Fish Assemblages in the Penobscot River: A Decade after Dam Removal

IF 1.8 3区 农林科学 Q2 FISHERIES
Kory A. Whittum, Joseph D. Zydlewski, Stephen M. Coghlan Jr, Daniel B. Hayes, Jonathan Watson, Ian Kiraly
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引用次数: 3

Abstract

The Penobscot River Restoration Project in Maine was a large river rehabilitation project that culminated in the removal of the two lowermost dams and improvements to fish passage on several remaining dams. Fish assemblages were surveyed for 3 years prior to rehabilitation, 3 years after rehabilitation, and 8 years after rehabilitation. Approximately 475 km of shoreline were sampled via boat electrofishing, yielding 133,394 individual fish of 41 species. The greatest shifts in assemblage structure occurred immediately after dam removal in formerly impounded sections, with an increased prevalence of riverine and migratory species. Long-term sampling documented changes within tributaries and tidally influenced river segments, where large schools of adult and young-of-the-year alosines increased in abundance. Upstream of the lowermost dam, the river remains dominated by lacustrine species, while adult anadromous fishes continue to be most abundant immediately downstream of the lowermost dam. Our results provide increased evidence that dam removals result in altered fish assemblages, which are now dominated by riverine and anadromous species in previously impounded habitats. Alosines in the Penobscot River have exhibited the greatest long-term response to river restoration efforts.

Abstract Image

佩诺布斯科特河的鱼类群落:大坝拆除后的十年
缅因州的佩诺布斯科特河恢复项目是一个大型河流修复项目,最终拆除了两座最低的水坝,并改善了其余几座水坝的鱼类通道。对康复前3年、康复后3年和康复后8年的鱼类种群进行调查。通过电钓船对大约475公里的海岸线进行取样,共捕获41种133,394条鱼。在原蓄水区,群落结构的最大变化发生在大坝拆除后,河流和迁徙物种的流行率增加。长期取样记录了支流和受潮汐影响的河段的变化,在这些河段,成年和年轻的孤氨酸大量增加。在最底坝的上游,河流仍然以湖栖物种为主,而在最底坝的下游,成年溯河鱼类仍然是最丰富的。我们的研究结果提供了越来越多的证据,表明大坝拆除会导致鱼类组合的改变,现在在以前被扣押的栖息地中,鱼类组合主要是河流和溯河物种。Penobscot河中的Alosines对河流修复工作表现出最大的长期反应。
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来源期刊
Marine and Coastal Fisheries
Marine and Coastal Fisheries FISHERIES-MARINE & FRESHWATER BIOLOGY
CiteScore
3.40
自引率
5.90%
发文量
40
审稿时长
>12 weeks
期刊介绍: Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science publishes original and innovative research that synthesizes information on biological organization across spatial and temporal scales to promote ecologically sound fisheries science and management. This open-access, online journal published by the American Fisheries Society provides an international venue for studies of marine, coastal, and estuarine fisheries, with emphasis on species'' performance and responses to perturbations in their environment, and promotes the development of ecosystem-based fisheries science and management.
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