Environmental Management

, Volume 56, Issue 3, pp 571–586

A Critical Assessment of the Ecological Assumptions Underpinning Compensatory Mitigation of Salmon-Derived Nutrients

  • Scott F. Collins
  • Amy M. Marcarelli
  • Colden V. Baxter
  • Mark S. Wipfli
Article

DOI: 10.1007/s00267-015-0538-5

Cite this article as:
Collins, S.F., Marcarelli, A.M., Baxter, C.V. et al. Environmental Management (2015) 56: 571. doi:10.1007/s00267-015-0538-5

Abstract

We critically evaluate some of the key ecological assumptions underpinning the use of nutrient replacement as a means of recovering salmon populations and a range of other organisms thought to be linked to productive salmon runs. These assumptions include: (1) nutrient mitigation mimics the ecological roles of salmon, (2) mitigation is needed to replace salmon-derived nutrients and stimulate primary and invertebrate production in streams, and (3) food resources in rearing habitats limit populations of salmon and resident fishes. First, we call into question assumption one because an array of evidence points to the multi-faceted role played by spawning salmon, including disturbance via redd-building, nutrient recycling by live fish, and consumption by terrestrial consumers. Second, we show that assumption two may require qualification based upon a more complete understanding of nutrient cycling and productivity in streams. Third, we evaluate the empirical evidence supporting food limitation of fish populations and conclude it has been only weakly tested. On the basis of this assessment, we urge caution in the application of nutrient mitigation as a management tool. Although applications of nutrients and other materials intended to mitigate for lost or diminished runs of Pacific salmon may trigger ecological responses within treated ecosystems, contributions of these activities toward actual mitigation may be limited.

Keywords

Oncorhynchus spp. Pacific salmon Atlantic salmon Stream restoration Nutrient supplementation Primary and secondary productivity 

Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Scott F. Collins
    • 1
    • 4
  • Amy M. Marcarelli
    • 2
  • Colden V. Baxter
    • 1
  • Mark S. Wipfli
    • 3
  1. 1.Stream Ecology Center, Department of Biological SciencesIdaho State UniversityPocatelloUSA
  2. 2.Department of Biological SciencesMichigan Technological UniversityHoughtonUSA
  3. 3.U.S. Geological Survey, Alaska Cooperative Fish and Wildlife Research Unit, Institute of Arctic BiologyUniversity of Alaska FairbanksFairbanksUSA
  4. 4.Illinois Natural History SurveyKaskaskia Biological StationSullivanUSA

Personalised recommendations