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首页> 外文期刊>Environments >Seasonal Variations in the Use of Profundal Habitat among Freshwater Fishes in Lake Norsj?, Southern Norway, and Subsequent Effects on Fish Mercury Concentrations
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Seasonal Variations in the Use of Profundal Habitat among Freshwater Fishes in Lake Norsj?, Southern Norway, and Subsequent Effects on Fish Mercury Concentrations

机译：挪威南部诺西湖中淡水鱼的深层生境利用的季节性变化及其对鱼类汞含量的后续影响

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This study is based on monthly sampling of fish from grates mounted at an industrial water intake, located at a depth of 50 m in Lake Norsj? (Southern Norway) during the year 2014, to investigate seasonal variations in the use of the profundal habitat and subsequent variations in total Hg-concentrations in profundal fish. Data on various fish present in a cold and dark hypolimnion of a large, deep, dimictic lake within the upper temperate zone of the Northern Hemisphere are rare. While predominant species such as A. charr ( Salvelinus alpinus ) and E. smelt ( Osmerus eperlanus ) were continuously present in this habitat, whitefish ( Coregonus lavaretus ) occupied this habitat primarily during wintertime, while other common species like brown trout ( Salmo trutta ), perch ( Perca fluviatilis ) and northern pike ( Esox lucius ) were almost absent. Besides stomach analyses (diet) and biometry, stable isotope analyses (δ 15 N and δ 13 C) and total mercury (Tot-Hg) analyses were carried out on the caught fish. The δ 13 C signature and stomach analyses revealed a combined profundal-pelagic diet for all three species, A. charr with the most profundal-based diet. Length was the strongest predictor for Hg in whitefish and A. charr, while age was the strongest explanatory variable for Hg in E. smelt. A. charr was the only species exhibiting seasonal variation in Hg, highest during winter and spring.
机译：这项研究是基于每月从位于工业用水口（位于诺西湖50 m深度处）的炉排上的鱼中取样的结果。 （挪威南部）在2014年期间，调查了深海鱼类栖息地使用情况的季节性变化以及深海鱼类总Hg浓度的后续变化。在北半球上温带的一个大型的，深陷的，干mic的湖泊中，存在着冷淡暗的水生动物中各种鱼类的数据很少。尽管该栖息地中持续存在着主要物种，如沙尔氏菌（Salvelinus alpinus）和臭味大肠杆菌（Osmerus eperlanus），但白鱼（Coregonus lavaretus）主要在冬季占据了该栖息地，而其他常见物种如褐鳟（Salmo trutta）几乎没有鲈鱼（Perca fluviatilis）和北部梭子鱼（Esox lucius）。除了进行胃分析（饮食）和生物测定法外，还对捕获的鱼进行了稳定的同位素分析（δ15 N和δ13 C）和总汞（Tot-Hg）分析。 δ13​​ C信号和胃部分析显示，这三种物种的深海食物都以深海食物为基础，而深海食物以深海食物为基础。长度是白鱼和炭疽菌中汞含量的最强预测因子，而年龄是冶炼大肠杆菌中汞含量的最强解释变量。炭疽菌是唯一表现出汞的季节性变化的物种，在冬季和春季最高。

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