Differential sensitivity of flounder (Platichthys flesus) in response to oestrogenic chemical exposure: an issue for design and interpretation of monitoring and research programmes

This study was conducted as an initial investigation of 'differential response' in one of the main sentinel organisms used for monitoring programmes in United Kingdom estuaries, the flounder Platichthys flesus. It has been hypothesised that monitoring using species with a wide geographical spread and limited migration, such as flounder, might result in the comparison of different genetic stocks and certainly of populations with differing early life stage contaminant exposure histories. Furthermore, it is probable that these pre-exposure and genetic differences could manifest themselves in an ability to respond differently to contaminant exposure, so-called 'differential response'. It is important that the extent and nature of this response is understood, if we want to be able to fully interpret the monitoring data from such programmes. During this study, flounder were collected from four separate sources; wild caught fish from the estuaries of the Rivers Alde, Mersey and Tyne, and farmed flounder from Port Erin Farm, Isle of Man. Under controlled laboratory conditions, groups of fish from each source were exposed to water-borne concentrations of the synthetic oestrogen ethynylestradiol (EE2) at a nominal concentration of 50 ng/l. Plasma was taken from each male fish after 6 and 10 days exposure and analysed for the presence of vitellogenin (VTG) using an ELISA technique. Significant levels of VTG induction were evident in fish from all sources after both 6 and 10 days exposure. Flounder from the Mersey were the only fish with significantly elevated initial background levels of VTG (day 0) and this appeared to be reflected in that these specimens showed the highest induction response after day 6. However, after day 10, fish from all other sites had a slightly higher mean VTG than those from the Mersey which showed significantly (p < 0.05) lower mean plasma VTG. It is suggested that other differential responses may have been masked by the use of a high dose of EE2 which produced maximum induction in nearly all fish. The findings of the study are discussed in terms of implications for further research into the differential response issue and how the initial plasma VTG figures contribute to a time-series from the Mersey, Tyne and Alde estuaries.     

国际海道测量标准

一、背景 国际海道测量局(IHB)成立于1921年,与此同时国际海道测量组织(IHO)也应运而生,主要致力于海道测量数据采集与海图出版的规范化工作。1970年9月,当时的成员国代表正式投票通过决议,开始采用国际海道测量组织这一名称,而国际海道测量局只是其设在摩纳     

印度西南海岸Kannur区红树林沉积物的水动力反应

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全球石油资源估计及对21世纪石油产量的预测

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西北非陆缘的大规模块体坡移：被动陆缘块体坡移的一般推论

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北冰洋hinlopen—yermak滑坡以及发生海啸可能性的数值模拟

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南极Scotia海Dove山脉形成的火山作用及其岩石学、地球化学和构造环境

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1nm锰矿相的金属阳离子交换能力的研究

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地中海西北部深海水道：巴伦西亚水道的地貌,地震构造及其环境

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