Effects of prolonged exposure to 4-tert-octylphenol on toxicity and indices of oestrogenic exposure in the sand goby (Pomatoschistus minutus, Pallas)

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• 作者：Robinson ; Craig D. ; Brown ; Elaine ; Craft ; John A. ; Davies ; Ian M. ; Moffat ; Colin F.
• 关键词：Fish ; Alkylphenols ; Prolonged exposure ; Toxicity ; Oestrogen mimics ; Vitellogenin ; mRNA
• 刊名：Marine Environmental Research
• 出版年：2004
• 出版时间：July, 2004
• 年：2004
• 卷：58
• 期：1
• 页码：19-38
• 全文大小：267 K

文摘

Alkylphenolic compounds are present in estuarine and marine environments. They are moderately bioaccumulative, and oestrogenic to fish following three week, in vivo, exposures. The effects of prolonged exposure are, as yet, unclear. Sand goby (Pomatoschistus minutus) were exposed to measured concentrations of 4-tert-octylphenol (OP) in a 28-day, dose-ranging study, and a six month temporal response study. Following 28-days exposure to measured 31±6 or 101±47 μgl⁻¹ OP (mean±SD), immature male sand goby showed elevated vitellogenin (VTG) mRNA expression. Plasma alkali-labile phosphate concentrations were elevated in both sexes and were higher in females than males. Although measured OP concentrations were variable, they were significantly different for each treatment and a range of concentration-dependant effects were observed. The LC₅₀ for chronic OP exposure (8 weeks) was 29±6 μgl⁻¹, and both sexes demonstrated concentration and duration dependent increases in VTG mRNA expression. Exposure to 28±20 μgl⁻¹ OP (median±95 % CI) for 6 months inhibited development of male nuptial colouration and sperm duct glands. These findings are discussed in relation to environmental concentrations of alkylphenols and ecological concerns.