IB 41: Marine Mammals
Science asks three questions:
1. Whats there?
2. How does it work?
3. How did it come to be this way?
a. Example: how did the nose of marine mammals move to the top of their
heads, how did their jaws extend?
Science works in spe
- LOOK AT STUDY GUIDES!
- All different mammal groups (bears vs. badgers vs.
elephants vs. pigs and hippos)
- Baggage (diet, fur, dependence on terrestrial)
- Adaptation (Morphology) streamline,
- Carnivores: sea ott
Midterm II: Wednesday, October 31, 2012
Stellar Sea Cows do not die
Mysticete Whatles = carnivores
- Human ability to echolocate: Advantage or Baggage?
- Birds, bats (few), whales (odontecetes)other mammals that echo locate
Clicks in nasal pa
- Diet: Fish (Salmon) + Cephalopods (squid and such,
conflict with odontocetes?)
- CrabeatersPhocid (30 million in Antarctica)
o Teeth formation makes a filter to filter the
- Leopard SealsPhocids, snake like
o Eat Penguins, othe
External Genetalia is bad (may get bitten off or bad for
swimming, make draft)
- have internal genetalia or genetalia that tucks in
DELAYED IMPLANTATION: Fertilied egg remains dormant in the
uterus, ensuring the birth of young when t
Prduction of food is critical
MUST HAVE: producer (of energy; at bottom; ex/
plants), primary consumer (feed directly on plants,
ex/ zooplankton, krill), secondary consumers (eat the
primary consumers, ex/
Time and Space
Western Australian Dolphins tool use. Pick up Sponge and
put at end of nose, put nose in mud/rock at bottom, scare
the fish up and eat the fishdont use echo location
because the fish in W. Australia are mostly water inside
(without swim bla
Odontocetes (toothed whales) killer whales, dolphins,
Mysticetes (filterfeeders) humpback whales and blue whales
Convergent Evolution: Ichthyosaurs (Jurassic Reptiles) had
similar body plan compared to that of present day marine