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CONFERENCE SCHEDULE UPDATES & CHANGES: As a result of the prolonged government shutdown, we experienced a number of cancellations and changes to the schedule. Cancellations and changes are listed here (as of January 26, 2019). 
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Monday, January 28 • 1:40pm - 2:00pm
(FISHERIES: RIVERS & STREAMS) Seasonal Use of Riffles, Lateral Pools, and Non-Wadeable Deep Pools by Fishes in the Neosho River, Kansas

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AUTHORS: Sam Schneider, David Edds – Emporia State University

ABSTRACT: Lotic ecosystems are characterized by riffle–pool mesohabitats that support discrete fish assemblages. Most previous mesohabitat studies on fishes have focused on riffles and wadeable pools in small streams, and only recently have non-wadeable, deep pool mesohabitats been examined. Previous research suggests that deep pools are vital seasonal refugia for various fish species during times of adverse physicochemical conditions, yet the deep pool fish assemblage is often not sampled during all seasons, especially winter. We are comparing fish abundance and species richness at the mesohabitat scale in riffles, shallow lateral pools, and non-wadeable deep pools in the Neosho River, Kansas, and are examining relationships between fish abundance, species richness, water temperature, dissolved oxygen, and season, with emphasis on investigating possible seasonal use of deep-pool refugia. We are using a Siamese trawl to sample these three mesohabitat types monthly at nine sites. Summer results suggest that mesohabitats are discrete depending, however, on whether catch is analyzed by m<sup>2 </sup>or m<sup>3</sup>. Riffles contain more fish per m<sup>3</sup> and more fish species per m<sup>3</sup>, but shallow lateral pools contain more species per m<sup>2</sup>. This research will provide insight on seasonal mesohabitat use and the importance of seasonal deep pool refugia in warmwater rivers of the Midwest.

Monday January 28, 2019 1:40pm - 2:00pm EST