UTILITY OF PROBABILITY-BASED SURVEY DESIGN FOR …€¦ · • Case studies • Analysis tools....
Transcript of UTILITY OF PROBABILITY-BASED SURVEY DESIGN FOR …€¦ · • Case studies • Analysis tools....
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UTILITY OF PROBABILITY-BASED SURVEY DESIGN FOR TRACKING
FISH SPECIES OF INTEREST
Matt CombesMissouri Department of Conservation
2500 S. Halliburton, Kirksville MO, 65201
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Presentation Outline
• Background• Analysis of database• Case studies• Analysis tools
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Constant justification of expenditures
Many beneficial uses touted for probability-based sample design
Many different purposes for sampling streams
Background
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Regulatory agency use of stream sampling
Impaired waters list (303d) Waters of the state list (305b)
Targeted sampling of known impairments
Random sampling
Apply results to all waters=305b list
303d list
Impaired waters located
Fish locations and population trends information incidental
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Conservation agency use of stream sampling
Species locations and population trends
Are we improving streams?
Where should we focus our resources?
Sampling of past and modeled locations
Sampling of treatments in watershed
Actions evaluated and refined
Species conserved
Clean Waters Act requirements incidental
Species Conservation
Conservation Planning
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The $100,000 question?
• Does our probability-based monitoring program sufficiently address species conservation issues (locations and population trends)?
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Analysis• 213 random sites sampled across the state of
Missouri from 2002-2005
• Visual scan of database for interesting fish locations
– locations of rare or protected species – locations of exotic species – locations where species are thought extirpated – locations outside known range of the species– locations that close gaps within range of the species
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Locations of a rare or protected species
• 261 individuals of 13 species considered to be in need of conservation (S1-S3) were found at 30 sites
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Locations of exotic species
• common carp- 79 at 21 sites• goldfish- 4 at 2 sites• silver carp- 1 at 1 site
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Locations where species are thought extirpated
• Least darter, ghost shiner, and Ozark shiner found in watersheds they were considered extirpated from
– Not collected in more than 50 years– Sampling had occurred during the 50 years
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Locations outside known range of species
• Case studies– logperch (Percina caprodes)– chestnut lamprey (Ichthyomyzon castaneus)– warmouth (Lepomis gulosus)– slenderhead darter (Percina phoxocephala)
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Case Study- logperch
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Case Study- logperch
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Case Study- logperch
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Case Study- chestnut lamprey
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Case Study- chestnut lamprey
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Case Study- chestnut lamprey
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Case Study- warmouth
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Case Study- warmouth
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Case Study- warmouth
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Case Study- slenderhead darter
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Case Study- slenderhead darter
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Case Study- slenderhead darter
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Analysis Tools
• Visual comparison of new locations to historic locations for approximately 100 species per year is impractical
• Should be able to automate the process
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Analysis Tools
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Analysis Tools
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Analysis Tools
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Summary• Often asked if probability-based sample design
meets species conservation objectives
• Able to:– locate rare and protected species – locate exotic species – locate species where they are thought extirpated – locate species outside of known range– close gaps within known range of the species
• Trying to automate the procedure
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Conclusions
Yes!
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