The Survival of Atlantic Salmon (Salmo salar) Eggs During Dewatering in a River Subjected to Hydropeaking
Hydropeaking in regulated rivers is likely to become more frequent with increasing demands for renewable energy. Sudden fluctuations affect surface and subsurface flow regimes and change hydrological interactions occurring in the hyporheic zone. The hyporheic zone plays an important role for salmon...
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Online Access: | http://hdl.handle.net/11250/2490036 https://doi.org/10.1002/rra.2827 |
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ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2490036 2023-05-15T15:32:12+02:00 The Survival of Atlantic Salmon (Salmo salar) Eggs During Dewatering in a River Subjected to Hydropeaking Casas-Mulet, Roser Saltveit, Svein Jakob Alfredsen, Knut 2015 http://hdl.handle.net/11250/2490036 https://doi.org/10.1002/rra.2827 eng eng Wiley Norges forskningsråd: 193818 Rivers Research and Applications: an international journal devoted to river research and management. 2015, 31 (4), 433-446. urn:issn:1535-1459 http://hdl.handle.net/11250/2490036 https://doi.org/10.1002/rra.2827 cristin:1148891 433-446 31 Rivers Research and Applications: an international journal devoted to river research and management 4 Journal article Peer reviewed 2015 ftntnutrondheimi https://doi.org/10.1002/rra.2827 2019-09-17T06:53:33Z Hydropeaking in regulated rivers is likely to become more frequent with increasing demands for renewable energy. Sudden fluctuations affect surface and subsurface flow regimes and change hydrological interactions occurring in the hyporheic zone. The hyporheic zone plays an important role for salmon embryonic development, and groundwater influx may create refuges for egg survival during low flow in hydropeaking regulated rivers. The links between salmon embryo survival and hyporheic hydrological processes during hydropeaking have hardly been investigated. A field experiment was undertaken in a 5 × 20 m side gravel bar subject to dewatering due to hydropeaking. Eleven cylindrical boxes composed of eight compartments were placed in the permanently wet area and the ramping zone. Sixty eggs were placed in two compartments (at 10 and 30 cm depth) in each box. Surface and interstitial water levels and temperatures were monitored at 2 min resolution. Data were collected for a period of 3 months, coinciding with early stages of salmonid egg development in this catchment. Egg compartments were checked on six occasions for survival after different hydropeaking events. Dead eggs were counted and removed. Survival rates were lower in the top compartments in the ramping zone (78%) compared with the boxes in the permanently wet area and the lowermost compartments in the ramping (survival rates >99%). With no water quality issues in the catchment and very low inputs of fine sediments in the egg compartments, exposure to dry conditions and subzero temperatures were the main factors explaining egg mortality in the top compartments of the ramping zone. The rate of survival will thus depend on the surface water and groundwater interactions. Site-specific hydrological interactions occurring in the hyporheic zone should be actively considered when managing fish populations in rivers with hydropeaking. acceptedVersion This is the peer reviewed version of the following article: [The Survival of Atlantic Salmon (Salmo salar) Eggs During Dewatering in a River Subjected to Hydropeaking], which has been published in final form at [http://onlinelibrary.wiley.com/doi/10.1002/rra.2827/abstract;jsessionid=610CBA0A377679B9552239E0E4DEC776.f03t01]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. Article in Journal/Newspaper Atlantic salmon Salmo salar NTNU Open Archive (Norwegian University of Science and Technology) River Research and Applications 31 4 433 446 |
institution |
Open Polar |
collection |
NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
description |
Hydropeaking in regulated rivers is likely to become more frequent with increasing demands for renewable energy. Sudden fluctuations affect surface and subsurface flow regimes and change hydrological interactions occurring in the hyporheic zone. The hyporheic zone plays an important role for salmon embryonic development, and groundwater influx may create refuges for egg survival during low flow in hydropeaking regulated rivers. The links between salmon embryo survival and hyporheic hydrological processes during hydropeaking have hardly been investigated. A field experiment was undertaken in a 5 × 20 m side gravel bar subject to dewatering due to hydropeaking. Eleven cylindrical boxes composed of eight compartments were placed in the permanently wet area and the ramping zone. Sixty eggs were placed in two compartments (at 10 and 30 cm depth) in each box. Surface and interstitial water levels and temperatures were monitored at 2 min resolution. Data were collected for a period of 3 months, coinciding with early stages of salmonid egg development in this catchment. Egg compartments were checked on six occasions for survival after different hydropeaking events. Dead eggs were counted and removed. Survival rates were lower in the top compartments in the ramping zone (78%) compared with the boxes in the permanently wet area and the lowermost compartments in the ramping (survival rates >99%). With no water quality issues in the catchment and very low inputs of fine sediments in the egg compartments, exposure to dry conditions and subzero temperatures were the main factors explaining egg mortality in the top compartments of the ramping zone. The rate of survival will thus depend on the surface water and groundwater interactions. Site-specific hydrological interactions occurring in the hyporheic zone should be actively considered when managing fish populations in rivers with hydropeaking. acceptedVersion This is the peer reviewed version of the following article: [The Survival of Atlantic Salmon (Salmo salar) Eggs During Dewatering in a River Subjected to Hydropeaking], which has been published in final form at [http://onlinelibrary.wiley.com/doi/10.1002/rra.2827/abstract;jsessionid=610CBA0A377679B9552239E0E4DEC776.f03t01]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. |
format |
Article in Journal/Newspaper |
author |
Casas-Mulet, Roser Saltveit, Svein Jakob Alfredsen, Knut |
spellingShingle |
Casas-Mulet, Roser Saltveit, Svein Jakob Alfredsen, Knut The Survival of Atlantic Salmon (Salmo salar) Eggs During Dewatering in a River Subjected to Hydropeaking |
author_facet |
Casas-Mulet, Roser Saltveit, Svein Jakob Alfredsen, Knut |
author_sort |
Casas-Mulet, Roser |
title |
The Survival of Atlantic Salmon (Salmo salar) Eggs During Dewatering in a River Subjected to Hydropeaking |
title_short |
The Survival of Atlantic Salmon (Salmo salar) Eggs During Dewatering in a River Subjected to Hydropeaking |
title_full |
The Survival of Atlantic Salmon (Salmo salar) Eggs During Dewatering in a River Subjected to Hydropeaking |
title_fullStr |
The Survival of Atlantic Salmon (Salmo salar) Eggs During Dewatering in a River Subjected to Hydropeaking |
title_full_unstemmed |
The Survival of Atlantic Salmon (Salmo salar) Eggs During Dewatering in a River Subjected to Hydropeaking |
title_sort |
survival of atlantic salmon (salmo salar) eggs during dewatering in a river subjected to hydropeaking |
publisher |
Wiley |
publishDate |
2015 |
url |
http://hdl.handle.net/11250/2490036 https://doi.org/10.1002/rra.2827 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
433-446 31 Rivers Research and Applications: an international journal devoted to river research and management 4 |
op_relation |
Norges forskningsråd: 193818 Rivers Research and Applications: an international journal devoted to river research and management. 2015, 31 (4), 433-446. urn:issn:1535-1459 http://hdl.handle.net/11250/2490036 https://doi.org/10.1002/rra.2827 cristin:1148891 |
op_doi |
https://doi.org/10.1002/rra.2827 |
container_title |
River Research and Applications |
container_volume |
31 |
container_issue |
4 |
container_start_page |
433 |
op_container_end_page |
446 |
_version_ |
1766362700942671872 |