Whales

699 views
643 views

Published on

Published in: Technology
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
699
On SlideShare
0
From Embeds
0
Number of Embeds
42
Actions
Shares
0
Downloads
13
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

Whales

  1. 1. Whales
  2. 2. Evolution• From land mammals• Related to horse and sheep
  3. 3. Temperature Regulation• Blubber – Also aids with buoyancy• Muscle movement generates heat• Body parts are not exposed to elements,instead are all tucked in
  4. 4. Oxygen• Blowhole on top of the head-better placement foranimals who spend time with head under water• Huge lungs that can fill/empty quickly (2 sec)• High gas exchange rate-whales absorb 90%,humans only absorb 2% of oxygen• Can slow heart rate & shunt blood from non-vitalorgans when diving
  5. 5. Anatomy• Streamlined• Adults – no hair• Internalized body parts(penis, mammary glands,ears) reduce friction• No hind limbs• Fluke = tail; up/down;used for identification
  6. 6. Senses• Echolocation – biological sonar• Excellent hearing – songs used for communication• Good eyesight (except in dark where echolocationis used instead)
  7. 7. Special Adaptations• Collapsible lungs for when diving• Nostrils stay shut while diving• Do not get “the bends” (accumulation of Nitrogenbubbles from diving)
  8. 8. Two Whale Types• Suborder Odontoceti –Toothed Whales• Suborder Mysticeti –Baleen Whales
  9. 9. Odontoceti – The Toothed Whales• Grab food with teeth, don’t chew• Chase/hunt food so can dive deeper than baleenwhales• Most don’t migrate and travel in Pods (groups)• Examples: Sperm, Orca, Pilot, Dolphin, Porpoise
  10. 10. Mysticeti – The Baleen Whales• No teeth – instead 600-800 baleen plates to filterkrill through accordion-like pleats under mouth• Their food lives nearer to surface, so they aren’tdeep divers• Examples: Blue,Humpback, Right
  11. 11. Reproduction• Internal fertilizationand development• Bear live young• Nurse young• Young growextremely quickly• Low birth weight
  12. 12. Behaviors• Breaching – jumping completely out of water• Spyhopping – face up out of water• Beaching – swimming up onto beach andoften dying when stuck there
  13. 13. IssuesWhaling:– Nearly wiped out many species– Was for food, oil, etc.– Marine Mammal Protection Act (MMPA) – banshunting/harassing marine mammals– International Whaling Commission (IWC) – makesregulations pertaining to whaling

×