Senior Project Advisor

Landis, Wayne G.

Document Type

Project

Publication Date

Spring 2013

Keywords

Herbicide, Chemical runoff, Chemical mixtures

Abstract

Herbicide use in agricultural systems often causes runoff to contain chemical mixtures that may have greater deleterious effects on non-target organisms than the same chemicals would have when found alone. Little information is known about how some of these chemicals act in mixtures, though many of their individual effects have been described. It is important to understand what effects these chemical mixtures have to identify protective application levels. In this experiment, a 21-day chronic Daphnia magna toxicity test was conducted using an atrazine and Roundup® mixture. Five concentrations of atrazine were tested (0.4, 0.8, 1.2, 1.6, 2.0mg/L). The mixture treatments contained the same concentrations of atrazine with a constant concentration of Roundup® (450mg/L, 2% glyphosate ). A spike in reproduction was observed at the lowest concentration of atrazine (0.4mg/L), with a subsequent decrease in reproduction with increasing concentration of atrazine. In the mixture the Roundup® control caused significantly reduced reproduction in the D. magna, though the combination of atrazine and Roundup® resulted in increased reproduction. Log linear regression analysis was used to predict overall trends in the treatments.

Department

Environmental Sciences

Subjects - Topical (LCSH)

Herbicides--Toxicology; Atrazine; Glyphosate; Runoff; Daphnia magna--Effect of chemicals on

Genre/Form

student projects; term papers

Type

Text

Rights

Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this document for commercial purposes, or for financial gain, shall not be allowed without the author’s written permission.

Rights Statement

http://rightsstatements.org/vocab/InC/1.0/

Language

English

Format

application/pdf

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