GEOS 212 1st edition Lecture 25Outline of last lectureLECTURE 24 OUTLINE (Whales and Dolphins – 23 April 2015)Types of whales (baleen versus toothed)Commercial whaling through timePresent status of whalingOrca and DolphinsEcholocation- Top predators- Special adaptations (intelligence, communication skills, strategies)Video on baleen whales & whaling(Life in the Sea 20:00-31:35) (5:08 to 16:39)- 2 traits of mammals- Origin of whales – when and why?- 2 kinds of whales- 3 controls on where whales occur?- Prehistoric hunting of whales- Early commercial hunting- Modern commercial hunting- What happened in 1986?Video on Killer Whales- What are they hunting?- Size & structure of each pod- Use of sonar?- How communicate with each other?- Strategies developed to catch prey- How many fish consumed per day?Dolphin clips- How does echolocation work- Dolphin communication through aggression- Swimming skillsOutline of Current Lecture:LECTURE 25 OUTLINE (Deep Sea & Hydrothermal Vent Communities– 28 April 2015)These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Life Zones (profile view: Photic; Twilight; Dark)Twilight zone (54:03- 1:00:50):- Sperm whale -- depth of squid?- Changes with depth?- Main strategy of most animals at depth:- Huge eyes – why needed?- Why no hard body parts needed at depth?- Use of stinging cells- Use of bioluminescence to avoid predation frombelowDark zone (1:00:50-1:16:10)- Why large eyes not needed at depth?- Predation strategy of Fangtooth- Why is red color an advantage?- Another method of detecting prey- Predation strategy of Gulper Eel?- How is bioluminescence produced?- #1 reason for bioluminescence- #2 reason for bioluminescence- Unusual mating strategy of male Angler Fish- Blue headlights- Advantage of red headlights- #3 reason for bioluminescence- depth charges!- What is the largest migration on planet, and why does it occur?- Photic zone description- Food source of most organisms that live below 150 metersMid-ocean ridge (1:31:15-1:36:43)- Dimensions of MOR- When explored for first time?- Temperature of water?- List of organisms seen at vents:- How is energy acquired?- Why is mobility required?- Potential origin of life on earth?Current
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