Ch. 3Ch. 3Sec. 3 AmphibiansSec. 3 Amphibians

Table Total # of toothpicks

# of green toothpicks

1 40 82 31 33 32 44 6 35 32 46 32 6

Camouflage Activity

What is an amphibian?What is an amphibian?

•ectothermic vertebratesectothermic vertebrates

`̀ 2 loop circulatory 2 loop circulatory

systemsystem 3 chambered heart3 chambered heart

–2 upper 2 upper chambers=chambers=atria atria receive bloodreceive blood

–1 lower chamber=1 lower chamber= ventricleventricle- pumps - pumps blood blood body body

amphibian= double lifedouble life

Amphibian reproductionAmphibian reproduction

• metamorphosis• egg tadpole (larva that swim & have gills) adults- lose gills & get lungs

A tadpole’s circulatory system A tadpole’s circulatory system has a single loop & a heart has a single loop & a heart with 2 chambers, like a fish.with 2 chambers, like a fish.

frogs & toadsfrogs & toads salamanderssalamanderseggs eggs

fertilizedfertilized externallyexternally internally internally

how obtain how obtain foodfood

wait for prey to wait for prey to come closecome close

(use camouflage)(use camouflage)

actively stalk actively stalk & ambush & ambush

preyprey

movementmovement 1. powerful hind 1. powerful hind leg muscles leg muscles

2. skeleton that 2. skeleton that can absorb shock can absorb shock

of landingof landing

crawlcrawl

Attributes of amphibians

frogs & toadsfrogs & toads

adapted for hopping & leaping:– strong skeletons– muscular limbs

Frogs have smooth, moist skin.

Toads have drier, bumpier skin than frogs. Many toads have large lumps behind their eyes that ooze a poisonous liquid when attacked.

Three groups of amphibiansThree groups of amphibians

red spotted newt

reasons for decreasingreasons for decreasingamphibian populationsamphibian populations

1.1. habitat habitat (specific environment in (specific environment in which an animal lives)which an animal lives) destruction destruction

2.2. poisons in environment- poisons in environment- insecticides pollute waterinsecticides pollute water• weaken adultweaken adult• kill eggs kill eggs • deform tadpolesdeform tadpoles

Golden frogs are rarely seen anymore in their native habitat —the rain forests of Panama.

What are two possible causes for the decrease in the number of golden frogs?

Discharge contaminated with coal combustion wastes.

Bullfrog tadpoles raised in a control habitat (A) and in an area contaminated with coal combustion wastes (B & C).

Vitamin A compounds in lake water may be at least partly responsible for frog deformities.

Effects of Effects of toxins in toxins in the the environmeenvironmentnt

Deformed frog photos

On the hunt for hellbenders…

Red Red Cheeked Cheeked

SalamanderSalamander

FROG, TOAD or FROG, TOAD or SALAMANDER ?SALAMANDER ?

FROG ,TOAD or SALAMANDER?FROG ,TOAD or SALAMANDER?

have smooth, moist skin

FROGFROG

FROG, TOAD or SALAMANDER?FROG, TOAD or SALAMANDER?

dry, bumpy skin

TOADTOAD

FROG, TOAD or SALAMANDER?FROG, TOAD or SALAMANDER?

keep their tails as adults

SALAMANDESALAMANDERR

FROG, TOAD or SALAMANDER?FROG, TOAD or SALAMANDER?

adapted for hopping & leaping

TOADTOAD

FROGFROG&&

FROG, TOAD or SALAMANDER?FROG, TOAD or SALAMANDER?

legs not adapted for jumping

SALAMANDESALAMANDERR

FROG, TOAD or SALAMANDER?FROG, TOAD or SALAMANDER?

Actively stalk Actively stalk & ambush & ambush

preyprey

SALAMANDESALAMANDERR

FROG, TOAD or SALAMANDER?FROG, TOAD or SALAMANDER?

external fertilization

TOADTOAD

FROGFROG&&

FROG, TOAD or SALAMANDER?FROG, TOAD or SALAMANDER?

drier, bumpier skin

TOADTOAD

Wait for prey Wait for prey to come closeto come close

(use (use camouflage)camouflage)

FROG, TOAD or FROG, TOAD or SALAMANDER?SALAMANDER?

TOADTOAD

FROGFROG&&

What is the first What is the first stage of the frog stage of the frog

life cycle?life cycle?

The first stage of The first stage of the frog life the frog life cycle is the cycle is the eggegg. .

What is the What is the second stage of second stage of

the frog life the frog life cycle?cycle?

The second stage of the frog life cycle is the tadpole.

What is the last What is the last stage of the frog stage of the frog

life cycle?life cycle?

The last stage of the frog life cycle is the adult frog.

1.Groups of amphibians1.Groups of amphibians 2.Reproduction and 2.Reproduction and DevelopmentDevelopment

3. Obtaining Oxygen3. Obtaining Oxygen 4. Circulatory System4. Circulatory System

frogs toads

salamanders

Front of paper

5. Obtaining Food5. Obtaining Food 6. Movement6. Movement

7. Amphibians in danger7. Amphibians in danger NameNameDateDateScienceSciencePictures of Ch. 3 Sec. 3 Pictures of Ch. 3 Sec. 3 SubheadingsSubheadings

Chemicals cause tadpoles to be deformed.

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