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Kangaroos

Kangaroos. Coral reef spawning http://video.nationalgeographic.com.au/video/animals/invertebrates-animals/other-invertebrates/coralreef_spawning/. Review. a sexual OR sexual reproduction. Gender system. Sexes exist as separate male and female Hermaphrodite

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Kangaroos

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  1. Kangaroos

  2. Coral reef spawning • http://video.nationalgeographic.com.au/video/animals/invertebrates-animals/other-invertebrates/coralreef_spawning/

  3. Review asexual OR sexual reproduction

  4. Gender system • Sexes exist as separate male and female • Hermaphrodite • Parthenogenesis (babies produced from unfertilized eggs)

  5. Mode of fertilization • External • Internal

  6. Mating systems • Single pair matings • Multiple matings of individuals • Polygamy: polygyny, polyandry • promiscuity

  7. Monogamy • The survival of the young depends on both parents. • What for? • Partners for the breeding season, or partners for life?

  8. Polygamy • Polyandry • Polygyny

  9. Polygyny 2% of bird species • Harem polygyny 1 dominant male (bird) in a group of females. • Serial polygyny 1 male attracts passing females. Lekking

  10. Greater sage-grouse lek

  11. Polyandry <1% of bird species • Female is often larger and more brightly coloured. • Male is in charge of the incubation, the female moves on.

  12. Review- black bears hibernating • http://www.youtube.com/watch?v=ZFb_P2vZ0kc&list=PLF04FA11112E35C04

  13. Numbers of offspring • Quick and many (r- selection) • Slower and fewer (K- selection) Why?

  14. Eggs vsliveborn young • Oviparity Eggs are released and embryos develop outside the body. • Viviparity Embryos develop within the mother’s body and are born as miniature copies of the adult.

  15. Types of eggs • Reptile and bird eggs • Fish eggs

  16. Parental care or not? Interesting cases; Emperor penguin Australian mallee fowl Australian marsupials • Many animals guard eggs, and feed their young after they hatch. • ALL mammals care for their young for some period of time after birth.

  17. When do matings occur? • In many animals- just before each fertilization event. • Some animals have breeding seasons. • Spawning season, mating season. • Can depend on environmental conditions.

  18. Reproduction in plants • Occurs with pollen transfer. • Pollen may be transferred between plants by the following means; • http://australia.twig-world.com/films/plant-life-cycles-sexual-reproduction-1191/

  19. Seed dispersal

  20. Practice questions • P388 Quick checksea • P416 Q5 r&K • P393 Quick checkmating systems • P395 Quick check r&K • P399 Quick check eggs

  21. Homeostasis review Homeostasis is… • The condition of a relatively stable internal environment maintained within narrow limits.

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