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    Investigating the Parasitism of Southern California Bean Clams (Donax gouldii) by the Trematode Postmonorchis donacis

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    Subject
    Parasitism; Donax gouldii; Postmonorchis donacis
    Author
    Winter, R N.; Hatch, M.B. A.
    Journal Title
    Scas: Bulletin of the Southern California Academy of Sciences
    Issue
    scas/vol109/iss3; 3
    Metadata
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    URI
    https://scholar.oxy.edu/handle/20.500.12711/9583
    Abstract
    The bean clam, Donax gouldii, is an intermediate host of the monorchid trematode Postmonorchis donacis. Bean clams were collected from nine locations in San Diego County, CA, and siphons and mantle edges examined. Two hypotheses were tested: (1) parasitism increases with valve length, and (2) female clams have more parasites than males. A positive relationship was found between clam length and parasitism at all locations; there was no significant difference (a 5 0.05) in male and female parasitism rates. Spatial variation on a kilometer scale was observed in trematode infestation rate and intensity.
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