The ecotoxic effects of atrazine on aquatic ecosystems: An assessment of direct and indirect effects using structural equation modeling
Huggins, DG; Johnson, ML; deNoyelles, F, Jr
HERO ID
11145446
Reference Type
Book/Book Chapter
Year
1994
Language
English
| HERO ID | 11145446 |
|---|---|
| Year | 1994 |
| Title | The ecotoxic effects of atrazine on aquatic ecosystems: An assessment of direct and indirect effects using structural equation modeling |
| Book Title | Aquatic mesocosm studies in ecological risk assessment |
| Authors | Huggins, DG; Johnson, ML; deNoyelles, F, Jr |
| Editor | Graney, RL; Kennedy, JH; Rodgers, JH, Jr |
| Publisher Text | Lewis Publishers |
| City | Boca Raton, FL |
| Volume | N/A |
| Page Numbers | 653-692 |
| Abstract | The ecotoxic effects of atrazine (0, 20, 100, and 500 (xg/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. |
| Wosid | BCI:BCI199497114237 |
| Is Certified Translation | No |
| Dupe Override | No |
| Conference Location | Arlington, VA |
| Series | SETAC special publications series |
| Conference Name | Symposium on Utilization of Simulated Field Studies in Aquatic Ecological Risk Assessment at the 11th Annual Meeting of the Society of Environmental Toxicology and Chemistry |
| Conference Date | November 11-15, 1990 |
| Is Public | Yes |
| Language Text | English |
| Relationship(s) |
|