amphibians and reptiles of the narrow river watershed › documents › 2017_02_26...threats to...
TRANSCRIPT
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Amphibians and Reptiles of the Narrow River Watershed
Nancy Karraker, Associate ProfessorDepartment of Natural Resources Science
University of Rhode Island
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Outline of Today’s Talk
• Biology and habitats
• Importance to ecosystems
• Threats to populations
• RI amphibians and reptiles
• Research and conservation in the Narrow River Watershed
• How you can get involved
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What are Amphibians and Reptiles?Ectothermic – do not generate heat from metabolism
Amphibians:• Smooth, moist skin• Capable of ‘drinking’ and respiring through skin• No claws on toes
salamanders and newts
frogs and toads caecilians
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What are Amphibians and Reptiles?Ectothermic
Reptiles:• Rough, scale-covered skin• Drink water through their mouths• Claws on toes
lizardssnakes turtles
crocodilians
tuatara
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World Diversity
10,000 species of reptiles6,000 species of amphibians
Thousands more not yet described?
Darwin’s frogsChile, Argentina
Shingleback lizardsAustralia
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Why study amphibians and reptiles?
• Interesting• Attractive• Important ecological roles (Why should you care?)
Gastric-brooding frogsAustralia
Red-backed salamandersEastern US
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Threats to Amphibians and Reptiles~30% of amphibians are threatened, especially frogs~40% of reptiles are threatened, especially turtles
• Habitat destruction• Disease• Pollution• Climate change• Invasive species• Collection for food, pets, medicine
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Amphibians of Rhode Island
• 8 species of salamanders
• 10 species of frogs
Inhabit streams, ponds, forest floor, soils
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Salamanders of Rhode IslandPonds, pools Streams Forest floor
Dusky salamander
Four-toed salamander
Red-backed salamanderTwo-lined salamander
Spring salamander
Red-spotted newt
Marbled salamander
Spotted salamander
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Salamanders in Narrow River WatershedPonds, pools Streams Forest floor
Dusky salamander
Four-toed salamander
Red-backed salamanderTwo-lined salamander
Spring salamander
Red-spotted newt
Marbled salamander
Spotted salamander
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Gyrinophilus porphyriticusNorthern spring salamander
RI Species of Concern
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Frogs of Rhode IslandVernal pools
Wood frog
Spadefoot toad
Spring peeper
Permanent ponds
American toad
Fowler’s toad
Gray treefrog
American bullfrog
Green frog
Pickerel frog Northern leopard frog
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Frogs in Narrow River WatershedVernal pools
Wood frog
Spadefoot toad
Spring peeper
Permanent ponds
American toad
Fowler’s toad
Gray treefrog
American bullfrog
Green frog
Pickerel frog Northern leopard frog
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Animal Quiz!
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Scaphiopus holbrookiiEastern spadefoot toad
State Endangered
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Reptiles of Rhode Island
19 total species
7 species of non-marine turtles
12 species of snakes
No lizards
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Turtles of Rhode IslandPonds, pools Streams, rivers Forest
Spotted turtle
Common snapping turtle
Musk turtle
Painted turtle Wood turtle
Estuaries and Salt Ponds
Eastern box turtle
Diamondback terrapin
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Turtles in Narrow River WatershedPonds, pools Streams, rivers Forest
Spotted turtle
Common snapping turtle
Musk turtle
Painted turtle Wood turtle
Estuaries and Salt Ponds
Box turtle
Diamondback terrapin
? ?
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Spotted turtleRI Protected Species
Wood turtleRI Species of ConcernRI Protected Species
Eastern box turtleRI Protected Species
Diamond-backed terrapinRI State EndangeredRI Protected Species
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Snakes of Rhode IslandWetlands Forest
Common garter snake
Smooth green snake
Black racerEastern milk snake
Northern brown snake
Ribbon snake
Eastern hognose snake
Northern water snake
Northern redbelly snake
Woodland edge
Black rat snake
Northern ringnecksnake
Eastern worm snake
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Snakes in Narrow River WatershedWetlands Forest
Common garter snake
Smooth green snake
Black racerEastern milk snake
Northern brown snake
Ribbon snake
Eastern hognose snake
Northern water snake
Northern redbelly snake
Woodland edge
Black rat snake
Northern ringnecksnake
Eastern worm snake
?
?
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Eastern ribbon snakeRI Species of Concern
Eastern hognose snakeRI Species of Concern
Eastern worm snakeRI Species of Concern
Extinct in Rhode IslandTimber rattlesnake
RI State Historical (1972)RI Protected Species
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Research and Conservation in the Narrow River Watershed
• Responses of spotted turtles to creation of early-successional habitat (Narrow River Land Trust)
• Mapping vernal pools in RI (Canonchet Farm)
• Creating wetland habitats for endangered spadefoot toads (in planning)
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Research on Amphibians and Reptiles in Rhode Island
Effects of forest loss on turtles and amphibians Scott Buchanan, PhD studentAllen Hamilton, MS student
Vernal pool mappingPriyanka PatelAlyssa Peterson Stefan Bengtson
All MESM students
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Research Question
How does management of forests for early-successional habitat affect the spotted turtle?
1. Frequency of movements
2. Distances moved
3. Areas used
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Why the Spotted Turtle?
• Spend 50-75% of time out of wetlands and in forest
• Feed on earthworms and other moist forest invertebrates
• Make frequent movements between upland and wetland
• Known to be sensitive to forest disturbance
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Narrow River Land Trust
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MethodsTrapped spotted turtles in several wetlands in 2013
5 males4 females
Attached radios and released in same locations
About 7 acres cut in winter 2013-2014
Tracked turtles April – October 2013 and 2014
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Turtle Locations
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Movements of Turtle 911 Before Cut
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Results and Conclusions
• Home range 16% larger post-cut (3.0 to 3.5 acres)• Potentially needed to travel farther to avoid open
areas or to obtain resources
• Turtles spent 85% of time in wetlands pre- andpost-cut• Abundance of wetlands on the site may result in
less use of uplands
• Creation of early-successional habitat may be compatible with maintaining spotted turtle populations if wetlands are abundant
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Mapping Vernal Pools
• Vernal pools difficult to identify by aerial photos
• Receive little protection by RI wetlands laws or federal wetlands laws
• Statewide project to locate vernal pools
• Goal: raise public awareness and increase protection
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What is a vernal pool?Ephemeral pool, temporary pool, seasonal pool
• Dries up annually (hydroperiod < 12 months)
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Vernal Pool Indicator Species
Marbled salamander
Spotted salamander Wood frog
Fairy shrimp
Obligate
Spotted turtle
Facultative
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Mapping Vernal Pools
• Compiled database of about 1,500 records of potential vernal pools in RI
• Visit pool in spring, search for indicator species, photograph pool
• Visit again in August, check to see if pool is dry, photograph pool again
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RI Results to Date
• Assessed nearly 300 potential vernal pools
• About 75% are actually vernal pools
• Mapped locations
• Added photographs and species lists to database
• Adding new potential vernal pools to database
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Canonchet Farm Results
• Assessed 5 potential vernal pools
• Found wood frog egg masses in 5 of 5
• Found spotted turtles in 1 pool
• No fairy shrimp• No marbled salamanders • No spotted salamanders
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Canonchet Farm ResultsPresent• wood frogs • spotted turtles
Not detected• marbled salamanders • spotted salamanders
Frogs and salamanders need forested area of 290 yards around breeding site to maintain population
Has there always been enough forest on and around Canonchet Farm to protect these animals?
Hint: It was a farm…
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290 yard buffer on a vernal pool
1939
2014
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290 yard buffer on a vernal pool
1939
2014
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Canonchet Farm Conclusions
Extensive forest disturbance probably eliminated spotted turtle, wood frog, spotted salamander, and marbled salamander populations by 1939
Differences in dispersal capability: wood frogs and spotted turtles recolonized; salamanders have been unable
Solutions?
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Creation of Spadefoot Toad Pools• Only one known breeding site remains in RI• Few populations remain in MA and CT
• We will lose this animal in the state if something is not done
• Assessing feasibility of creating pools in RI
Scaphiopus holbrookiiEastern spadefoot toad
State Endangered
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Currently partnering with: • South Kingstown Land Trust• Barrington Land Conservation Trust
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Designing Pools for Spadefoot Toads
• Designing 2-3 pools each with wetlands consultant in April
• Pending approval from land trust boards, pools will be built in August or October
• Pending approval from state agencies, translocation of tadpoles to new sites
• Goal: Ensure we keep spadefoot toads in RI where they belong!
Tom Biebighauser
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How can you help?
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Protect Wetlands in Your Community
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Help Amphibians and Reptiles Cross Roads
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Share Your Vernal Pool with Us!If you have a vernal pool and want it to be part of our project, let me know!
Nancy Karraker: [email protected]
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Wanted:Observations of Eastern spadefoot toads in RI
If you see or hear one, please contact me at URI
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Acknowledgments
• Kathie Kelleher and Rosemary and David Smith for inviting me and arranging my talk
• Narrow River Land Trust and Friends of Canonchet Farm for allowing us access to your beautiful lands
• Graduate students and undergraduates who have helped with research