NDLI: The Ecotoxic Effects of Atrazine on Aquatic Ecosystems: An Assessment of Direct and Indirect Effects Using Structural Equation Modeling

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The Ecotoxic Effects of Atrazine on Aquatic Ecosystems: An Assessment of Direct and Indirect Effects Using Structural Equation Modeling

Content Provider	Scilit
Author	Huggins, Donald G. Johnson, Michael L. Denoyelles, Frank
Copyright Year	2020
Description	The ecotoxic effects of atrazine (0, 20, 100, and 500 μg/l exposure rates) on experimental pond mesocosm ecosystems were evaluated after 805 days of continuous exposure. Analysis of data was done using LISREL, a structural equation modeling technique. A series of five ecosystem models were developed with LISREL with each model including a unique subset of macroinvertebrate concepts. All models identified both direct and indirect effects of the exogenous concepts (grass carp, pond depth, and atrazine) on all endogenous concepts (i.e., fish, aquatic vegetation, phytoplankton, zooplankton, and macroinvertebrate concepts). All models quantify the ecotoxic effects (direct and indirect) of atrazine on the various endogenous concepts (structural units of these ecosystems) by specifying the functional paths that connect them. Direct ecotoxic effects of atrazine were primarily limited to reductions in gizzard shad biomass and aquatic vegetation abundance (% cover). Most indirect effects associated with atrazine exposure were initiated by atrazine's direct effect on the aquatic plant community. Measures of the direct, indirect, and total effects of atrazine on affected endogenous concepts are provided and the ecological consequences of these effects are discussed. Book Name: AQUATIC MESOCOSM STUDIES in ECOLOGICAL RISK ASSESSMENT
Related Links	https://content.taylorfrancis.com/books/download?dac=C2006-0-06745-6&isbn=9781003070016&doi=10.1201/9781003070016-39&format=pdf
Ending Page	692
Page Count	40
Starting Page	653
DOI	10.1201/9781003070016-39
Language	English
Publisher	Informa UK Limited
Publisher Date	2020-10-25
Access Restriction	Open
Subject Keyword	Book Name: Aquatic Mesocosm Studies in Ecological Risk Assessment Environmental Engineering Models Indirect Effects Structural Aquatic Ecotoxic Effects of Atrazine
Content Type	Text
Resource Type	Chapter

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