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You\'ve got Snail - summary presentation by students
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Everglades TripYou’ve got
SNAILRecent invasion of the Everglades by Pomacea insularum
Matthew TrawickAlexis KropfVanessa Toro
• INVASIVE SPECIES
• THREATS of EIS
• CONTROL EFFORTS
• P. insularum & exotic macrophytes
• Armand Bayou
• Research
• P. insularum & native macrophytes
• P. paludosa & Endangered predators
• Federallocal interest
What is an EIS?
• Invasive • Exotic• Impacts–Economic–Ecological
Snails…Where did they come from?
We’ve Got Snail
Why eggs?
• Egg stage bottleneck to adult stage
• Vibrant colors
• Laid on emergent vegetation
• Species identification
• More accessible than snails
From Rawlings et al. 2007
Predicting Molluscan Invasions
Keller et al. 2007
Fecundity of
Pomacea canaliculat
a
- Scattered distribution - Dispersed distribution-Exotic oviposition preference -Native oviposition preference
X2 = 12.5p<0.001
- Introduced 2002 - Introduced 2005
Where were we? Where were the snails?
?
Impoundments
• INVASIVE SPECIES
• THREATS of EIS
• CONTROL EFFORTS
• P. insularum & exotic macrophytes
• Armand Bayou
• Research
• P. insularum & native macrophytes
• P. paludosa & Endangered predators
• Federallocal interest
Exotic vs. Native
• P. insularum (exotic)
• Average eggs per clutch– 1,626
• Tolerant to water stress
• P. paludosa (native)– Average eggs per clutch
• 10 to 80
• Invasive snail in FL~ 1100
• Intolerant to water stress
• Density effects (Conner et. al. 2008)
Predators
• Alligators (?)• Crayfish- hatchlings • ? ? ?
• Limpkin • Everglade Snail Kite
(endangered)• Alligators
• INVASIVE SPECIES
• THREATS of EIS
• CONTROL EFFORTS
• P. insularum & exotic macrophytes
• Armand Bayou
• Research
• P. insularum & native macrophytes
• P. paludosa & Endangered predators
• Federallocal interest
Management: Local
• ARM Loxahatchee National Wildlife Refuge– Government funded– Pest Management Plan
and Partnerships– Volunteers– Research
• Armand Bayou Nature Center– Private non-profit– Informal Research
Management: State
• Florida Department of Agriculture
• Florida Fish and Wildlife Conservation Commission
• Texas Parks and Wildlife Department
Management: National
• National Park Service– Everglades National Park
• US Department of the Interior– US Fish and Wildlife
Service• National Wildlife Refuge
System– Balancing management
(primary purpose) and recreation (revenue)
• Varying water levels
• Endangered, native species
• Extent of spread
• Limited Involvement of governmental institutions
• Urban areas• Pet trade• Ignorance• Connected waterways
Challenges to
Snail Removal
Ongoing Research in the Everglades
• Basic trapping methods•Density calculation• Exotic versus native
densities• Effects of drought• Extermination
measures
http://snailbusters.files.wordpress.com
Effect of inundationWater stress reduces hatching efficiency in newly laid clutches
Clutch Age and Inundation
Future Researchat Southwestern
• Alexis– Correlating egg clutch size with mass (and age) of female snails– Ability to age a population
• Megan– Contrasting herbivory resources of varying nutrients
• Brandon– Predation of hatchlings by various predators
• Olivia– Role of ovorubin in reducing egg predation
Got snail?
Hopefully not.
Acknowledgements• Dr. Burks• Southwestern University• Jeff Klein• Matt Harwell• Nate Dorn• ARM Loxahatchee Wildlife Refuge
– Rebecca, Matt, Tiffany• Austin Airport Security
