1 / 13

Reproductive strategies for Survival

Reproductive strategies for Survival. How many, and how often?. Eggs or liveborn young?. Oviparity. Viviparity. Types of viviparity are recognised by the nutrient source for the developing embryo. Activities.

jason
Download Presentation

Reproductive strategies for Survival

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Reproductive strategies for Survival

  2. How many, and how often?

  3. Eggs or liveborn young?

  4. Oviparity

  5. Viviparity Types of viviparity are recognised by the nutrient source for the developing embryo

  6. Activities Glossary: r selection, K selection, fecundity, oviparity, viviparity, amniote, placenta, mortality, monotreme Quick check questions: pg 383, 387.

  7. Parental care or not?

  8. Case studies – 1. Australian Mallee Fowl • Male invests energy into nest building – incubation mound made of rotting plant matter • Female invests energy into laying 12 to 24 eggs at once • Male incubates • Chicks hatch, do not require further care

  9. Case studies – 2. Emu • Polyandrous • Male is caregiver • He builds nest, incubates eggs, guards young • Female lays eggs and leaves to mate again

  10. Case studies – 3. Australian Marsupials

  11. Australian Marsupials • Placental mammals (not marsupials) have a long period of uterine development • In contrast, marsupials have a short period within the uterus, and a long period developing in the pouch • TURN TO PAGE 391 IN YOUR TEXT BOOK

  12. Australian Marsupials – arrested development • Kangaroos and wallabies can suspend development within the uterus • If kangaroo conceives while young is in pouch, she stops uterine development until pouch young is off the nipple in the pouch.

  13. Activities Glossary: cephalopod, marsupial, placental mammal Quick check pg 393

More Related