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Reproductive Mechanisms in Australian Biota

Describe some mechanisms found in Australian fauna to ensure : Fertilisation Survival of the embryo and of the young after birth. Reproductive Mechanisms in Australian Biota. There are 2 mechanisms of reproduction available to Australian Flora and Fauna. Sexual reproduction

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Reproductive Mechanisms in Australian Biota

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  1. Describe some mechanisms found in Australian fauna to ensure:FertilisationSurvival of the embryo and of the young after birth

  2. Reproductive Mechanisms in Australian Biota • There are 2 mechanisms of reproduction available to Australian Flora and Fauna. • Sexual reproduction • Asexual reproduction

  3. Sexual Reproduction • For Australian populations to survive using sexual reproduction, they must have certain “reproductive mechanisms” that increase the chance of fertilisation, increase the chance of survival of their embryos (unborn), and increase the chance of survival of their young after birth

  4. Sexual Reproduction • To ensure fertilisation, sexually mature individuals need to be brought together • This process is called mating • Many factors influence mating behaviour: temperature, food, phases of moon, etc • Some adaptations of Australian species to ensure fertilisation include:

  5. Bower Bird • Bower Bird: They lack showy plumage, so the male decorates its nest with bright blue objects to attract the female. They have elaborate courtship rituals

  6. Brolgas • Australian Brolgas: Performs an elaborate dance before mating

  7. Trout • Common Trout: They come together during the full moon of their mating season and release their gametes into the water

  8. Whales, Seals and Dolphins • Whales, Seals and Dolphins: All have internal fertilisation, where the male gametes are deposited directly into the female. They often have spectacular courtship rituals.

  9. Hilarious Teacher Joke...

  10. Adaptations to Increase Chance of Fertilisation in Australian Fauna Case Study 1: Monotreme reproduction: ECHIDNA Summary + Questions (page 260) Case Study 2: Marsupial reproduction: EASTERN GREY KANGAROO Summary Questions (page 261) Case Study 3: Marsupial reproduction: EASTERN WATER DRAGON Summary Questions (page 262)

  11. For each case study, answer the following questions: • Name the organism • Describe the environment that the organism lives • Very briefly, describe how the organism reproduces • What were the problems with the organism reproducing sexually • List the reproductive strategies that it uses to ensure that some of its gametes meet.

  12. To show how Australian Fauna have mechanisms to increase the survival of their embryos, and their young after birth, complete the following activity:

  13. Adaptations to Increase Survival of Embryo and Young in Australian Fauna Case Study 1: Monotreme reproduction: PLATYPUS Summary + Questions Case Study 2: Marsupial reproduction: KANGAROO Summary + Questions Case Study 3: Amphibian reproduction: GASTRIC BROODING FROG Summary + Questions

  14. For each case study, answer the following questions: • State whether the organism reproduces through internal or external fertilisation • Explain the “reproductive mechanisms” (adaptations) the organism has that enable it to increase the chance of fertilisation and survival of the embryo • Explain the “reproductive mechanisms” (adaptations) the organism has that enable it to increase the survival of the young after birth

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