The Influence of Spawning Salmon on Nutrient Dynamics and Epilithon Growth in Southeastern Alaska Streams and Estuaries

Add to Collection


Migrations by spawning Pacific salmon (Oncorhynchus spp.) deliver a major ecosystem resource subsidy of marine nutrients to nutrient-poor streams of southeastern Alaska. I examined the effects of these salmon-derived nutrients (SDN) on surface water chemistry and epilithon biomass and metabolism in streams and estuaries in southeastern Alaska. With addition of salmon material (either from salmon runs or artificial salmon products), fluxes of streamwater ammonium (NH4+-N) and soluble reactive phosphorous (SRP) increased significantly in streams and estuaries, whereas nitrate and dissolved organic carbon did not. Increases in NH4+-N and SRP were significantly larger in estuaries than in streams, suggesting that SDN were being exported from freshwater reaches to estuaries. Responses in epilithon biomass and productivity in streams and estuaries to addition of salmon material varied widely across systems. Complex interactions among environmental and biological characteristics, such as irradiance, ambient nutrients, hydrology, and salmon spawner disturbance, likely regulate epilithon growth in these systems.


Attribute NameValues
  • etd-04152005-115643

Author Anthony Daniel Cak
Advisor Gary A. Lamberti
Contributor Ronald A. Hellenthal, Committee Member
Contributor Jennifer L. Tank, Committee Member
Contributor Gary A. Lamberti, Committee Chair
Degree Level 1
Degree Discipline Biological Sciences
Degree Name Master of Science
Defense Date
  • 2005-04-04

Submission Date 2005-04-15
  • United States of America

  • Epilithon

  • Periphyton

  • Southeastern Alaska

  • Water Chemistry

  • Fresh-water

  • Estuaries

  • Pacific Salmon

  • University of Notre Dame

  • English

Access Rights Open Access
Content License
  • All rights reserved