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Monday, February 6 • 2:00pm - 2:20pm
Technical Session. Identification and Prioritization of Factors Limiting Reintroduced Plains Topminnow (Fundulus sciadicus) Populations in Nebraska Streams

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AUTHORS: Joseph D. Thiessen, University of Nebraska Kearney (UNK), Keith D. Koupal, Nebraska Game and Parks Commission, Casey W. Schoenebeck Minnesota Department of Natural Resources, Julie J. Shaffer, UNK

ABSTRACT: The Plains topminnow, Fundulus sciadicus, is an endemic Great Plains stream fish that has experienced reductions in range and abundance, resulting in regional protection and federal listing considerations. In response, the Nebraska Natural Legacy Project, Game and Parks Commission, and the University of Nebraska at Kearney have proactively begun translocation efforts to reestablish and augment populations throughout the state. The project focus is to assess the persistence of reintroduced and augmented Plains topminnow populations using PRESENCE software likelihood of occurrence >0.50. Translocation efforts of 17 stocking sites (8 long-term, 9 short- term) were revisited to determine long-term population reestablishment success. Sites that were not successful were augmented with a second stocking event and revisited a year later. Limiting factors of Plains topminnow populations were identified comparing catch rates and a suite of abiotic and biotic variables using an information theoretic approach. We found Plains topminnow abundances to have a negative relationship with predator abundance, percent of channel habitat, and stream entrenchment, and positive relationships with stream temperature, sinuosity, and percent of backwater pool habitat; with our best fit AICc model including predator abundance and stream temperature.

Monday February 6, 2017 2:00pm - 2:20pm CST
Grand Ballroom F