Lecture 22

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Author:
rcornelio
ID:
247191
Filename:
Lecture 22
Updated:
2013-11-16 21:33:53
Tags:
amphibians
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  1. Describe  the world of amphibia in particular anura
    • Three orders in the amphibia :
    • Anura (frogs and toads)
    • order Caudata newts & salamanders
    • order Gymnophiona caecilians
    • Most lay eggs without shells , water dependent and glandular skin
    • Anura : 4 families southern frog, tree frog,tiny tree frog,true frog
  2. Describe Myobatrachidae : Southern frogs
    • Many are burrowing
    • some are fully aquatic others terrestrial
    • i.e Banjo frog common in south east Asia makes a bonk sound
    • Turtle fog: strictly terrestrial no acquatic phase found in termite mounds or burrows
  3. Describe Halidae :
    • world wide species but nest in oz and s.america 
    • typically water dependent mode of reproduction 
    • adapted to extreme arid zones and rain forest
    • Lironia : tinny , flat , but sound big
    • cycloriana : in arid zones, cocoons itself in its skin, only comes out to breed if rain is heavy enough to penetrate soil can old excessive amounts of water in bladder
  4. Tiny tree frogs
    • typical northern Australia distribution
    • 1-3 cm
    • direct development no tadppoles
    • less diverse 
    • can live in trees
    • i.e nursery frog : lays eggs in moist solid under rocks , eggs coated in an anti-fungal agent, tadpole develops in egg froglet hatches out 
    • rare and restricted distribution
  5. Describe ranidae
    • most successful frog 
    • native to png
    • and aus 
    • wood frog /water frog found in rain forest in dense vegetation
  6. bufonidae
    • cane toads
    • introduced
    • lay enormous batches of eggs
    • poisonous glands
    • frog , tadpole , egg are all poisonous: milky poison released by glands behind eyes
    • no suckers
    • skin dry
    • heavy built
  7. Distribution of frogs
    • Myobatrachidae : Gondwanan
    • Halidae: gondwanan
    • Mycrohalidae: asian
    • Ranidae: asian (recent)
    • Bufonidae: introduced
  8. Reproduction
    +
  9. why are frogs in trouble
    • climate change
    • habitat loss/ fragmentation
    • disease chytrid
    • fungus
  10. What do gastric brooding frogs do
    • females lay eggs ad swallows them , they then grow in the
    • stomach and then pop out of her mouth

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