The spatial extent of Walleye and Lake Sturgeon spawning migrations below a dam in the lower Black Sturgeon River, Lake Superior

IF 1.6 3区 农林科学 Q3 FISHERIES
Kerri Kosziwka, Steven J. Cooke, Karen E. Smokorowski, Friedrich Fischer, Erin S. Dunlop, Michael D. Rennie, Thomas C. Pratt
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Abstract

In the Laurentian Great Lakes, the issue of barrier removal is complicated by the presence of non-native species below barriers. A fish tracking study was conducted to guide efforts for barrier remediation decisions for the restoration of fish populations with a focus on Walleye (Scander vitreus) and Lake Sturgeon (Acipenser fulvescens) in the Black Sturgeon River, a river system fragmented by a dam which blocks access of fishes to the majority of a large, otherwise barrier-free watershed. Data from 3 years of spawning migrations (2018–2020) indicated that the Walleye population in Black Bay likely consists of both river (65%) and lake spawners (27%), with the remaining individuals spawning in the bay or river in different years. Walleye and Lake Sturgeon showed consistent differences in the extent to which individuals migrated upstream in the river during the spawning season, despite expectations that both species would spawn at the base of the dam when prevented from further migration. The dam was presumably a barrier to migration for Lake Sturgeon, as nearly all Lake Sturgeon that entered the river migrated to the base of the dam. In contrast, few Walleye entering the river during the spawning season migrated to the dam annually. These findings suggest that Walleye and Lake Sturgeon may not benefit equally, at least in the short term, from barrier remediation or dam removal.

Abstract Image

苏必利尔湖黑鲟鱼河下游大坝下的黑鲟鱼和鲟鱼产卵洄游的空间范围
在劳伦森五大湖区,由于障碍物下方存在非本地物种,障碍物清除问题变得更加复杂。我们开展了一项鱼类追踪研究,为恢复鱼类种群的障碍修复决策提供指导,重点关注黑鲟河的马黑鱼(Scander vitreus)和湖鲟(Acipenser fulvescens),这是一个被大坝分割的河流系统,大坝阻挡了鱼类进入原本无障碍的大型流域的大部分区域。3年(2018-2020年)的产卵洄游数据表明,黑湾的马黑鱼种群可能由河流(65%)和湖泊(27%)产卵者组成,其余个体在不同年份在海湾或河流产卵。在产卵季节,黑眼鲟和湖鲟鱼在河流上游洄游的程度上表现出一致的差异,尽管这两种鱼类在被阻止进一步洄游时都会在大坝底部产卵。大坝可能是鲟湖洄游的障碍,因为几乎所有进入河流的鲟湖都洄游到了大坝底部。与此相反,在产卵季节进入河中的马黑鱼每年很少洄游到大坝。这些研究结果表明,至少在短期内,障碍物修复或大坝拆除可能不会让马黑鱼和鲟鱼同样受益。
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来源期刊
Ecology of Freshwater Fish
Ecology of Freshwater Fish 农林科学-海洋与淡水生物学
CiteScore
4.10
自引率
0.00%
发文量
45
审稿时长
12-24 weeks
期刊介绍: Ecology of Freshwater Fish publishes original contributions on all aspects of fish ecology in freshwater environments, including lakes, reservoirs, rivers, and streams. Manuscripts involving ecologically-oriented studies of behavior, conservation, development, genetics, life history, physiology, and host-parasite interactions are welcomed. Studies involving population ecology and community ecology are also of interest, as are evolutionary approaches including studies of population biology, evolutionary ecology, behavioral ecology, and historical ecology. Papers addressing the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are considered if they contribute to the general understanding of freshwater fish ecology. Theoretical and modeling studies are suitable if they generate testable hypotheses, as are those with implications for fisheries. Manuscripts presenting analyses of published data are considered if they produce novel conclusions or syntheses. The journal publishes articles, fresh perspectives, and reviews and, occasionally, the proceedings of conferences and symposia.
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