Kathryn Kuivila (Former Employee)
Science and Products
Filter Total Items: 63
Pesticide transport in the San Joaquin River Basin Pesticide transport in the San Joaquin River Basin
Pesticide occurrence and concentrations were evaluated in the San Joaquin River Basin to determine potential sources and mode of transport. Land use in the basin is mainly agricultural. Spatial variations in pesticide occurrence were evaluated in relation to pesticide application and cropping patterns in three contrasting subbasins and at the mouth of the basin. Temporal variability in...
Authors
Neil M. Dubrovsky, Charles R. Kratzer, Sandra Y. Panshin, JoAnn M. Gronberg, Kathryn M. Kuivila
Exposure of delta smelt to dissolved pesticides in 1998 and 1999 Exposure of delta smelt to dissolved pesticides in 1998 and 1999
Delta smelt is a threatened species in the San Francisco Bay Estuary. Pesticide toxicity is a possible cause for the need to list this fish (Bennett and Moyle 1996; Moyle and others 1996). Numerous pesticides are transported into the estuary from area rivers (MacCoy and others 1995). However, there are minimal data to document the presence, or absence, of pesticides within delta smelt...
Authors
G. Edward Moon, Kathryn Kuivila, Catherine A. Ruhl, David H. Schoellhamer
Rice pesticide concentrations in the Colusa Basin Drain and the Sacramento River, California, 1990-1993 Rice pesticide concentrations in the Colusa Basin Drain and the Sacramento River, California, 1990-1993
The pesticides molinate, thiobencarb, and carbofuran are applied to rice (Oryza sativa L.) fields in the Sacramento Valley, California, each year during April through June. These pesticides are of concern because of their adverse effects on water quality and their potential adverse effects on aquatic life. Therefore, the California Regional Water Quality Control Board (CRWQCB) mandated...
Authors
Kathryn L. Crepeau, Kathryn M. Kuivila
Laboratory study of the response of select insecticides to toxicity identification evaluation procedures Laboratory study of the response of select insecticides to toxicity identification evaluation procedures
A laboratory study was used to evaluate the response of select insecticides to toxicity identification evaluation procedures. Fourteen insecticides, one degradation product, and one synergist were spiked into organic-grade water and carried through toxicity identification evaluation procedures. Concentrations of each compound were analyzed by gas chromatography/mass spectrometry. During...
Authors
Kathryn Kuivila, Kathryn L. Crepeau
Pesticides associated with suspended sediments in the San Francisco Bay Estuary, California Pesticides associated with suspended sediments in the San Francisco Bay Estuary, California
During the study of inputs of sediment-associated pesticides into the San Francisco Bay Estuary, suspended sediments were isolated from large-volume water samples collected over several years at various stations in Suisun Bay and also covering the principal inputs and outlet. The samples were analyzed for 21 pesticides and pesticide degradation products to provide information about the...
Authors
Brian A. Bergamaschi, Kathryn L. Crepeau, Kathryn Kuivila
Optimum sampling strategy for sediment-associated pesticides in Suisun Bay Optimum sampling strategy for sediment-associated pesticides in Suisun Bay
The purpose of this study was to develop a twice-a-day sampling strategy for suspended solids concentration at Mallard Island that best reproduces the residual (tidally averaged) near-surface suspended solids concentration computed using the entire time series (96 sampling times per day) for high delta discharge conditions and to use this stratgy for sampling sediment-associated...
Authors
Bryan W. Jennings, David H. Schoellhamer, Kathryn Kuivila
Science and Products
Filter Total Items: 63
Pesticide transport in the San Joaquin River Basin Pesticide transport in the San Joaquin River Basin
Pesticide occurrence and concentrations were evaluated in the San Joaquin River Basin to determine potential sources and mode of transport. Land use in the basin is mainly agricultural. Spatial variations in pesticide occurrence were evaluated in relation to pesticide application and cropping patterns in three contrasting subbasins and at the mouth of the basin. Temporal variability in...
Authors
Neil M. Dubrovsky, Charles R. Kratzer, Sandra Y. Panshin, JoAnn M. Gronberg, Kathryn M. Kuivila
Exposure of delta smelt to dissolved pesticides in 1998 and 1999 Exposure of delta smelt to dissolved pesticides in 1998 and 1999
Delta smelt is a threatened species in the San Francisco Bay Estuary. Pesticide toxicity is a possible cause for the need to list this fish (Bennett and Moyle 1996; Moyle and others 1996). Numerous pesticides are transported into the estuary from area rivers (MacCoy and others 1995). However, there are minimal data to document the presence, or absence, of pesticides within delta smelt...
Authors
G. Edward Moon, Kathryn Kuivila, Catherine A. Ruhl, David H. Schoellhamer
Rice pesticide concentrations in the Colusa Basin Drain and the Sacramento River, California, 1990-1993 Rice pesticide concentrations in the Colusa Basin Drain and the Sacramento River, California, 1990-1993
The pesticides molinate, thiobencarb, and carbofuran are applied to rice (Oryza sativa L.) fields in the Sacramento Valley, California, each year during April through June. These pesticides are of concern because of their adverse effects on water quality and their potential adverse effects on aquatic life. Therefore, the California Regional Water Quality Control Board (CRWQCB) mandated...
Authors
Kathryn L. Crepeau, Kathryn M. Kuivila
Laboratory study of the response of select insecticides to toxicity identification evaluation procedures Laboratory study of the response of select insecticides to toxicity identification evaluation procedures
A laboratory study was used to evaluate the response of select insecticides to toxicity identification evaluation procedures. Fourteen insecticides, one degradation product, and one synergist were spiked into organic-grade water and carried through toxicity identification evaluation procedures. Concentrations of each compound were analyzed by gas chromatography/mass spectrometry. During...
Authors
Kathryn Kuivila, Kathryn L. Crepeau
Pesticides associated with suspended sediments in the San Francisco Bay Estuary, California Pesticides associated with suspended sediments in the San Francisco Bay Estuary, California
During the study of inputs of sediment-associated pesticides into the San Francisco Bay Estuary, suspended sediments were isolated from large-volume water samples collected over several years at various stations in Suisun Bay and also covering the principal inputs and outlet. The samples were analyzed for 21 pesticides and pesticide degradation products to provide information about the...
Authors
Brian A. Bergamaschi, Kathryn L. Crepeau, Kathryn Kuivila
Optimum sampling strategy for sediment-associated pesticides in Suisun Bay Optimum sampling strategy for sediment-associated pesticides in Suisun Bay
The purpose of this study was to develop a twice-a-day sampling strategy for suspended solids concentration at Mallard Island that best reproduces the residual (tidally averaged) near-surface suspended solids concentration computed using the entire time series (96 sampling times per day) for high delta discharge conditions and to use this stratgy for sampling sediment-associated...
Authors
Bryan W. Jennings, David H. Schoellhamer, Kathryn Kuivila