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Missouri bladderpod Lesquerella filiformis Rollins

Missouri bladderpod Lesquerella filiformis Rollins. photo: NPS archive. Missouri bladderpod. listed Federally Endangered in 1987 narrow endemic - 62 populations in 5 counties of sw Missouri and nw Arkansas threatened by habitat alteration and development

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Missouri bladderpod Lesquerella filiformis Rollins

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  1. Missouri bladderpodLesquerella filiformis Rollins photo: NPS archive

  2. Missouri bladderpod • listed Federally Endangered in 1987 • narrow endemic - 62 populations in 5 counties of sw Missouri and nw Arkansas • threatened by habitat alteration and development • winter annual - germinates in fall, flowers the following spring • population size fluctuates from year to year (some years none survive)

  3. Local concerns • five populations at WICR • encroaching woody vegetation due to fire supression • exotic species establishment • largest population at a site of great historical significance • how to manage for species and interpretive value simultaneously?

  4. Monitoring objectives • How does abundance fluctuate over time? • annual abundance estimates • Which factors are driving abundance changes? • weather data correlated with abundance • demographics sampling, habitat correlates • How is limestone glade habitat changing? • vegetation transects

  5. Abundance estimates • Stratified random sampling • data since 1988 • Grid-based census • developed during protocol design • data for 1997 - 1998 • Adaptive cluster sampling • simultaneous with protocol development • data for 1999 - 2001

  6. Stratified random sampling

  7. Stratified random sampling • 3 meter x 3 meter quadrats • spatially stratified across core area of the population • sample size of 31- 77 quadrats • tally all individuals within the quadrat, subsample for number of stems and fruits per individual

  8. Missouri bladderpod abundance

  9. Grid-based census • sampling grid covers entire glade, including unoccupied edge areas • visit every 5 x 5 meter grid cell • estimate number of individuals in each cell (log-scaled categories) • periodic calibration by counting all individuals after estimating • simultaneous collection of habitat data for each grid cell

  10. Grid-based census Annual brome Missouri bladderpod Red cedar

  11. Grid-based census

  12. Grid-based census • directional error - consistent underestimation • only tested in years of low abundance

  13. Adaptive cluster sampling • based on sampling grid, divided into primary units and secondary units (3 x 3 meters) • subset of primary units selected, random draw to select seed cell • if number of plants in seed cell > 9, adaptive sampling initiated in adjacent cells • record tally of individuals and habitat attribute data for each secondary unit sampled

  14. N Sampling grid for Missouri bladderpod

  15. Stratified Random Sampling Two-Stage Adaptive Sampling

  16. Methods comparison

  17. Solution? • reduction of variance • confidence in abundance estimates • comprehensive snapshot of spatial abundance patterns • ability to map and monitor changes in core habitat

  18. Missouri bladderpod implementation schedule

  19. Demographic monitoring photo: K. Mlekush

  20. Demographic monitoring photo: K. Mlekush

  21. Understanding Missouri bladderpod life cycle viability Seed bank germination reproduction Mature plants Germinated seedlings survival & growth

  22. Most transition rates depend on microhabitat viability Seed bank germination reproduction Microhabitat Mature plants Germinated seedlings survival & growth

  23. L. filiformis habitat is variable at small scales photo: K. Mlekush

  24. Survival rates by habitat type

  25. Freeze-thaw cycles

  26. Fecundity by microhabitat

  27. Seed production by microhabitat

  28. Seed replacement by microhabitat

  29. Estimated geometric loss of seed viability data source: Thomas and Jackson 1990

  30. Unfinished business • solidify the abundance estimate methods, apply to smaller populations • improved synthesis and reporting

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