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- Title
Long-term monitoring reveals the success of salmonid habitat restoration.
- Authors
Louhi, Pauliina; Vehanen, Teppo; Huusko, Ari; Mäki-Petäys, Aki; Muotka, Timo
- Abstract
The growing concern on declining salmonid populations has resulted in numerous restoration projects with variable responses worldwide. In this spatially replicated multiyear study, we assessed the long-term (12 years postrestoration) effects of in-stream habitat restoration (i.e., addition of boulders or large woody debris (LWD) together with boulders) on densities of three age-classes of juvenile brown trout ( Salmo trutta) in six forest streams in northern Finland. LWD combined with boulders was more beneficial, particularly for the larger trout (age-2 and older), than were boulder structures alone, indicating that the more diverse habitat created by LWD may have provided a safeguard against drought for the larger fish. Density of age-0+ trout showed a significant long-term increase in boulder-restored sections, providing evidence that log structures may need to be complemented by stony enhancement structures to guarantee the availability of suitable stream habitat for all trout age-classes. As trout densities are known to exhibit inherently wide interannual variability that tracks climatically induced hydrological variation, long-term postrestoration monitoring that encompasses extreme hydrological events is critical for evaluating the success of restoration projects.
- Subjects
SALMON farming; FISH habitat improvement; FISH habitats; COARSE woody debris; SEA trout
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2016, Vol 73, Issue 12, p1733
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/cjfas-2015-0546