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Discovering Amphibians: Engaging Educational Material

Learn about 3000 species of amphibians, their fascinating life cycles, unique features, and diverse habitats in this engaging educational material. Explore the transition between aquatic and terrestrial vertebrates, their reproduction methods, and their importance in ecosystems. From newts to frogs, delve into the world of amphibians with interactive content and vivid imagery.

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Discovering Amphibians: Engaging Educational Material

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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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