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Occurrence of Allocreadium neotenicum in Aquatic Hosts from Northern Indiana

Joseph W. Camp
The American Midland Naturalist
Vol. 128, No. 1 (Jul., 1992), pp. 203-208
DOI: 10.2307/2426426
Stable URL: http://www.jstor.org/stable/2426426
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Occurrence of Allocreadium neotenicum in Aquatic Hosts from Northern Indiana
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Abstract

Allocreadium neotenicum (Trematoda: Allocreadiidae) was studied in aquatic hosts from a northern Indiana creek. Allocreadium neotenicum from this study exhibited morphological variations compared with the original specimens of A. neotenicum described by Peters (1957). These differences were probably attributable to differences in host species and differences in specimen preparation. Isopods, Caecidotea forbesi (Isopoda: Asellidae), and clams, Pisidium sp. (Pelecypoda: Sphaeriidae), were the definitive and intermediate hosts, respectively. Peak levels of prevalence and abundance of A. neotenicum occurred from autumn through early spring in the isopods. The lowest levels of infection occurred during the summer. The prevalence of immature worms in isopods decreased from summer through spring. During the same time the prevalence of gravid worms increased. Factors which affected the seasonal changes include influx of a new cohort of uninfected isopods during the summer and autumn, death of older infected isopods during the spring and summer, cercarial shedding from clams during summer and autumn and maturation of A. neotenicum. Experimental infections were performed to verify that the cercaria shed by the clams was A. neotenicum. Male isopods had higher prevalence and abundance of infection than did females.

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