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Related Concept Videos

Types of Selection01:46

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...

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Quantifying Fish Swimming Behavior in Response to Acute Exposure of Aqueous Copper Using Computer Assisted Video and Digital Image Analysis
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Pacific salmon effects on stream ecosystems: a quantitative synthesis.

David J Janetski1, Dominic T Chaloner, Scott D Tiegs

  • 1Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA. janetsk@nd.edu

Oecologia
|January 10, 2009
PubMed
Summary

Pacific salmon (Oncorhynchus spp.) are ecosystem engineers, but their impact on streams varies. This meta-analysis identified key factors like salmon biomass and stream conditions that influence these effects, crucial for conservation.

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Area of Science:

  • Ecology
  • Freshwater Biology
  • Conservation Science

Background:

  • Pacific salmon (Oncorhynchus spp.) significantly alter stream ecosystems through sediment disturbance and nutrient input.
  • Their roles as ecosystem engineers and resource subsidy providers are well-recognized, yet the magnitude of their influence is highly variable.
  • Understanding the sources of this variability is critical for effective management of salmon-dependent ecosystems.

Purpose of the Study:

  • To conduct a meta-analysis evaluating sources of variability in stream ecosystem responses to Pacific salmon.
  • To quantitatively identify environmental and methodological factors influencing salmon-stream interactions.
  • To inform strategies for preserving the ecological integrity of salmon streams.

Main Methods:

  • Meta-analysis of 37 publications encompassing 79 streams.
  • Evaluation of effects on dissolved nutrients, biofilm, macroinvertebrates, resident fish, and isotopic enrichment.
  • Analysis of influencing variables including salmon biomass, stream discharge, sediment size, and study methodology (natural runs vs. carcass additions).

Main Results:

  • Overall positive but inconsistent effects of salmon observed across response variables.
  • Salmon biomass per unit discharge positively influenced dissolved nutrients; natural runs showed stronger effects than carcass additions.
  • Benthic macroinvertebrate responses varied: positive for carcass additions, negative for small sediments (<32 mm), and positive for large sediments (>32 mm).

Conclusions:

  • Environmental factors (salmon biomass, discharge, sediment size) and methodological choices significantly influence salmon's ecological impact.
  • Natural salmon runs provide greater nutrient subsidies than artificial carcass additions.
  • Identifying variability sources is essential for understanding salmon-stream dynamics and developing targeted conservation strategies.