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Wednesday, January 27 • 10:20am - 10:40am
Analysis of Parasite Community Structure Within Mallards Anas Platyrhynchos Collected At Lake Winnibigoshish, Minnesota During Spring and Fall Migration

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AUTHORS: Holly Bloom,* Robert Sorensen – Minnesota State University, Mankato

ABSTRACT: Gathering baseline information on the parasites within a host species, at specified locations and times, is important for knowing what “normal” looks like within a host population. This data provides a comparison for future studies. We collected gastrointestinal tracts from 21 mallards Anas platyrhynchos at a northern Minnesota lake during migrations in fall 2012 and spring 2013. Gastrointestinal parasites were identified and quantified. Four classes of helminths were identified and varying parasite infrapopulations and metapopulations were observed among individual birds and well as different seasons. Birds collected in the spring harbored only 5.9% of the total parasites found. Fall birds harbored 12 trematode species, while spring birds harbored 8. Only one species of trematode, Echinoparyphium recurvatum, was found in the spring that was not present in the fall. In fall birds, Psilotrema mediopora were the most abundant while Echinostoma sp. were the most abundant in the spring. The exotic trematode P. mediopora was observed within several birds during this study. This helminth has not been documented in the United States previously. This helminth along with Sphaeridiotrema pseudoglobulus and Cyathocotyle bushiensis use the exotic faucet snail, Bithynia tentaculata as an intermediate host. The range expansion of B. tentaculata could allow for native populations of these exotic trematodes to form. Collecting baseline data can provide evidence for novel and current trematode populations along with indication for potential mortality events.

Wednesday January 27, 2016 10:20am - 10:40am EST