Record Display for the EPA National Library Catalog


Main Title Use of 'Thalassia' and Its Epiphytes for Toxicity Assessment: Effects of a Drilling Fluid and Tributyltin.
Author Macauley, J. M. ; Clark, J. R. ; Pitts, A. R. ;
CORP Author Environmental Research Lab., Gulf Breeze, FL. ;University of West Florida, Pensacola.
Publisher c1990
Year Published 1990
Report Number EPA/600/J-90/380;
Stock Number PB91-163931
Additional Subjects Environmental monitoring ; Sea grasses ; Water pollution effects(Plants) ; Tributyltin ; Drilling fluids ; Chlorophyll ; Graphs(Charts) ; Leaves(Botany) ; Reprints ; Thalassia testudium ; Epiphytes
Library Call Number Additional Info Location Last
NTIS  PB91-163931 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 14p
Concurrent 12-week laboratory and field studies were conducted to determine toxicity of the suspended particulate phase (SPP) of drilling fluid to Thalassia testudinum and its epiphytes. Test systems were treated once per week to achieve nominal concentrations of 100 mg/L SPP. Chlorophyll content of Thalassia leaves and epiphyte biomass and chlorophyll content were monitored during each test. Laboratory exposures were conducted in 7-L, flow-through (7 L/h) microcosms consisting of Plexiglas cylinders containing intact cores of Thalassia from a local seagrass bed. Field exposures were conducted in water-tight plexiglas chambers (2 m x 2 m x 1.5 m) placed over test plots in a seagrass bed for 24 h during SPP additions. Epiphyte biomass was reduced after 6 weeks of intermittent exposure to SPP in laboratory and field tests. After 12 weeks, epiphyte biomass had increased to densities similar to control values.