Accession Number : ADA307420

Title :   Evaluation of a Myriophyllum Spicatum Decline in Reservoirs of the Tennessee and Cumberland Rivers.

Descriptive Note : Final rept.,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB

Personal Author(s) : Smith, Craig S. ; Barko, John W.

PDF Url : ADA307420

Report Date : APR 1996

Pagination or Media Count : 20

Abstract : From 1989 through 1991, Myriophyllum spicatum (Eurasian watermilfoil) and other submersed macrophyte species declined markedly in many locations within reservoirs of the Tennessee and Cumberland rivers. Environmental characteristics and vegetation cover histories were compared for locations in which plants declined, declined and then recovered, or remained stable. Sediment samples from these locations were planted with M. spicatum, and plants were grown under standard conditions. Sediments from decline and nondecline areas did not differ significantly in their ability to support M. spicatum growth. Of the environmental and sediment characteristics measured, only light availability (calculated as Secchi depth/water depth) differed significantly between decline and nondecline sites. Recovery of M. spicatum populations by 1993 in many decline sites suggests that these declines were short-term phenomena, probably resulting from climatic conditions during 1989-1991. If declines resulting from sediment-related mechanisms occur, they are likely to be long lasting and localized.

Descriptors :   *PLANT GROWTH, *PATHOGENIC MICROORGANISMS, *RESERVOIRS, *PLANTS(BOTANY), RECOVERY, ENVIRONMENTS, WATER, LIGHT, DEPTH, SHORT RANGE(TIME), AVAILABILITY, SAMPLING, CLIMATE, RIVERS, TENNESSEE, SEDIMENTS, PLANT PATHOLOGY.

Subject Categories : Biology
      Medicine and Medical Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE