Your browser doesn't support javascript.
loading
Escherichia coli efflux from rangeland ecosystems in the southcentral Great Plains of the United States.
Phillippe, Austin J; Wagner, Kevin L; Will, Rodney E; Zou, Chris B.
Afiliação
  • Phillippe AJ; Department of Natural Resource Ecology and Management, Oklahoma State University, Oklahoma City, Oklahoma, USA.
  • Wagner KL; Oklahoma Water Resources Center, Oklahoma State University, Oklahoma City, Oklahoma, USA.
  • Will RE; Oklahoma Water Resources Center, Oklahoma State University, Oklahoma City, Oklahoma, USA.
  • Zou CB; Department of Plant and Soil Sciences, Oklahoma State University, Oklahoma City, Oklahoma, USA.
J Environ Qual ; 53(1): 78-89, 2024.
Article em En | MEDLINE | ID: mdl-37902423
ABSTRACT
Bacterial contamination of surface water is a public health concern. To quantify the efflux of Escherichia coli into ephemeral and intermittent streams and assess its numbers in relation to secondary body contact standards, we monitored runoff and measured E. coli numbers from 10 experimental watersheds that differed in vegetation cover and cattle access in north-central Oklahoma. Escherichia coli numbers were not significantly different among the watersheds, with one exception; the grazed prairie watershed (GP1) had greater numbers compared to one ungrazed prairie watershed (UP2). Median E. coli numbers in runoff from ungrazed watersheds ranged from 260 to 1482 MPN/100 mL in comparison with grazed watersheds that ranged from 320 to 8878 MPN/100 mL. In the GP1 watershed, higher cattle stocking rates during pre- and post-calving (February-May) resulted in significantly greater bacterial numbers and event loading compared to periods with lower stocking rates. The lack of significance among watersheds is likely due to the grazed sites being rotationally (and lightly) grazed, data variability, and wildlife contributions. To address wildlife sources, we used camera trap data to assess the usage in the watersheds; however, the average number of animals in a 24-h period did not correlate with observed median E. coli numbers. Because of its impacts on E. coli numbers in water, grazing management (stocking rate, rotation, and timing) should be considered for improving water quality in streams and reservoirs.
Assuntos

Texto completo: 1 Coleções: 01-internacional Contexto em Saúde: 3_ND Base de dados: MEDLINE Assunto principal: Ecossistema / Escherichia coli Limite: Animals País/Região como assunto: America do norte Idioma: En Revista: J Environ Qual Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Contexto em Saúde: 3_ND Base de dados: MEDLINE Assunto principal: Ecossistema / Escherichia coli Limite: Animals País/Região como assunto: America do norte Idioma: En Revista: J Environ Qual Ano de publicação: 2024 Tipo de documento: Article