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Chronic effects of atrazine exposure and recovery in freshwater benthic diatoms from two communities with different pollution histories.
Wood, Rebecca J; Mitrovic, Simon M; Lim, Richard P; Kefford, Ben J.
Afiliación
  • Wood RJ; Freshwater and Estuarine Research Group, Ecosystem Security Team, School of Life Sciences, University of Technology Sydney, PO Box 123, Broadway, NSW 2000, Australia. Electronic address: Wood.Rebecca.Jane@gmail.com.
  • Mitrovic SM; Freshwater and Estuarine Research Group, Ecosystem Security Team, School of Life Sciences, University of Technology Sydney, PO Box 123, Broadway, NSW 2000, Australia.
  • Lim RP; Freshwater and Estuarine Research Group, Ecosystem Security Team, School of Life Sciences, University of Technology Sydney, PO Box 123, Broadway, NSW 2000, Australia.
  • Kefford BJ; Institute for Applied Ecology, University of Canberra, Canberra, ACT 2601, Australia.
Aquat Toxicol ; 189: 200-208, 2017 Aug.
Article en En | MEDLINE | ID: mdl-28651182
Diffuse agricultural runoff into rivers can result in contamination with herbicides for prolonged periods of time. Chronic exposure to herbicides has the potential to alter toxic impacts in primary producers such as benthic diatoms. Determining how individual diatom taxa respond to herbicide exposure over varied exposure durations is essential for assessing herbicide impacts. This study investigated the responses of various benthic diatom taxa and effects at the community level over 12days of atrazine exposure. Diatom communities were collected from two sites with differing exposure histories; a relatively unpolluted site (Alligator Creek) and an agricultural stream (Barratta Creek) known to be polluted by atrazine and other herbicides. Diatom community composition and the proportion of healthy cells per taxon were assessed at 0, 2, 3, 6, 9 and 12days of atrazine exposure. Pollution history altered the response of the diatom community to atrazine exposure. In the Alligator Creek diatom community there was a shift in composition towards more tolerant taxa and the loss of sensitive taxa in atrazine exposed treatments. The sensitive taxon (Gomphonema truncatum) was consistently affected by atrazine toxicity. Conversely, the polluted Barratta Creek diatom community was not strongly affected by atrazine exposure. Our study shows that during chronic atrazine exposure some taxa demonstrated the ability to recover despite initial toxicity response. Recovery could be an important trait for understanding the ecological effect of herbicide exposure on diatom species in nature and in applied circumstances such as biomonitoring indices.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Atrazina / Contaminantes Químicos del Agua / Monitoreo del Ambiente / Diatomeas / Ríos / Herbicidas País/Región como asunto: Oceania Idioma: En Revista: Aquat Toxicol Asunto de la revista: BIOLOGIA / TOXICOLOGIA Año: 2017 Tipo del documento: Article Pais de publicación: Países Bajos
Texto completo
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Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Atrazina / Contaminantes Químicos del Agua / Monitoreo del Ambiente / Diatomeas / Ríos / Herbicidas País/Región como asunto: Oceania Idioma: En Revista: Aquat Toxicol Asunto de la revista: BIOLOGIA / TOXICOLOGIA Año: 2017 Tipo del documento: Article Pais de publicación: Países Bajos