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Wednesday, January 27 • 11:00am - 11:20am
The Identification of The Exotic Waterfowl Trematode Psilotrema Mediopora (Trematoda: Psilostomatidae) In United States For The First Time Using Morphological and Molecular Data

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AUTHORS: Tyler Achatz*, Minnesota State University - Mankato; Dr. Robert Sorensen, Minnesota State University - Mankato

ABSTRACT: This study examined the intestines of hunter-shot Fulica americana, Aix sponsa, Aythya collaris, Aythya affinis, Anas discors, and Anas platyrhynchos from Lake Winnibigoshish, Minnesota from fall 2012 and spring 2013. Intestines were extracted and frozen until used. Each intestine was examined for all trematodes using a dissecting microscope. All examined birds, except F. americana, were found to host P. mediopora, with large populations of P. mediopora being located in the anterior small intestine with decreasing numbers being found in posterior regions. P. mediopora was originally described in Anas platyrhynchos and Anas clypeata from Northern Eurasia by P. G. Oschmarin in 1963. Of the P. mediopora found, 11, 2, 129, 212 and 92 individual specimens from A. sponsa, A. collaris, A. affinis, A. discors, and A. platyrhynchos were stained using Semichon’s acetocarmine and examined using light microscopy, respectively. P. mediopora were sequenced using partial 28s rDNA sequences to validate the placement within the genus of Psilotrema. When our specimens were compared to Oschmarin’s description several size variations were detected. Gross morphology matched variation seen in the original description such as the variable location of the ovary. However, additional morphological variation was noted including the presence of up to 9 eggs in some specimens. The 28s DNA sequence obtained supported the placement of the samples examined within the genus Psilotrema. The life cycle of P. mediopora requires the exotic snail Bithynia tentaculata as a first intermediate host, which has been found relatively recently in the Midwestern United States. These results suggest that the expansion of the range for B. tentaculata snails offers the potential for the establishment of this novel, exotic trematode.

Wednesday January 27, 2016 11:00am - 11:20am EST

Attendees (5)