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    Author(s): Constance I. Millar; Bohun B. Kinloch; Robert D. Westfall
    Date: 1992
    Source: Proceedings of a symposium presented by the California Sugar Pine Management Committee, March 30-April 1, University of California Davis, 11 p.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (1.7 MB)

    Description

    Genetic diversity in sugar plne will be severely reduced by the blister rust pandemic predicted within the next 50 to 75 years. We model effects of the epidemic on genetic diversity at the stand and landscape levels for both natural and artificial regeneration. In natural stands, because natural frequencies of the dominant gene (R) for resistance are low, the most obvious effect on sugar pine will be demographic, with a crash in population size expected following disease onset. Many stands in areas of lowest R frequency may lose the allele during the initial epidemic and go extinct. In stands that maintain the resistance allele, R will increase in frequency under strong setection in subsequent generatior, and population sizes in these stands should recover.

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    Citation

    Millar, Constance I.; Kinloch, Bohun B., Jr.; Westfall, Robert D. 1992. Conservation of biodiversity in sugar pine: effects of the blister rust epidemic on genetic diversity. Proceedings of a symposium presented by the California Sugar Pine Management Committee, March 30-April 1, University of California Davis, 11 p.

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