amphibians! - behs science homebehsscience.com/miller/zoo b/documents/amphibians.pdf · bone...
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They are coolAMPHIBIANS!
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�Stronger skeleton- more rigid vertebrae
�Pelvis
�Mobile neck
�No operculum
HOW ARE THEY DIFFERENT THAN FISH?
�No operculum
�Limbs with digits
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�Gas exchange
�Amphibians use skin and lungs
�Water supports the body, air does not
�Freshwater amphibians gain water
WHAT ARE THE CHALLENGES OF LIVING IN
TWO PLACES?
�Freshwater amphibians gain water
�Osmoregulation
�Evaporation
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1. Move back and forth between water and land
or live one stage of life in water and the other
on land
2. Tetrapods- 4 muscular limbs and feet with
toes or fingers
KEY CHARACTERISTICS OF AMPHIBIANS:
toes or fingers
3. Skin that secretes mucus
4. Lacking scales, feathers or hair
5. Larvae are aquatic and go through
metamorphosis- gills as juvenile and lungs as
adult
6. 3 chambered heart
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THERE ARE ALWAYS EXCEPTIONS!
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�Anura – frogs and toads
�Caudata- salamanders and newts
�Gymnophiona – caecilians
TYPES OF AMPHIBIANS
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� Sarcoptyerygians
� Ictheostega
WHERE DID AMPHIBIANS COME FROM?
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�About 3000 living species
�Live on every continent but Antarctica
�What do you think is cool about amphibians?
FUN FACTS
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� Utah DNR
AMPHIBIANS OF UTAH
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� You only need to write the main bullets
JUST SO YOU KNOW
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�The Importance of Skin
�Protection
�Microorganisms, UV light, desiccation, injury
�Gas exchange
CHARACTERISTICS OF AMPHIBIANS
�Gas exchange
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�The Importance of Skin
�Temperature regulation
�Absorption and storage of water
CHARACTERISTICS OF AMPHIBIANS
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�The Importance of Skin
�Chemicals
�Prevent drying, produce toxic chemicals
�Coloration
CHARACTERISTICS OF AMPHIBIANS
�Coloration
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�Larvae are herbivores
�Adults are carnivores
�Eat invertebrates
�Frogs can eat birds, mammals
FEEDING AND DIGESTION
�Frogs can eat birds, mammals
and other frogs
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�Most catch prey by sight
�Aquatic salamanders and caecilians use smell
�Frogs have modified tongue
�Anterior and flick
FEEDING AND DIGESTION
�Anterior and flick
�Sticky
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�External gills in larvae
�Some adults retain them
RESPIRATION AND GAS EXCHANGE
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�Gills are replaced by lungs
�Mouth forces air into the lungs
�Moist skin allows oxygen to diffuse
RESPIRATION AND GAS EXCHANGE
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� 3 chambered heart with circuit to lungs and skin
� Efficient for getting oxygen to cells\
� Some mixing of blood
CIRCULATION
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�Heart can change amount
of blood pumped to the
lungs
�Why could this be helpful?
ADAPTATIONS FOR A DUAL LIFE
�Why could this be helpful?
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�When in water or mud gas exchange happens only
through the skin
�Hibernation
CIRCULATION AND GAS EXCHANGE
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�Modified to counteract gravity - thicker
� Attach powerful muscles
� Flat skull - lighter
� Jaw- for chewing and crushing
SKELETON AND MOVEMENT
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�Spine –supports anterior and posterior ends
�Specialized vertebrae prevent twisting
� Cervical, Sacral
SKELETON AND MOVEMENT
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� Bones have joints
� Shoulder, hip, elbow, knee, wrist, ankle,
� Bone patterns similar to lobed fin fish
SKELETON AND MOVEMENT
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� Reduced muscles in body wall; appendage muscles
enhanced
�Modified movements
� salamander, frog, caecilians
SKELETON AND MOVEMENT
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�What are their senses?
NERVOUS SYSTEM AND SENSES
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�Vision- large eyes
�Binocular vision with depth perception
�Cells for color vision
�Nictitating membrane and eyelid
NERVOUS SYSTEM AND SENSES
�Nictitating membrane and eyelid
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�Hearing and vibrations
�What is sound?
�Hearing is an adaptation to land life
NERVOUS SYSTEM AND SENSES
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�Air vibrations- tympanic membrane
�Middle and inner ear; bones transfer vibration
� Inner ear: rotation and balance
� Acceleration/deceleration (like fish)
NERVOUS SYSTEM AND SENSES
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�Ground vibrations - appendages pass vibrations
to inner ear bones
�Some anurans use muscles to lock bones in place
� Shuts their hearing off
� Salamanders have no membrane or middle ear
NERVOUS SYSTEM AND SENSES
� Salamanders have no membrane or middle ear� What could this tell us about them?
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�Lateral line – in larvae and adult aquatic
salamanders
�Sense vibrations in the water and water movement
NERVOUS SYSTEM AND SENSES
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�Smell and taste: nose, mouth and tongue
�Recognize food, mate, danger
�Sensory receptors in skin
NERVOUS SYSTEM AND SENSES
�Sensory receptors in skin
�Heat, cold, pain
�Temperature regulation by behavior – cold blooded
�Examples of behavior: Being nocturnal, burrowing
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�Maintaining water balance (osmoregulation) is the biggest challenge
�Extra water is gained in freshwater
�Water is easily lost on land
EXCRETION AND OSMOREGULATION
�Water is easily lost on land
�Amphibians don’t drink or have kidneys that recapture water
�Warts reduce water loss
�Water is conserved by behavior
�What is a behavior that conserves water?
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�Dioecious- many have external fertilization
�Eggs with no covering – must be in water
REPRODUCTION AND DEVELOPMENT
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� Amphibians show courtship behavior
� Anurans use vocalization
�Why is vocalization a great adaptation?
REPRODUCTION AND DEVELOPMENT
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�Frogs and toads: amplexus
�Male grasps female; both release gametes
REPRODUCTION AND DEVELOPMENT
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�Salamanders: males make sperm packets and
leave them on the ground
�Female decides whether or not to accept it
REPRODUCTION AND DEVELOPMENT
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�Caecilians have internal fertilization and
development
REPRODUCTION AND DEVELOPMENT
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� Amphibians have many
adaptations for parental care
of their offspring
� Internal fertilization
�Watching eggs -protection
REPRODUCTION AND DEVELOPMENT
�Watching eggs -protection
� Aerating, cleaning and
moistening eggs
� Removal of dead or infected
eggs
�What are the positive benefits
of parental care?
�Negatives?
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�Amphibians have many
adaptations for parental
care of their offspring
�Eggs on the back
REPRODUCTION AND DEVELOPMENT
�Eggs on the back
�Brood in stomach
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�Metamorphosis
� What is it?
� What are the changes?
� What life processes are affected?
REPRODUCTION AND DEVELOPMENT
� Sketch what happens
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�Metamorphosis
�Tadpole is the larvae
�Major changes in
respiration, movement,
REPRODUCTION AND DEVELOPMENT
respiration, movement,
body shape and diet
�Tail fin lost; frogs lose tail
�Gills reabsorbed
�Limbs and lungs develop
�Some salamanders keep
tadpole characteristics into
adulthood
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�
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�
METAMORPHOSIS
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� Purple frog
� Turtle Frog
� Hellbender
UNIQUE AMPHIBIANS
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