Abstract The control of invasive sea lamprey in the Great Lakes basin has been highly successful, but has deleteriously affected native lamprey species. American brook, northern brook, silver and chestnut lampreys are all susceptible to lampricide treatments. Incidental catch from surveys that targeted sea lamprey were used to determine changes in distributions and catch rates of these native species within the Great Lakes basin since the onset of the sea lamprey control program. Over 2.4 million native lampreys were collected during sea lamprey control operations between 1947 and 2018. Native lampreys were no longer captured from many treated and untreated streams. Silver lamprey and northern brook lamprey distributions were reduced most substantially. These species were no longer found in about three quarters of the number of streams in which they were historically present. The number of streams inhabited by chestnut lamprey has diminished by half. American brook lamprey were still present in the majority of streams previously occupied. Catch rates declined in northern brook lamprey and Ichthyomyzon larvae in some Great Lakes basins, but changes in collection gear and methods made comparisons difficult. Trap and weir data show drastic declines in silver lamprey and chestnut lamprey. Streams that have not been treated with lampricide have suffered similar or greater declines in both the number of streams occupied and catch rates for all four species when compared to untreated streams. Therefore reductions in native lamprey populations were likely due to a number of environmental changes, and not exclusively from lampricide treatments.

中文翻译：

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自海七鳃鳗 (Petromyzon marinus) 控制开始以来五大湖地区原生七鳃鳗种群的变化

摘要 五大湖流域入侵海七鳃鳗的控制非常成功，但对本地七鳃鳗物种造成了有害影响。美国溪、北溪、银七鳃鳗和栗七鳃鳗都容易受到杀灭灯剂处理的影响。自海七鳃鳗控制计划开始以来，针对海七鳃鳗的调查附带的捕获量被用来确定五大湖盆地内这些本地物种的分布和捕获率的变化。在 1947 年至 2018 年期间的海七鳃鳗控制行动中收集了超过 240 万只本地七鳃鳗。不再从许多经过处理和未经处理的溪流中捕获本地七鳃鳗。银七鳃鳗和北溪七鳃鳗的分布减少幅度最大。这些物种在它们历史上存在的溪流中的大约四分之三不再被发现。栗七鳃鳗栖息的溪流数量减少了一半。美洲溪七鳃鳗仍然存在于先前占据的大部分溪流中。一些五大湖盆地的北溪七鳃鳗和 Ichthyomyzon 幼虫的捕获率下降，但收集设备和方法的变化使比较变得困难。陷阱和堰数据显示银七鳃鳗和栗七鳃鳗数量急剧下降。与未经处理的溪流相比，未用杀灭灯剂处理的溪流在所有四种物种的占用溪流数量和捕获率方面都遭受了类似或更大的下降。因此，本地七鳃鳗种群的减少很可能是由于一些环境变化造成的，