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首页> 外文期刊>Journal of great lakes research >Trends in Mysis diluviana abundance in the Great Lakes, 2006-2016
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Trends in Mysis diluviana abundance in the Great Lakes, 2006-2016

机译：2006-2016年大湖地区Mysis diluviana丰度趋势

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With the large Diporeia declines in lakes Michigan, Huron, and Ontario, there is concern that a similar decline of Mysis diluviana related to oligotrophication and increased fish predation may occur. Mysis density and biomass were assessed from 2006 to 2016 using samples collected by the Great Lakes National Program Office's biomonitoring program in April and August in all five Great Lakes. Summer densities and biomasses were generally greater than spring values and both increased with bottom depth. There were no significant time trends during these 10-11 years in lakes Ontario, Michigan, or Huron, but there was a significant increase in Lake Superior. Density and biomass were highest in lakes Ontario and Superior, somewhat lower in Lake Michigan, and substantially lower in Lake Huron. A few Mysis were collected in eastern Lake Erie, indicating a small population in the deep basin of that lake. On average, mysids contributed 12-18% (spring-summer, Michigan), 18-14% (spring-summer, Superior), 30-13% (spring-summer, Ontario), and 3% (Huron) of the total open-water crustacean biomass. Size distributions consisted of two peaks, indicating a 2-year life cycle in all four of the deep lakes. Mysis were larger in Lake Ontario than in lakes Michigan, Superior, and Huron. Comparisons with available historic data indicated that mysid densities were higher in the 1960s-1990s (5 times higher in Huron, 2 times higher in Ontario, and around 40% higher in Michigan and Superior) than in 2006-2016. (C) 2018 International Association for Great Lakes Research. Published by Elsevier B.V. All rights reserved.
机译：随着密歇根州，休伦湖和安大略湖中的二孔虫大量减少，人们担心与低营养化和鱼类捕食增加有关的Mysis diluviana病也有类似的下降。 2006年至2016年使用大湖国家计划办公室的生物监测计划于4月和8月在所有5个大湖中收集的样本对Mysis密度和生物量进行了评估。夏季密度和生物量通常大于春季值，并且两者均随底部深度增加。在这10-11年间，安大略湖，密歇根州或休伦湖没有明显的时间趋势，但苏必利尔湖却有明显的增长趋势。安大略湖和苏必利尔湖的密度和生物量最高，密歇根湖稍低，休伦湖则低得多。在伊利湖东部收集了一些Mysis，这表明该湖深水区的人口很少。平均而言，mysids占总数的12-18％（密歇根州春夏），18-14％（高级春夏），30-13％（安大略省春夏）和3％（休伦）开阔水域甲壳类生物质。大小分布由两个峰值组成，表明所有四个深湖的生命周期均为2年。安大略湖中的Mysis大于密歇根湖，苏必利尔湖和休伦湖。与现有历史数据的比较表明，与2006-2016年相比，1960年代至1990年代的怪胎密度更高（休伦河的密度高5倍，安大略省的2倍，密歇根州和苏必利尔地区高40％）。 （C）2018国际大湖研究协会。由Elsevier B.V.发布。保留所有权利。

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