L8 - Marine Mammals 3

Question 1

What 4 types of sound do Mysticetes produce?

Answer 1

1) Low frequency
- pure tones or cycles
- fin whales

Question 2

What are the 4 main categories of echolocation?

Answer 2

1) low frequency - narrow band (common porpoise)
2) low frequency - broad band - orca
3) high frequency - broad band - bottlenose dolphin
4) Ultrasonic - broad band - Indus river dolphins

Question 3

Instead of echolocation what do seals use when they forage in areas with no light>

Answer 3

Mechanolocation

• their whiskers (vibrissae) are rigid and mobile and can sense very minute movements in water
• hydrodynamic sense - they can sense/track fish through water via the trail the fish has left

Question 4

As a maternal strategy, how long do each fast for?

a) Phocid
b) Otariid
c) Walrus

Answer 4

a) Phocid - all of lactation
b) Otariid - 5-11days
c) Walrus - a few days

Question 5

As a maternal strategy, how long is the duration of lactation?

a) Phocid
b) Otariid
c) Walrus

Answer 5

a) Phocid - short (1-8weeks)
b) Otariid - long (4m-3y)
c) Walrus - very long (2-3y)

Question 6

As a maternal strategy, how high is the milk fat content?

a) Phocid
b) Otariid
c) Walrus

Answer 6

a) Phocid - very high (50-60%)
b) Otariid - high (24-44%)
c) Walrus - low (14-32%)

Question 7

As a maternal strategy, do the offspring forage wit the parents during lactation?

a) Phocid
b) Otariid
c) Walrus

Answer 7

a) Phocid - no
b) Otariid - no
c) Walrus - yes