Accession Number : ADA323663

Title :   Growth of Selected Fishes in Navigation Pool 8 of the Upper Mississippi River: A Test of the Flood-Pulse Concept.

Descriptive Note : Master's thesis,

Corporate Author : WISCONSIN UNIV-LA CROSSE

Personal Author(s) : Bartels, Andrew D.

PDF Url : ADA323663

Report Date : DEC 1995

Pagination or Media Count : 96

Abstract : Size-specific growth of bluegill, black crappie, and freshwater drum was significantly different over four years in Navigation Pool 8 of the upper Mississippi River. Differences in growth were positively related to annual hydrographs for bluegill but less related to hydrographs for black crappie and freshwater drum. These results are consistent with predictions of the Flood Pulse Concept. Extensions of analysis of covariance (ANCOVA) models were used to account for differences in growth due to the size of fish and tested for annual differences in growth rates. Planned comparisons examined differences in growth among years with a large flood event, two years of normal hydrology, and a drought. Some sizes of bluegill and freshwater drum, but not black crappie, grew significantly faster during the flood year than during years of normal flow. Some sizes of bluegill and black crappie grew slower during the drought year when freshwater drum were not sampled. Growth curves for bluegill and black crappie indicate that the magnitude of the effects on growth rate was greater for the drought year than for the flood year. Differences in growth rate among years were most apparent for bluegill from 50 - 100 mm, black crappie greater than 200 mm, and drum longer than 100 mm. These data suggest that (1) patterns in growth for some riverine fishes are consistent with the Flood Pulse Concept, (2) droughts may be of greater consequence than floods to riverine communities, and (3) growth responses related to hydrology arc size- and species-specific.

Descriptors :   *ECOSYSTEMS, *FISHES, *AQUATIC BIOLOGY, *GROWTH(PHYSIOLOGY), COMMUNITIES, ANALYSIS OF VARIANCE, HYDROLOGY, COVARIANCE, FLOODS, HYDROGRAPHY, MISSISSIPPI RIVER, DROUGHT.

Subject Categories : Biology
      Ecology
      Hydrology, Limnology and Potamology

Distribution Statement : APPROVED FOR PUBLIC RELEASE