or forms) but , in at least one case, also within the same form. This has raised
a number of questions regarding the nature of sex determination and the
relevance of variable sex determiners to speciation: (I) Is the sex-determiner
location altered by mutation at different steps in a genetic pathway or by translocation
(e.g., as a transposable element)? (2) Do polymorphisms for sexdeterminer
location exist, or do the apparent polymorphisms result from the
existence of cryptic species? (3) Are changes in the location of the functional
sex determiner a major component of speciation in this group? This paper
considers mainly the third question. A model of speciation involving the sex
determiner, compatible with either allopatry or sympatry, is proposed. Comparisons
are made with other groups, both invertebrate and vertebrate, which
appear to have a similar variable sex-determiner location.
ISSN: 0030-8870
Appears in Collections:Pacific Science Volume 42, Numbers 1-2, 1988

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