Pacific Salmon, Nutrients, and the Dynamics of Freshwater and Riparian Ecosystems
Rent the article at a discountRent now
* Final gross prices may vary according to local VAT.Get Access
Pacific salmon (Oncorhynchus spp.) accumulate substantial nutrients in their bodies as they grow to adulthood at sea. These nutrients are carried to predominantly oligotrophic lakes and streams, where they are released during and after spawning. Research over more than 3 decades has shown that the annual deposition of salmon-borne marine-derived nutrients (MD-nutrients) is important for the productivity of freshwater communities throughout the Pacific coastal region. However, the pathways and mechanisms for MD-nutrient transfer and accumulation in freshwater and riparian ecosystems remain virtually unexplored, consequently, there are many uncertainties in this area. This article addresses three related topics. First, we summarize recent advances in our understanding of the linkages among MD-nutrients, freshwater (including riparian) ecosystems, and community dynamics by addressing the importance of MD-nutrients to lakes and streams and by then reviewing large-scale and long-term processes in the atmosphere and ocean that govern variability in salmon populations. Second, we evaluate the validity of the discoveries and their implications for active ecosystem management, noting areas where extrapolation from these results still requires great caution. Finally, we outline five key research issues where additional discoveries could greatly augment our understanding of the processes shaping the structure and dynamics of salmon populations and the characteristics of their freshwater habitat and associated riparian zones. Collectively, the data suggest that the freshwater portion of the salmon production system is intimately linked to the ocean. Moreover, for the system to be sustainable, a holistic approach to management will be required. This holistic approach will need to treat climate cycles, salmon, riparian vegetation, predators, and MD-nutrient flowpaths and feedbacks as an integrated system.
- Pacific Salmon, Nutrients, and the Dynamics of Freshwater and Riparian Ecosystems
Volume 5, Issue 4 , pp 399-417
- Cover Date
- Print ISSN
- Additional Links
- Key words: anadromous fishes; Pacific salmon; Oncorhynchus; marine nutrients; stable isotopes; lake; stream; riparian ecosystems; aquatic productivity; resource management.
- Author Affiliations
- A1. School of Aquatic and Fishery Sciences, Box 355020, University of Washington, Seattle, Washington 98195, USA, US
- A2. Technology Center, Weyerhaeuser Company, P.O. Box 9777, Federal Way, Washington 98063, USA, US
- A3. Department of Zoology, Box 351800, University of Washington, Seattle, Washington 98195, USA, US
- A4. College of Forest Resources, Box 352100, University of Washington, Seattle, Washington 98195, USA, US