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    Defining the Cytotype and Persistence Concepts in Black Flies (Diptera: Simuliidae)

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    Author
    Van Hoey, Jeanna
    Advisor
    Gerald Shields; Grant Hokit; Kyle Strode
    Date of Issue
    2012-04-01
    Subject Keywords
    Simulium arcticum, black flies
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    URI
    https://scholars.carroll.edu/handle/20.500.12647/2800
    Title
    Defining the Cytotype and Persistence Concepts in Black Flies (Diptera: Simuliidae)
    Type
    thesis
    Abstract
    Y-linked chromosomal inversions promote reproductive isolation in black flies. Time to fixation to total sex-linkage varies among incipient species. Persistence from year-to-year of chromosome types at any location is largely unstudied. Therefore, I analyzed the polytene chromosomes of a large sample (n = 800) of black fly larvae of the Simulium arcticum complex from the Little Blackfoot River (LBR) in western Montana to determine: 1) the extent of linkage of inversions to the Y chromosome and 2) persistence of taxa from year-to-year and compared these data to those of previous analyses, which were based on smaller sample sizes. I hypothesized that the large sample in 2011 would support previous observations. Thirteen Y chromosome types were described in 2011, whereas only nine types had been described previously. This study suggests that the IIL-10, IIL-18, IIL-38, and IIL-51 inversions are Y-linked at the LBR and that they chromosomally define cytotypes (taxa diverging from a common ancestor), which deserve more detailed study. Moreover, persistence was observed since all previous inversions, with the exception of IIL-30, IIL-35, and IIL-84 were found in 2011.
    Degree Awarded
    Bachelor's
    Semester
    Spring
    Department
    Life & Environmental Sciences
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    • Life and Environmental Sciences Undergraduate Theses

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