effect of habitat structure on reproduction and prey capture of...
TRANSCRIPT
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Effect of Habitat Structure on Reproduction and Prey Capture of Pinguicula lutea
a Rare Carnivorous Plant
Samantha B. Primer, University of Illinois (UIUC) Brenda Molano-Flores, Illinois Natural History Survey
Jenna Annis, Eastern Illinois University Janice Coons, Eastern Illinois University
Mary Ann Feist, University of Wisconsin-Madison
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Habitat Modification
TIME
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Habitat Modification
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Plant-Insect Interactions
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Plant-Insect Interactions
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“This plant, commonly called Venus’ fly-trap…is one of the most wonderful in the world.”
Carnivorous Plants
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“This plant, commonly called Venus’ fly-trap…is one of the most wonderful in the world.”
Carnivorous Plants
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…But So Much More
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Pinguicula lutea
Family: Lentibulariaceae
Common Name: Yellow Butterwort
Status: Threatened in FL
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Habitat Structure
• Cover class determined (% cover) using Daubenmire method
• At each site, 5 1m2 quadrats were established along alternating sides of 30m transect.
• At each site, 10 buds were randomly marked, monitored for fruit development.
Maintained Grassy Woody
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Ellison graph instead
Pinguicula spp. Characteristics
nectar spur
anthers receptacle
stigma
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Ellison graph instead
Pinguicula spp. Characteristics
leaf margin
stalked gland sessile gland
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Overarching Question
Does habitat structure affect plant-insect interactions of Pinguicula lutea?
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Overarching Question
Does habitat structure affect plant-insect interactions of Pinguicula lutea?
Background Information:
1. Determine reproductive ecology
2. Survey arthropod abundance and prey capture
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Reproductive Ecology
Breeding System Pollinator Observations
Pollen : Ovule High Low
Previous Research
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Floral Morphology Suggest Insect vector Breeding System Self-compatible, pollen vector required Pollinator Observations Insect vector on video Pollen to Ovule Ratio Consistent with facultative selfing
Reproductive Ecology Summary
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Treat. 1876. The Harper’s Monthly. Gibson.1991. American Midland Naturalist.
Prey Community Previous Research
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Prey Community Summary
Prey Capture Main prey are Collembola and Diptera Collembola is most common Arthropod Availability Collembola and Diptera most abundant Some available Diptera too large trap
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Overarching Question
Does habitat structure affect reproduction and prey capture of Pinguicula lutea?
Background Information:
1. Determine reproductive ecology
2. Survey arthropod abundance and prey capture 1. Determine reproduction and prey capture in
three habitat structures
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Cover class determined (% cover) At each site, 5 1m2 quadrats were established along alternating sides of 30m transect.
• Reproduction
– Fruit Set – Seed Set
• Prey Capture • Prey Availability
• Total sites = 13
Sites = 13
1m2 quadrats established
Cover class determined (% cover)
Quadrats = 5
Vegetation Surveys
Determining Structure
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Determining Structure
Cover class determined (% cover) At each site, 5 1m2 quadrats were established along alternating sides of 30m transect.
• Reproduction
– Fruit Set – Seed Set
• Prey Capture • Prey Availability
• Total sites = 13
Maintained
Grassy
Woody
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Reproduction
Fruit Set Seed Set
N = 10
Sites = 13
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Fruit Set
0
0.2
0.4
0.6
0.8
1
maintained grassy woody
FinalFruitSet
Pro
po
rtio
n o
f Fr
uit
s Fo
rmed
ANOVA F = 0.57, P = 0.58
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0.75
0.8
0.85
0.9
0.95
maintained grassy woody
SeedSet
Seed Set P
rop
ort
ion
of
Seed
s Se
t
F = 1.54, p = 0.22
ANOVA:
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Habitat Structure on Reproduction
High fruit set
High seed set
Habitat structure does not affect reproductive success
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Prey Community Assessment
Prey Capture Arthropod Availability
N = 5
Sites = 13
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0
2
4
6
8
10
12
Total Collembola Diptera
Maintained
Grassy
Woody
Arthropod Availability M
ean
# A
rth
rop
od
s
0
2
4
6
8
10
12
Total ColembolaDiptera
Maintained
Grassy
Woody
F = 4.66, p = 0.01
F = 4.3, p = 0.02
F = 38.7,p
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Prey Capture M
ean
# A
rth
rop
od
s
0
1
2
3
4
5
Total Collembola Diptera
Maintained
Grassy
Woody0
1
2
3
4
5
Total Collembola Diptera
Maintained
Grassy
Woody
F = 26.0, p
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Habitat Structure on Prey Capture
Habitat structure does affect prey capture and availability
Microclimatic Conditions
Light Availability Temperature
Humidity
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Habitat Structure on Prey Capture
Habitat structure does affect prey capture and availability
Microclimatic Conditions
Light Availability Temperature
Humidity
Arthropods Trapping Mechanism
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Microclimate affecting insects Microclimate affecting trapping mechanism Temperature humidity moisture
Zamora.1995. Oikos.
F
Habitat Structure on Prey Capture
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So I’ve established the patterns of these plant insect interactions
Habitat Structure on Prey Capture
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In Summary….
• First comprehensive study of plant-insect interactions for SE
Pinguicula spp.
• In a fire dependent community these findings provide insight into how this species response to changes in habitat structure… i.e. What management or lack of management could mean for this species
• Provides evidence that’s presents or absence of management does not seems to have an impact in terms of reproduction; however there are differences in terms of prey capture.
First comprehensive study of plant-insect interactions for SE Pinguicula spp.
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In Summary….
First comprehensive study of plant-insect interactions for SE Pinguicula spp.
• In a fire dependent community these findings provide insight into how this species responds to changes in habitat structure… i.e. What management or lack of management could mean for this species
• Provides evidence that’s presents or absence of management does not seems to have an impact in terms of reproduction; however there are differences in terms of prey capture.
Provides insight into how this species respond to changes in habitat structure
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In Summary….
First comprehensive study of plant-insect interactions for SE Pinguicula spp.
Provides insight into how this species responds to changes in habitat structure
Presence/absence of management may impact prey capture.
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Acknowledgements COAUTHORS Brenda Molano-Flores Jenna Annis Janice Coons Mary Ann Feist BMF LAB Danielle Ruffatto David N. Zaya Ian Pearse Charlie Helm UNDERGRADUATE HELP Marialicia Chavez
FIELD ASSISSTANTS/ HELP Caroline George Jean Mendelkoch Kevin Christman Melissa Primer Bill Booth Robin Kennedy TYNDALL AIRFORCE BASE Wendy Jones ST. JOE COMPANY Jim Moyers MASTER NATURALISTS
FLORIDA FOREST SERVICE Michael Jenkins David Morse US FISH AND WILDLIFE Vivian Negron-Ortiz BUFFER PRESERVE Dylan Shoemaker Barry Townsend Sandra Chafin Allix North Lisa Duglecki Max & Pat Prucell Dave & Joy Peterson