Abstract：
:Humans and freshwater ecosystems have a long history of cohabitation. Today, nearly all major rivers of the world have an in-stream structure which changes water flow, substrate composition, vegetation, and fish assemblage composition. The realization of these effects and their subsequent impacts on population sustainability and conservation has led to a collective effort aimed to find ways to mitigate these impacts. Barrier removal has recently received greater interest as a potential solution to restore river connectivity, and reestablish high quality habitats, suitable for feeding, refuge and spawning of fish. In the present study, we present thirty years of data from electrofishing surveys obtained at two sites, both prior to and following the removal of a small-scale hydropower dam in Central Jutland, Denmark. We demonstrate that the dam removal has led to a dramatic increase in trout density, especially in young of the year. Surprisingly, we found that this increase was not just upstream of the barrier, where the ponded zone previously was, but also downstream of the barrier, despite little changes in habitat in that area. These findings suggest that barrier removal may be the soundest conservation option to reinstate fish population productivity.
journal_name
J Environ Managejournal_title
Journal of environmental managementauthors
Birnie-Gauvin K,Larsen MH,Nielsen J,Aarestrup Kdoi
10.1016/j.jenvman.2017.09.022subject
Has Abstractpub_date
2017-12-15 00:00:00pages
467-471issue
Pt 1eissn
0301-4797issn
1095-8630pii
S0301-4797(17)30884-8journal_volume
204pub_type
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