A long-term study on the population biology of Crepidostomum cooperi ( Trematoda: Allocreadidae) in the burrowing mayfly, Hexagenia limbata ( Ephemeroptera).

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A 16-yr study considered aspects of the population biology of Crepidostomum cooperi in Hexagenia limbata at Gull Lake, lower Michigan. Prevalence of C. cooperi metacercariae was, except for one period of 2 consecutive years, significantly higher in female subimagoes. Prevalence in male mayflies varied between 75-90% in all but 4 yr; among females it was >90% in all but 3 yr. Densities of metacercariae were consistently higher in female mayflies. Prevalence and abundance of C. cooperi in mayfly nymphs was higher in shallow parts of the littoral zone (3 m) than at 5 or 7 m. The pattern of distribution of the parasite in mayfly nymphs and subimagoes is believed to be related to the eutrophication which has occurred in the lake during the past 15-20 yr. -from Authors

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American Midland Naturalist

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