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J. R. Tomelleri

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J. R. Tomelleri

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  1. Weber River metapopulation and source-sink dynamics of native and endemic fishes Samuel McKay Utah State University / Utah Division of Wildlife Resources Phaedra BudyUS Geologic Survey/Utah Cooperative Fish Wildlife Research Unit Paul Thompson and the Northern Region Office Utah Division of Wildlife Resources J. R. Tomelleri J. R. Tomelleri

  2. Metapopulations in Aquatic Systems • Populations interacting over space and time • Range of habitats • Dispersal in river systems: • Linear • Easily obstructed

  3. Basin scale • Segment scale • Reach scale Fausch et al. 2002

  4. The Lower Weber River Flow

  5. The Weber River • Fragmented and degraded • Home to Bonneville cutthroat trout and bluehead sucker • Conservation agreement species

  6. Research Goals • Describe the BCT metapopulation structure • Contemporary • Historical • Determine factors limiting population viability and persistence • Connectivity

  7. Objectives • Characterize lower Weber River BCT metapopulation • Determine if fluvial life-history expression is still present • Investigate barrier permeability

  8. Sampling Methodology • Electrofishing • Raft, canoe, backpack • Seines / nets • Picket weir • Mark-recapture

  9. Obj 1: Characterize lower Weber River BCT metapopulation • Compare tributaries and mainstem • Population size • Mark-recapture • Population structure • Length-frequency

  10. Mainstem and Tributary Comparison • Population size structure differences • Potential source-sink metapopulation dynamics • ─ Limited recruitment in mainstem?

  11. Source-Sink Metapopulation Source Sink Flow

  12. Source-Sink Metapopulation Source Sink Flow

  13. Objectives • Characterize lower Weber River BCT metapopulation • Determine if fluvial life-history expression is still present • Investigate barrier permeability

  14. Determine if fluvial life-history expression is still present • Mark-recapture • Passive PIT antennas • Importance: Connectivity • Spawning • >330 mm TL potentially Fluvial

  15. Population Size Structure • Fluvial BCT! • ─ resident fish in tributaries would not get this large • Large fish below barriers

  16. Objectives • Characterize lower Weber River BCT metapopulation • Determine if fluvial life-history expression is still present • Investigate barrier permeability

  17. Obj. 3: Investigate Barrier Permeability • Document location of barriers • Type, height, velocity • Mark-recapture • above and below • Picket weir

  18. N Ogden Flow

  19. N Ogden Flow = mainstem

  20. N Ogden Flow = mainstem = tributary

  21. Strawberry Movement Example Ogden • Marked 2 ripe fish >350 mm TL in tributary

  22. Strawberry Movement Example Ogden • Recaptured in mainstem • Barrier disrupted spawning?

  23. Preliminary Results 2011 • Population estimate section 04 • 704 (475-1098 +- 95% CI) • Population size structure • Mainstem • Tributaries • Identified 3 mainstem and 7 tributary barriers

  24. Summary • Barriers are a potentially limiting factor • Limited connectivity • Fluvial life-history expression prevails

  25. Management Implications • Allow managers to focus restoration efforts where they will be most effective • Guide habitat connectivity restoration • Barrier removal • Assist with the development of an effective conservation strategy for both species

  26. Thank you! • UDWR Northern Region and Salt Lake • Advisor: Phaedra Budy • FEL • Trout Unlimited • PacifiCorp Energy • UDOT • Weber Basin Water Conservancy District

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