Abstract

Beaulieu J, Trépanier-Leroux D, Fischer JM, Olson MH, Thibodeau S, Humphries S, Fraser DJ, Derry AM. 2021. Rotenone for exotic trout eradication: nontarget impacts on aquatic communities in a mountain lake. Lake Reserv Manage. 37:323–338.

Rotenone is widely used in lake and reservoir management for the eradication of exotic fish. However, nontarget effects of rotenone on freshwater organisms such as zooplankton and macroinvertebrates are of concern because of the ecological importance of these organisms in aquatic food webs as a resource base for fish, especially when rotenone is applied to lakes prior to native fish reintroduction. The objective of our study was to determine the effects of rotenone on nontarget zooplankton and macroinvertebrate species assemblages in a headwater mountain lake where rotenone was applied to remove exotic brook trout (Salvelinus fontinalis; Banff, AB Canada). We found strong negative rotenone impacts on the community structure and density of crustacean zooplankton, and to a lesser extent on macroinvertebrates, lasting for at least 1 yr after the rotenone treatment. Our study offers 2 unique insights that differentiate from rotenone studies on other lakes: (1) the persistent and almost complete eradication of crustacean zooplankton in the following summers, 11 months after rotenone treatment, and (2) a considerable shift in the macroinvertebrate community composition, likely resulting from combined effects of both nontarget rotenone effects on taxon density and trophic interactions associated with the eradication of brook trout from the lake. We advocate that assisted recolonization in the restoration of aquatic food webs could play an important role in facilitating nontarget aquatic community recovery following lake rotenone treatment.

摘要

Beaulieu J、Trépanier-Leroux D、Fischer JM、Olson MH、Thibodeau S、Humphries S、Fraser DJ、Derry AM。2021. 用于根除外来鳟鱼的鱼藤酮：对高山湖泊中水生群落的非目标影响。湖泊保护区管理。37:323-338。

鱼藤酮广泛用于湖泊和水库管理，以消灭外来鱼类。然而，鱼藤酮对浮游动物和大型无脊椎动物等淡水生物的非靶标效应令人担忧，因为这些生物在作为鱼类资源基础的水生食物网中具有生态重要性，尤其是在重新引入本地鱼类之前将鱼藤酮应用于湖泊时。我们研究的目的是确定鱼藤酮对源头高山湖泊中非目标浮游动物和大型无脊椎动物物种组合的影响，在该湖中，鱼藤酮被用于去除外来小溪鳟鱼（Salvelinus fontinalis; 加拿大 AB 班夫）。我们发现鱼藤酮对浮游甲壳类动物群落结构和密度有很强的负面影响，对大型无脊椎动物的影响较小，在鱼藤酮处理后持续至少 1 年。我们的研究提供了 2 个独特的见解，与其他湖泊的鱼藤酮研究不同：（1）在接下来的夏天，即鱼藤酮处理后 11 个月，浮游甲壳类动物的持续和几乎完全根除，以及（2）大型无脊椎动物群落组成的显着变化，可能是由于非目标鱼藤酮对分类群密度和与从湖中根除溪鳟鱼相关的营养相互作用的综合影响所致。