US Army Corps of Engineers
Portland District Website Website

Ecosystem-complex processes

Ecosystem-complex processes are a series of biological, chemical, or physical steps or operations which have a given result or product in the ecosystem.


Processes form the fundamental conditions and outputs of the ecosystem.


  • List of ecosystem-complex processes in the Columbia River system:
  • Element cycling
  • Food web support
  • Primary production
  • Refuge
  • Reproduction
  • Successional development
  • Sediment supply and trapping
  • Water storage

Contact information

Ronald Thom, Ph.D

Marine Research Operations, PNNL
1529 W. Sequim Bay Rd.
Sequim, WA 98382