Concurrent Sessions Fisheries 1. Spatial Heterogeneity of Metabolism in the Kansas River. Anne Schechner and Walter Dodds. Kansas St. University, 108 Bushnell Hall, Manhattan, KS 66506 |
[email protected] River metabolism is a functional indicator consisting of the balance of Gross Primary Production (photosynthetic carbon fixation), Ecosystem Respiration (carbon oxidation), and their balance, Net Ecosystem Production. Estimating these rates allows us to examine total biological activity and reliance of the food web on external versus internal carbon sources. Gage point-measures over short time periods are generally used to assess metabolism, but they cannot encompass the variability of such a shifting and large river, so we sought to identify controls on rates of metabolism as varied with flood stage, location, and upstream geomorphology. We used a year (over flood and drought extremes) of dissolved oxygen data at three locations on the Kansas River in conjunction with bathymetry transects and USGS discharge and gage height data in order to estimate rates of river metabolism, link them to different flow regimes, and evaluate the degree of heterogeneity over the study area. We anticipated muted seasonal cycles of rates of metabolism due to flow control and the Kansas climate. Initial findings point to seasonal patterns of net ecosystem production, and confirmed hypothesized net heterotrophy. 2. A Case Study and Characteristics of the Blue Catfish Population and Fishery at Milford Reservoir, Kansas. Brett Miller, John Reinke, Ely Sprenkle, Ben Neely, and Jeff Koch. Kansas Department of Wildlife, Parks, and Tourism, 1782 10th Road, Clay Center, KS 67432 | 785-461-5095 |
[email protected] Milford Reservoir is the largest impoundment in Kansas (6,556 surface ha) and supports several important sport fisheries, including Blue Catfish Ictalurus furcatus, that has developed into a nationally-recognized trophy fishery.