Nutrient dynamics in a highly managed reservoir system: considering anadromous sockeye salmon (Oncorhynchus nerka) and nutrient restoration

Nutrient dynamics in a highly managed reservoir system: considering anadromous sockeye salmon (Oncorhynchus nerka) and nutrient restoration

Scott DC, Harris SL, Hebert AS, van Poorten BT. 2017. Nutrient dynamics in a highly managed reservoir system: considering anadromous sockeye salmon (Oncorhynchus nerka) and nutrient restoration. Lake Reserve Manage. 33:14-22. Modeling nutrient flux in Alouette Reservoir, British Columbia, allowed us...

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Published in:Lake and reservoir management Vol. 33; no. 1; pp. 14 - 22
Main Authors: Scott, David C., Harris, Shannon L., Hebert, Allison S., van Poorten, Brett T.
Format: Journal Article
Language:English
Published: Madison Taylor & Francis 02-01-2017
Taylor & Francis Books Inc
Subjects:
Adults
Anadromy
Dynamics
Exports
Fish
Fisheries
Flushing
Flux
Freshwater fishes
High flow
Juveniles
Kokanee
lake fertilization
lake restoration
Lakes
Migrations
Mineral nutrients
Modelling
Nitrogen
Nutrient dynamics
Nutrient loss
nutrient management
Nutrients
Oncorhynchus nerka
Parents
Phosphorus
Reservoir fisheries
Reservoir management
Restoration
Salmon
sockeye salmon
Spillways
Surface water
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Summary:Scott DC, Harris SL, Hebert AS, van Poorten BT. 2017. Nutrient dynamics in a highly managed reservoir system: considering anadromous sockeye salmon (Oncorhynchus nerka) and nutrient restoration. Lake Reserve Manage. 33:14-22. Modeling nutrient flux in Alouette Reservoir, British Columbia, allowed us to (1) determine the relative importance of key factors that influence its nutrient dynamics and (2) evaluate the potential value of returning anadromous salmon to this highly altered reservoir. Annual surface water releases over the dam spillway have facilitated out-migration of juvenile sockeye salmon (Oncorhynchus nerka) produced by resident kokanee parents since 2005, and these juveniles have returned as adult sockeye annually since 2007, thus restoring an anadromous run lost for nearly 90 years. This re-anadromization program may have an effect on the nutrient restoration program, which includes annual additions of nitrogen and phosphorus designed to enhance the recreational kokanee fishery within the reservoir. High flow release to facilitate juvenile out-migration resulted in a net export of nutrients because few adults returned, and a portion of nutrients added to the reservoir were flushed downstream. If only anadromous sockeye are considered, however, nutrient flux was positive in 5 of 6 years for nitrogen (average 2.30 kg; range −1.06 to 5.97), and in 4 of 6 years for phosphorus (average 0.24 kg; range −0.15 to 0.62). Overall, our results show the export of nutrients by the anadromy restoration project represents an average of just 1.54 and 0.60%, respectively, of the seasonal nitrogen and phosphorus budget for the system. Therefore, although the anadromy restoration results in a net loss of nutrients from the system, its effect on the nutrient restoration project is minimal.
ISSN:1040-2381
2151-5530
DOI:10.1080/10402381.2016.1247391