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Monday, February 6 • 2:20pm - 2:40pm
Symposia Session - S3: Ecology of the Missouri National Recreational River. Nutrients and Dissolved Oxygen Monitoring in the 59-mile Missouri National Recreational River Below Gavins Point Dam

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AUTHORS: Brenda Densmore, Justin Krahulik - U..S Geological Survey

ABSTRACT: The 59-mile reach of Missouri River below Gavins Point Dam is part of the Missouri National Recreational River.  Even though this section of river is not channelized, the natural form and hydrology are affected by the operation of upstream dams.  The reach may be impaired from the low allochthonous input of organic matter and nutrients from upstream because of river disconnect created by dams and further impaired following the 2011 flood.  The U.S. Geological Survey collected samples in both 2015 and 2016 at multiple locations within the reach. In October 2015, water samples were collected and analyzed for nutrients at three sites within the 59-mile reach and at two tributaries.  In June, July, and August 2016 water samples were collected at seven sites and analyzed for nutrients and chlorophyll.  The seven sites consisted of three main channel sites, two backwater sites, and two sandbar sites.  Dissolved oxygen was monitored at the sandbar and backwater sites to determine diurnal oxygen patterns.  Primary production was also measured using the light and dark bottle method at the sandbar and backwater sites.  Other previously collected datasets with similar data for the reach were acquired to compare to data collected for this study.

Monday February 6, 2017 2:20pm - 2:40pm CST
Grand Ballroom A

Attendees (3)