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The migration of four salmonid species through fish bypass channels depending on environmental factors
Environmental Biology of Fishes ( IF 1.4 ) Pub Date : 2022-03-03 , DOI: 10.1007/s10641-022-01233-9
Tobias Epple 1 , Arne Friedmann 2 , Karl-Friedrich Wetzel 2 , Oliver Born 3 , Gernot Müller 4
Affiliation  

The upstream migration of four potamodromous salmonid species (brown trout Salmo trutta fario, grayling Thymallus thymallus, Danube salmon Hucho hucho, rainbow trout Oncorhynchus mykiss) through five fish bypass channels in southern Germany was investigated almost daily with fish counting pools from April 2017 to December 2019. In addition, 14 abiotic environmental factors (water temperature, change of the water temperature, discharge, change of the discharge, suspended matter content, change of the suspended matter content, day length, day of the lunar cycle, wind speed, global radiation, air pressure, change of air pressure, fluctuations of the earth’s magnetic field, earth tremors) of the project area were recorded. Using generalized linear models, the environmental factors that significantly affect the ascension rates of the investigated species were determined. In addition, juvenile and adult individuals were considered separately. All significant environmental factors were then evaluated in detail. The individual species react clearly differently to the investigated environmental factors. Especially the ascent rates of grayling and Danube salmon showed strong correlations with water temperature and day length. While high ascent rates of adult individuals were observed mainly during the typical water temperature and season for their spawning season, juvenile individuals were found most frequently in midsummer at high water temperatures. The ascent numbers of rainbow trout showed a much less clear correlation with the environmental factors than the other species considered.



中文翻译:

四种鲑鱼物种通过鱼类旁路的迁移取决于环境因素

四种流域鲑鱼(褐鳟Salmo trutta fario、grayling Thymallus thymallus、多瑙河鲑Hucho hucho、虹鳟Oncorhynchus mykiss )的上游洄游) 在 2017 年 4 月至 2019 年 12 月期间,几乎每天都对德国南部的 5 个鱼类旁路进行了鱼类计数池的调查。此外,14 个非生物环境因素(水温、水温变化、排放量、排放量变化、悬浮物记录项目区悬浮物含量、悬浮物含量变化、昼长、月转日、风速、全球辐射、气压、气压变化、地磁场波动、地震动)。使用广义线性模型,确定了显着影响被调查物种提升率的环境因素。此外,青少年和成年个体被分开考虑。然后详细评估所有重要的环境因素。各个物种对所研究的环境因素的反应明显不同。尤其是河鳟和多瑙河鲑的上升速度与水温和日长有很强的相关性。虽然主要在典型的水温和产卵季节观察到成年个体的高上升率,但在仲夏高水温时发现幼体个体最常见。与所考虑的其他物种相比,虹鳟鱼的上升数量与环境因素的相关性要低得多。虽然主要在典型的水温和产卵季节观察到成年个体的高上升率,但在仲夏高水温时发现幼体个体最常见。与所考虑的其他物种相比,虹鳟鱼的上升数量与环境因素的相关性要低得多。虽然主要在典型的水温和产卵季节观察到成年个体的高上升率,但在仲夏高水温时发现幼体个体最常见。与所考虑的其他物种相比,虹鳟鱼的上升数量与环境因素的相关性要低得多。

更新日期:2022-03-03
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