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Details van artikel 170 van 222 gevonden artikelen
| Titel: |
Relationship of Farm Level Pesticide Use and Physical Habitat on Benthic Community Status in a California Agricultural Stream |
| Auteur: |
Hall, Lenwood W. Killen, William D. Alden, Raymond W. |
| Verschenen in: |
Human and ecological risk assessment |
| Paginering: | Jaargang 13 (2007) nr. 4 pagina's 843-869 |
| Jaar: |
2007-07 |
| Inhoud: |
The objectives of this study were to: (1) evaluate temporal and spatial trends in water quality parameters, physical habitat metrics, and benthic community metrics in the Orestimba Creek from years 2000 to 2005, and (2) assess the relationship of benthic community condition from ten Orestimba Creek stations and both pesticide use at the farm level and physical habitat conditions. Significant year effects were reported for temperature, pH, dissolved oxygen, and turbidity. In general, most of the 17 physical habitat metrics did not show statistical variability over the 6-year period. Most of the benthic metrics were variable over the 6-year period. A total of 41 herbicides, 14 organophosphorus (OP) insecticides, and 5 pyrethroids were applied to 23 sections of land bordering the Orestimba Creek from 2000 to 2004. The OP insecticides showed the strongest relationship to benthic metrics using univariate regression models when all three classes of pesticides were compared; however, these statistical relationships had low R2 values. Stepwise regression analysis showed statistically significant relationships between most benthic metrics and habitat metrics. In general, both pesticide applications and physical habitat have a similar but modest statistical association with benthic communities. However, the relationship of both pesticide applications and physical habitat on benthic communities in the Orestimba Creek appear to be insignificant compared to the magnitude of spatiotemporal patterns reported. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 170 van 222 gevonden artikelen
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