Accession Number : ADA141830

Title :   Aquatic Plant Control Research Program. Effects of Endothall Treatment on Phosphorus Concentration and Community Metabolism of Aquatic Communities.

Descriptive Note : Final rept.,

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

Personal Author(s) : James, W F

PDF Url : ADA141830

Report Date : Feb 1984

Pagination or Media Count : 87

Abstract : Herbicide treatment and macrophyte senescence may results in the recycling of phosphorus from aquatic weeds to nontarget species because the nutrient is rapidly leached from plant tissue. A field study and two microcosm experiments were conducted to examine changes in phosphorus, oxygen, and chlorophyll a concentrations after the application of the herbicide and endothall. In each microcosm experiment, Potamogeton crispus communities were housed in 57-lambda aquaria containing known standing crops of the test plant and sediment with a specific phosphorus-adsorbing capacity. In the first microcosm experiment, the application of 2.0 ppm endothall caused plant death and a rapid, short-term increase in soluble reactive phosphorus, presumably from excessive leaching during senescence. A second microcosm experiment, which employed six control and six experimentally treated systems, differed from microcosm experiment I in that the sediment used had a weak phosphorus-adsorbing capacity. In addition, the metabolism of the total microcosm and three autotrophic components (macrophyte-epiphyte, planktonic, and benthic) were monitored to assess the effects of an herbicide perturbation on nontarget assemblages.

Descriptors :   *ECOLOGY, *PHOSPHORUS, *HERBICIDES, AQUATIC WEEDS, LEACHING, METABOLISM, OXYGEN, DECOMPOSITION, RECYCLED MATERIALS, RATES

Subject Categories : Ecology
      Biochemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE