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Conservation and Ecology of Marine Reptiles MARE 490 Dr. Turner Summer 2011

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Conservation and Ecology of Marine Reptiles MARE 490 Dr. Turner Summer 2011. Locomotion. Sea turtles depart functionally & morphologically from other turtles Locomotion & locomotor adaptations most unique characters Large size, hypertrophied phalanges, distinctive locomotion patterns.

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Presentation Transcript
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Conservation and Ecology of Marine Reptiles

MARE 490

Dr. Turner

Summer 2011

slide2

Locomotion

Sea turtles depart functionally & morphologically from other turtles

Locomotion & locomotor adaptations most unique characters

Large size, hypertrophied phalanges, distinctive locomotion patterns

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Locomotion

Due to rigid carapace – all propulsion from limbs

Terrestrial & Freshwater turtles alternate limb movements

Marine – use both forelimbs simultaneously

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Terrestrial Locomotion

Most hatchlings crawl by synchronous movement of diagonally opposite limbs

As increase in mass – locomotion becomes taxonomically dichotomous

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Terrestrial Locomotion

Most hatchlings crawl by synchronous movement of diagonally opposite limbs

Cheloniid Pattern

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Terrestrial Locomotion

Most hatchlings crawl by synchronous movement of diagonally opposite limbs

DermochelidPattern

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Terrestrial Locomotion

As increase in mass – locomotion becomes taxonomically dichotomous

Loggerhead, hawksbill, & Ridleys retain Cheloniid pattern

Green/black & flatback switch to Dermochelid pattern

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Aquatic Locomotion

Already reviewed marine turtle anatomical adaptations

Use life-based mechanisms for producing thrust

Flippers serve as wings & paddles

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Aquatic Adaptations

Modification of pectoral appendage from typical foot to modified flipper

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Popular Mechanics

Use forelimbs to provide thrust – synchronous flipper sweeps causes body to rock through + & - angles of attack

Lift-based mechanisms – apparatus act like wings to generate lift

Drag-based locomotion - generate thrust by rowing or paddling

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Popular Mechanics

Comparison of FW & Marine

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Hyper-Hypo

“I'm hypoglycemic and hyperactive. I'm a hyper hypo. That's why I wear a helmet.” – Phillip the hyper-hypo

Long-distance migrations accomplished during a hyperactive swimming frenzy & post-frenzy period

Large portion anaerobic – unable to hold head at surface while swimming in rough conditions