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AMPHIBIANS

AMPHIBIANS. Výukový materiál OR 03 - 74 Tvůrce: Mgr. Alena Výborná Tvůrce anglické verze: ThMgr. Ing. Jiří Foller Projekt: S anglickým jazykem do dalších předmětů Registrační číslo: CZ.1.07/1.1.36/03.0005 Tento projekt je spolufinancován ESF a SR ČR. AMPHIBIANS.

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AMPHIBIANS

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  1. AMPHIBIANS Výukový materiál OR 03 - 74 Tvůrce: Mgr. Alena Výborná Tvůrce anglické verze: ThMgr. Ing. Jiří Foller Projekt: S anglickým jazykem do dalších předmětů Registrační číslo: CZ.1.07/1.1.36/03.0005 Tento projekt je spolufinancován ESF a SR ČR

  2. AMPHIBIANS • transition between aquatic and terrestrial vertebrates • the oldest known amphibians – Trematosaurus: • they developed from Coelacantiformesthey reached up to 1 metre • at present 3000 species of amphibians

  3. AMPHIBIANS • larvae – tadpoles, breathing with outer gill, their stream organ is developed • adults – they breathe with lungs and skin • skin – bald, smooth, verrucous, mucus glands (the body surface is clammy), mucus glands sometimes transformed into poison, they sometimes shed their skin

  4. AMPHIBIANS • changeable body temperature = cold-blooded animals • digestive system – it ends by the cloaca (both kidney and reproduction system terminals join here)

  5. AMPHIBIANS • Reproduction: • Caudata: • males put their sexual cells in special capsule • females pick them up by the tip of cocoon = fertilization inside the female body (=internal fertilization) • They lay eggs on water plants individually, some of them give birth to living young ones

  6. AMPHIBIANS • Anura: • the male tacks on the back of the female (amplexus) • female releases eggs, male fertilizes them (=external fertilization) • they lay eggs in clusters (Pelophylax – pool frog, water frog), strings (toads)

  7. AMPHIBIANS • voice performance by the reproduction • tadpoles: • a long tail • frog tadpoles • hind legs grow first, front legs later • gill is hidden early • newt tadpoles • comb-like gill • front legs grow first

  8. AMPHIBIANS • food • animal (insects…) • colouring • protective • warning

  9. AMPHIBIANS - CAUDATA • spotted salamander: • night animal • deciduous, mixed forests • endangered, protected • newt: • it spends the most of the year in the water • common newt, mountain newt

  10. SPOTTED SALAMANDER

  11. NEWT

  12. AMPHIBIANS - ANURA • frogs • short dumpy body without tail • hind legs much shorter • web among the toes of hind legs • tongue – can be thrown far and is used for hunting of prey • the most frogs are adapted to the terrestrial life • eyelids • most frogs care about their eggs and about their young ones (common midwife toad)

  13. AMPHIBIANS - ANURA • Toads: • night frogs • dumpy body • verrucous skin • Fire-bellied toads: • small frogs • distinctive black–yellow coloration on the belly

  14. COMMON TOAD

  15. AMPHIBIANS - ANURA • Common toads: • slim frogs • most usual is common frog • apart from the reproduction they live in shady forests • Common spadefoot toad: • vertical pupils • anight frog • it digs out holes

  16. COMMON FROG

  17. AMPHIBIANS - ANURA • Tree frogs: • they live on trees or bushes • they move well on straight planes

  18. TREE FROG

  19. Review: • 1) The skin of amphibians serves as…………………. • 2) Amphibians belong to warm-bloodeed animals: YES NO • 3) Tadpoles breathe with ……………… • 4) How could a frog tadpole be differed from a newt tadpole? • 5) Which frog species can be found in our country?

  20. Source: • DOBRORUKA, Luděk J. Přírodopis pro 7. ročník základní školy. 1. vyd. Praha: Scientia, 1998, 152 s. ISBN 80-718-3134-4 • Obrázky: http://commons.wikimedia.org (osvobozeno od autorských práv)

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