Chronic herbicide exposures affect the sensitivity and community structure of tropical benthic microalgae

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• 作者：Marie Magnusson^a ; ^b ; ^c ; ^{marie.magnusson@jcu.edu.au} ; Kirsten Heimann^c ; Michael Ridd^b ; Andrew P. Negri^d
• 关键词：Diuron ; PICT ; Tropical ; Pollution ; Algae ; Biofilm
• 刊名：Marine Pollution Bulletin
• 出版年：2012
• 期刊代码：76_0025326x
• 类别：abs
• 出版时间：2012
• 卷：65
• 期：4-9
• 页码：363-372
• 文件大小：546 K

摘要

The effects of prolonged exposure to low concentrations of herbicides on tropical periphyton (biofilm) communities are largely unknown. Tropical estuarine biofilms established in microcosms were therefore exposed to diuron (photosystem-II-inhibitor) at 2-16 渭g L^鈭? for 4 weeks. The biofilms, consisting of diatoms, filamentous brown algae and cyanobacteria, developed a tolerance to diuron during this period as measured by Phyto-PAM fluorometry. Microscopy and pigment analysis revealed that this decrease in sensitivity was accompanied by a shift in species composition towards communities dominated by diatoms. The combination of techniques enabled the first identification of pollution-induced community tolerance (PICT) in tropical estuarine periphyton in response to chronic herbicide exposures. Community composition changed compared to controls at environmentally relevant concentrations of 1.6 渭g L^鈭?, while development of PICT was evident at 6.5 渭g L^鈭? diuron, with no recovery (over 2 weeks) in uncontaminated water, indicating chronic pollution induced shifts in community structure.