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Fish assemblage response to a small dam removal in the Eightmile River system, Connecticut, USA.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Poulos, Helen M. Miller, Kate E. Kraczkowski, Michelle L. Welchel, Adam W. Heineman, Ross Chernoff, Barry
Spatial Coverage	Connecticut
Description	Author Affiliation: Poulos HM ( College of the Environment, Wesleyan University, Middletown, CT, 06457, USA, hpoulos@wesleyan.edu.)
Abstract	We examined the effects of the Zemko Dam removal on the Eightmile River system in Salem, Connecticut, USA. The objective of this research was to quantify spatiotemporal variation in fish community composition in response to small dam removal. We sampled fish abundance over a 6-year period (2005-2010) to quantify changes in fish assemblages prior to dam removal, during drawdown, and for three years following dam removal. Fish population dynamics were examined above the dam, below the dam, and at two reference sites by indicator species analysis, mixed models, non-metric multidimensional scaling, and analysis of similarity. We observed significant shifts in fish relative abundance over time in response to dam removal. Changes in fish species composition were variable, and they occurred within 1 year of drawdown. A complete shift from lentic to lotic fishes failed to occur within 3 years after the dam was removed. However, we did observe increases in fluvial and transition (i.e., pool head, pool tail, or run) specialist fishes both upstream and downstream from the former dam site. Our results demonstrate the importance of dam removal for restoring river connectivity for fish movement. While the long-term effects of dam removal remain uncertain, we conclude that dam removals can have positive benefits on fish assemblages by enhancing river connectivity and fluvial habitat availability.
File Format	HTM / HTML
ISSN	0364152X
Issue Number	5
Volume Number	54
e-ISSN	14321009
Journal	Environmental Management
Language	English
Publisher	Springer
Publisher Date	2014-11-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Environmental Health Conservation Of Natural Resources Methods Ecosystem Fishes Growth & Development Rivers Water Movements Animals Biodiversity Connecticut Models, Theoretical Population Dynamics Species Specificity Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Ecology Pollution Global and Planetary Change

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Fish assemblage response to a small dam removal in the Eightmile River system, Connecticut, USA.

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