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Front cover: Background: Mature rice plants (Oryza sativa) in the Mermentau River Basin, southwestern Louisiana (Photograph by Dennis K. Demcheck, U.S. Geological Survey) Top left: Rice water weevil, adult (Lissorhoptrus oryzophilus) on rice stalk (Photograph provided by Kelly V. Tindall, Department of Entomology, Louisiana State University, Baton Rouge, Louisiana) Top right: Ground water for rice field irrigation in the Mermentau River Basin, southwestern Louisiana (Photograph by Dennis K. Demcheck, U.S. Geological Survey) Lower left: Rice water weevil, larva (Lissorhoptrus oryzophilus) on rice roots (Photograph provided by Kelly V. Tindall, Department of Entomology, Louisiana State University, Baton Rouge, Louisiana) Lower right: Hydropsychidae, larva, net-spinning caddisfly (Photograph provided by Elaine Esteban, Department of Biology, California State University, Chico, California)
Environmental Setting, Water Quality, and Ecological Indicators of Surface-Water Quality in the Mermentau River Basin, Southwestern Louisiana, 1998-2001 By Stanley C. Skrobialowski, Scott V. Mize, and Dennis K. Demcheck U.S. GEOLOGICAL SURVEY Water-Resources Investigations Report 03-4185 National Water-Quality Assessment Program Baton Rouge, Louisiana 2004
Page 1: National Water-Quality Assessment P
Page 5: FOREWORD The U.S. Geological Survey
Page 8 and 9: FIGURES 1-4. Maps showing: 1. Locat
Page 10 and 11: viii
Page 12 and 13: area and agricultural land-use inte
Page 14 and 15: 4 30° 30´ 30° 00´ 93° 00´ VER
Page 16 and 17: Table 1. Surface-water and ecologic
Page 18 and 19: 8 30° 00´ 30 ° 30´ 93° 00´ VE
Page 20 and 21: QUANTITY, IN MILLION GALLONS PER DA
Page 22 and 23: aquatic life is exposed to both gro
Page 24 and 25: were sampled monthly November 1998-
Page 26 and 27: Table 3. Drinking-water regulations
Page 28 and 29: and manganese were exceeded in surf
Page 30 and 31: the median concentration of total n
Page 32 and 33: Photograph by Dennis K. Demcheck, U
Page 34 and 35: Major Inorganic Ions and Trace Elem
Page 36 and 37: criteria for the protection of drin
Page 38 and 39: 28 CONCENTRATION, IN MICROGRAMS PER
Page 40 and 41: ank stability at Tortue and the red
Page 42 and 43: Table 9. Median aquatic invertebrat
Page 44 and 45: habitat conditions associated with
Page 47 and 48: invertebrate species in relation to
Page 49 and 50: Table 13. Median aquatic invertebra
Page 51 and 52: Median abundance and richness as me
Page 53 and 54:
Water-quality data were compared to
Page 55 and 56:
Demas, C.R., Demcheck, D.K., Anders
Page 57 and 58:
Sandstrom, M.W., 1995, Filtration o
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APPENDIXES 1. Complete names for su
Page 61 and 62:
Appendix Appendix 2. 2. Pesticides
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Appendix 2. Pesticides and degradat
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Appendix 3. Concentrations of fipro
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61 Appendix 5. Mean quantitative ha
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63 Appendix 6. Classification ranki
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Appendix 8. Taxa and densities of r
Page 77 and 78:
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Page 83:
73 Appendix 9. Loadings of environm
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