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):

Report Date:

1984-02-01

Pagination or Media Count:

87.0

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.

Subject Categories:

  • Ecology
  • Biochemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE