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Ecology and Management of the Spring Snowmelt Recession

Authors
Type
Published Article
Journal
BioScience
Publisher
Oxford University Press
Publication Date
Feb 01, 2010
Volume
60
Source
Center for Watershed Sciences John Muir Institute of the Environment
License
Unknown

Abstract

We present a conceptual model for the ecology of the spring snowmelt recession based on the natural flow regime that relates the quantifiable components of magnitude, timing, and rate of change to abiotic and biotic factors that govern riverine processes. We find that shifts in the magnitude of the recession largely affect abiotic channel conditions, whereas shifts in the timing of the snowmelt primarily affect biotic conditions. Shifts in the rate of change affect both abiotic and biotic conditions, creating the largest observed changes to the stream ecosystem. We discuss these components with regard to the success of riverine species in California\textquoterights Mediterranean-montane environment. We then present two scenarios of change to the spring snowmelt recession\textemdasheffects of flow regulation and climate warming\textemdashand discuss their potential implications for riverine ecology. Our conceptual model can help guide watershed stakeholders toward a better understanding of the impacts of changing spring recession conditions on stream ecosystems.

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