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首页> 外文期刊>Estuarine Coastal and Shelf Science >Gastropod growth and survival as bioindicators of stress associated with high nutrients in the intertidal of a shallow temperate estuary
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Gastropod growth and survival as bioindicators of stress associated with high nutrients in the intertidal of a shallow temperate estuary

机译：腹足类动物的生长和存活作为浅温带河口潮间带高营养物质相关压力的生物指示

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The effects of multiple stressors on estuarine organisms are not well understood. Using cage experiments we measured the survival and growth of the pulmonate gastropod Amphibole crenata at five locations which differed contaminant levels. Water nutrients came from a nearby sewage treatment works and the sediment contained low levels of trace metals. Over 6 weeks of exposure, sediment surface chlorophyll levels varied amongst locations. The Chl a values were positively correlated with sediment N and P and trace metals As, Cd, Cu, Pb and Zn. Pulmonate survival depended on location, highest mortality was from a site close to the treatment plant and mortality rate of large individuals decreased significantly with distance away from it. For four locations, medium A. crenate had higher survival than small (juveniles) or adults. Growth rates of small individuals exceeded those for medium and large A. crenata. The mean length increment/week for medium gastropods ranged between 0.49 and 1.11 mm and was negatively correlated with the amount of Chl a in the surface sediment, suggesting the negative effects of eutrophication on gastropod growth. Growth rate of the pulmonate was not correlated with nutrient concentration or trace metal concentrations in the sediment. The dry weight condition index (Cl) did not correlate with the growth rate, and for medium individuals, was unaffected by any of the environmental variables. The Cl of small individuals was negatively affected by increasing water. nutrient levels and the Cl of large individuals negatively affected by increasing sediment nutrients and trace metal concentrations. The results from this study suggest that gastropod growth and survival could be used as tools to monitor the effects of changing nutrient levels and recovery from eutrophication within temperate estuaries. (C) 2014 Elsevier Ltd. All rights reserved,
机译：多种应激源对河口生物的影响尚不清楚。使用笼子实验，我们在五个不同污染物水平的位置测量了肺腹足纲斜生角闪石的存活和生长。水营养来自附近的污水处理厂，沉积物中的痕量金属含量低。在暴露的6周内，沉积物表面的叶绿素水平因位置而异。 Chl a值与沉积物N和P以及痕量金属As，Cd，Cu，Pb和Zn正相关。肺酸盐的生存取决于位置，最高的死亡率来自靠近处理厂的地点，大的个体的死亡率随着距离的增加而显着降低。在四个地方，中等产的A. crenate的存活率高于小型（幼年）或成年个体。小个体的生长速度超过了大中型拟南芥的生长速度。中等腹足类动物的平均周长增加量在0.49至1.11 mm之间，并且与表层沉积物中Chla的含量呈负相关，这表明富营养化对腹足类动物的生长具有负面影响。肺酸盐的生长速率与沉积物中的营养物浓度或微量金属浓度无关。干重状况指数（Cl）与生长速率不相关，对于中型个体，不受任何环境变量的影响。水分增加对小个体的Cl产生不利影响。沉积物养分的增加和微量金属的浓度对大个体的养分水平和氯含量产生负面影响。这项研究的结果表明，腹足动物的生长和存活可以用作监测营养物水平变化和温带河口富营养化恢复的工具。 （C）2014 Elsevier Ltd.保留所有权利，

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