Hydraulic modelling of the spatial and temporal variability in Atlantic salmon parr habitat availability in an upland stream.
Sci Total Environ
; 601-602: 1046-1059, 2017 Dec 01.
Article
in En
| MEDLINE
| ID: mdl-28599361
ABSTRACT
We show how spatial variability in channel bed morphology affects the hydraulic characteristics of river reaches available to Atlantic salmon parr (Salmo salar) under different flow conditions in an upland stream. The study stream, the Girnock Burn, is a long-term monitoring site in the Scottish Highlands. Six site characterised by different bed geometry and morphology were investigated. Detailed site bathymetries were collected and combined with discharge time series in a 2D hydraulic model to obtain spatially distributed depth-averaged velocities under different flow conditions. Available habitat (AH) was estimated for each site. Stream discharge was used according to the critical displacement velocity (CDV) approach. CDV defines a velocity threshold above which salmon parr are not able to hold station and effective feeding opportunities or habitat utilization are reduced, depending on fish size and water temperature. An average value of the relative available habitat (Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Environmental Monitoring
/
Ecosystem
/
Salmo salar
Type of study:
Prognostic_studies
Limits:
Animals
Language:
En
Journal:
Sci Total Environ
Year:
2017
Document type:
Article