NDLI: Trophic status of Missouri River floodplanin lakes in relation to basin type and connectivity

Content Provider	Springer Nature Link
Author	Knowlton, Matthew F. Jones, John R.
Copyright Year	1997
Abstract	Limnological data were collected over a two-year period from 12 lakes in the Missouri River floodplain in order to evaluate lake trophic status and the influence of basin type and connectivity on nutrient, seston, and phytoplankton dynamics. The lakes were located in west-central Missouri and included eight scour basins formed by levee breaks during a 1993 flood and four older oxbow lakes. The Missouri River was also sampled. Five of the scour basins (connected scours) were inundated by the Missouri River for varying periods during the study. The other lakes (protected lakes) were hydrologically isolated from the river by levees. On the basis of mean total phosphorus (TP-61-282 μg/L), mean total nitrogen (TN-0.7-2.1 mg/L), mean chlorophyll (CHL-22-67 μg/L), and mean suspended solids (TSS-16-93 mg/L), all 12 sites were highly eutrophic compared to other lakes in Missouri. Nutrient fractions and seston composition indicated dominance of inorganic nutrients and abiotic seston in the riverine lakes. Maximum concentrations of nutrients and TSS occurred in oxbow lakes during periods of sediment resuspension and in connected scours during floods in spring 1995 and 1996 when connected sites were inundated by the Missouri River. Algal blooms with peak CHL>200 μg/L occurred sporadically in the oxbow lakes. Similarly large blooms (peak CHL 81–689 μg/L) occurred in connected scours when low river levels reduced exchange with the river. Reduced connectivity was accompanied by rapid loss of dissolved N and P fractions, especially nitrate. Protected scours had lower average TP, TN, and TSS than the other sites and were less temporally variable.
Starting Page	468
Ending Page	475
Page Count	8
File Format	PDF
ISSN	02775212
Journal	Wetlands
Volume Number	17
Issue Number	4
e-ISSN	19436246
Language	English
Publisher	Springer Netherlands
Publisher Date	1997-01-01
Publisher Institution	Society of Wetland Scientists
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Missouri River floodplain lakes oxbows scour basins limnology nutrients chlorophyll suspended solids connectivity 1993 flood Freshwater & Marine Ecology Environmental Management Ecology Hydrogeology Coastal Sciences Landscape Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry

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