The Influence of Reduced Light Intensity on the Response of Benthic Diatoms to Herbicide Exposure

Rebecca Wood, Simon Mitrovic, Richard Lim, Ben KEFFORD

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Herbicide pollution events in aquatic ecosystems often coincide with increased turbidity and reduced light intensity. It is therefore important to determine whether reduced light intensity can influence herbicide toxicity, especially to primary producers such as benthic diatoms. Benthic diatoms collected from 4 rivers were exposed to herbicides in 48 h rapid toxicity tests under high light (100 µmol m −2 s −1) and low light (20 µmol m −2 s −1) intensities. The effects of 2 herbicides (atrazine and glyphosate) were assessed on 26 freshwater benthic diatom taxa. There was no significant interaction of light and herbicide effects at the community level or on the majority (22 of 26) of benthic diatom taxa. This indicates that low light levels will likely have only a minor influence on the response of benthic diatoms to herbicides. Environ Toxicol Chem 2016;35:2252–2260.

Original languageEnglish
Pages (from-to)2252-2260
Number of pages9
JournalEnvironmental Toxicology and Chemistry
Volume35
Issue number9
DOIs
Publication statusPublished - 1 Sept 2016

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