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Wildlife Monitoring

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Constant effort butterfly survey. Relative abundance and ... Riparian obligate butterflies. Mourning cloak. Acadica hairstreak. Golden skipper. Red admiral ... – PowerPoint PPT presentation

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Title: Wildlife Monitoring


1
Wildlife Monitoring
  • Saltcedar Leaf Beetle Release
  • Colorado
  • Larry White
  • Bureau of Reclamation, Denver

2
Saltcedar good or bad.
3
Purpose and Objectives
  • Commitment of environmental assessment
  • Fish and Wildlife Service recommendation
  • Detect early warning signs of impacts
  • Determine changes in wildlife populations

4
Methods
  • Emphasis on breeding birds
  • Neotropical migratory and riparian obligate
    species
  • Butterflies
  • Riparian obligate species
  • Bats

5
Study Plots
  • Affected - Near Release site (Downstream)
  • Saltcedar/meadow ground zero
  • Cottonwood/saltcedar
  • Cottonwood/willow-saltcedar
  • Control - away from Release site (Upstream )
  • Cottonwood/willow and willow bar
  • Monotypic saltcedar
  • Willow-saltcedar
  • Saltcedar wetland

6
Avian Point Counts
  • Quantifies relative abundance and species
    composition of birds during breeding season
  • Sampling area 50 meter fixed-radius
  • 5 minute duration at each sampling point
  • 3 times from mid-May to-late June

7
Nest Monitoring
  • Determines productivity of breeding birds
  • Species of nesting birds
  • Percent nesting success and fledged/pair
  • Failure due to parasitism, predation, etc.

8
Constant effort butterfly survey
  • Relative abundance and species of adults
  • 3 times at staggered times of the day
  • Total of 8 hours per plot

9
Riparian obligate butterflies
  • Mourning cloak
  • Acadica hairstreak
  • Golden skipper
  • Red admiral
  • Viceroy
  • Tiger swallowtail
  • Wood nymph
  • others

10
Bat Surveys
  • Anabat II detector
  • Measures relative use per hour ( bat-passes per
    hour)
  • Release site and upstream control site

11
Vocal signature of big brown bat
battery
Detector and analysis module
12
RESULTS
  • Baseline data collection

13
Point counts
  • Placed birds in categories of increasing
    management concern and dependence on riparian
    habitat
  • All birds (45 species)
  • Neotropical migratory birds (23 species)
  • Riparian obligate songbirds (12 species)

14
Riparian obligate birds
  • Black-capped chickadee
  • Black-headed grosbeak
  • Blue grosbeak
  • Bullocks oriole
  • Common yellowthroat
  • Gray catbird
  • MacGillivrays warbler
  • Orchard oriole
  • Willow flycatcher
  • Yellow warbler
  • Yellow-breasted chat
  • Yellow-billed cuckoo

15
Point count calculations
  • Mean species of each category detected per
    point
  • Mean individual birds of each category detected
    per point
  • Eliminated swallows

16
ground zero
17

ground zero
18
ground zero
19
ground zero
20
Saltcedar Plots
  • Plots with saltcedar had birds of all categories
  • Saltcedar plots without natives including ground
    zero had lowest mean value of species and birds

21
Saltcedar-wetland plot
  • High values resulted from concentration of
    red-wing blackbirds and common grackles
  • Use by orioles and yellowthroats
  • Open water near saltcedar stands add habitat
    value for breeding birds

22
Native Plots
  • Plots dominated by native had higher mean values
    for neotropical migrants and riparian obligates
  • Values were less in 2001 when sites were not
    flooded
  • Native plots had breeding yellow-billed cuckoo
    and migrating willow flycatcher

23
Nest monitoring
ground zero
24
ground zero
25
ground zero
26
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28
Butterfly monitoring
  • butterflies per survey hour
  • riparian obligates per survey hour
  • Species richness of all butterflies
  • Species richness of riparian obligates

29
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32
Bat surveys
  • Total of at least 11 species foraging over
    saltcedar
  • Release site and saltcedar control sites had
    similar species composition
  • Activity ranges from 3.7 to 44.5 bat-passes per
    hour
  • Future studies will include native habitats

33
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34
Conclusions
  • Implications for saltcedar control

35
Saltcedar has habitat value
  • Ensure successful establishment of native
    vegetation at control sites
  • Monitor vegetation establishment and wildlife
    response
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