missouri bladderpod lesquerella filiformis rollins n.
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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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missouri bladderpod
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)
local concerns
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?
monitoring objectives
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
abundance estimates
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
slide8

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
grid based census
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
grid based census1
Grid-based census

Annual brome

Missouri bladderpod

Red cedar

grid based census3
Grid-based census
  • directional error - consistent underestimation
  • only tested in years of low abundance
adaptive cluster sampling
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
slide16

Stratified Random Sampling

Two-Stage Adaptive Sampling

solution
Solution?
  • reduction of variance
  • confidence in abundance estimates
  • comprehensive snapshot of spatial abundance patterns
  • ability to map and monitor changes in core habitat
demographic monitoring
Demographic monitoring

photo: K. Mlekush

slide21

Demographic monitoring

photo: K. Mlekush

understanding missouri bladderpod life cycle
Understanding Missouri bladderpod life cycle

viability

Seed bank

germination

reproduction

Mature plants

Germinated seedlings

survival & growth

most transition rates depend on microhabitat
Most transition rates depend on microhabitat

viability

Seed bank

germination

reproduction

Microhabitat

Mature plants

Germinated seedlings

survival & growth

estimated geometric loss of seed viability
Estimated geometric loss of seed viability

data source: Thomas and Jackson 1990

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