Evaluating Fish Response to Habitat Restoration - PowerPoint PPT Presentation

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Evaluating Fish Response to Habitat Restoration

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Evaluating Fish Response to Habitat Restoration – PowerPoint PPT presentation

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Title: Evaluating Fish Response to Habitat Restoration


1
Evaluating Fish Response to Habitat Restoration
  • Overview of Intensively Monitored Watershed
    Research in the PNW
  • Rationale for IMW approach
  • Extent of current efforts
  • Example of results from an IMW effort
  • Fish Creek (Dr. Gordon Reeves)

2
Issue Being Addressed
  • Many millions of have been spent in the PNW
    on salmon habitat restoration and protection
  • Expectation that these actions will increase the
    productivity of fish populations
  • Little direct evidence that these efforts have
    been effective
  • This knowledge is essential to
  • Effectively allocate restoration resources
  • Estimate the contribution to recovery of
    tributary habitat actions

3
Relationship between Freshwater Habitat Condition
and Salmon Productivity
  • Relationship is difficult to quantify
  • Variability in fish populations due to factors
    other than freshwater habitat
  • Year-to-year variation in climate
  • Data on fish populations is lacking
  • Each species requires a suite of habitat types to
    complete freshwater life rearing
  • The relative importance of each type of habitat
    varies spatially and temporally

4
IMW Concept
  • IMW approach based on the premise that
    watershed-scale experiments are an effective
    means to study salmon-habitat relationships
  • Quantification of salmon response to habitat
    actions requires assessment at appropriate scales
    of space and time
  • Experimental unit large enough to include all the
    habitats required for freshwater rearing
  • Unit small enough so a high proportion of the
    habitat can be treated
  • Evaluation over sufficient time to be able to
    detect a response
  • Expense requires that IMWs occur at relatively
    few locations
  • Various designs have been employed
  • Long-term, paired-watershed experiments
  • BACI design
  • Single watershed quantify ecological processes
  • Most IMWs collect data on a basic set of
    parameters
  • Habitat (physical, chemical)
  • Fish populations (fry, parr, smolts, adults)

5
Scientific Support for the Concept
  • Number of regional science panels have
    recommended this type of approach
  • NOAA Fisheries SRSP - grand experiments
  • ISAB/ISRP- intensive watershed monitoring
    advocated in numerous reports
  • Monitoring design for WA forest practices
    identified IMW as a component of effectiveness
    monitoring
  • WA ISP has reviewed the WA IMW program twice and
    concurred with the approach

6
WA IMW Lower Columbia Study Sites
7
Location of Some Current IMWs
8
Issues Raised about IMWs
  • Time required to detect a response
  • Long studies traditionally required owing to
    interannual variation in salmon abundance and
    climate
  • Difficult to obtain consistent funding for
    long-term studies
  • Transferability of results
  • Are results of an IMW study only applicable to
    the watersheds where the studies were conducted?

9
Time to Detect Results
WA IMW - Seabeck Creek p0.05
10
Transferability of Results
  • Large number of watershed-scale manipulative
    studies established in last 5 years
  • Increased sample size (comparable questions and
    data collection methods)
  • Comparison of results will provide indication of
    generality
  • Expect like responses from watersheds with
    comparable conditions
  • Classification of watersheds across the region
    being conducted by NOAA-Fisheries
  • IMWs provide understanding of processes governing
    relationships between habitat and fish population
    response
  • Many of these relationships will be broadly
    applicable
  • Greatly improve our ability to parameterize
    predictive models currently in use
  • IMWs will help to identify habitat parameters
    most relevant to fish
  • Useful in gauging watershed condition regionally
  • Provides direct linkage between the IMW efforts
    and status and trend monitoring being conducted
    at broader scale
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