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EMT > Humpback > Flashcards

Humpback Flashcards

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1
Q

Humpback length

A

40-50ft, females longer, reverse sexual dimorphism

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2
Q

Weight

A

60,000-90,000lb or 30-45 tons

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3
Q

Tail width

A

13-18ft

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4
Q

Pectoral flipper length

A

13-16ft

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5
Q

Length at birth

A

12-15ft

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6
Q

Weight at birth

A

1,500-2,000lb

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7
Q

Lifespan

A

70-100years

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8
Q

Sexual maturity

A

6-8years

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9
Q

Diet

A

Krill small fish herring

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10
Q

Number population segments

A

14

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11
Q

How many whales in 1966

A

1,500-2,000 in central n pacific

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12
Q

How many whales now

A

20,000+ in central n pacific

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13
Q

How long is total yearly migration

A

6,000

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14
Q

Why cold water in summer

A

Warm waters do not hold onto dissolved oxygen as well so are not as productive / there isn’t as much food there

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15
Q

How much body weight can humpbacks lose in summer

A

Up to 1/3

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16
Q

Why do they leave Ak for winter

A

Avoiding predator species of transient orcas

17
Q

What is the survival rate for 1st year of humpback life

A

70%

18
Q

What is baleen made of

A

Keratin

19
Q

How many baleen plates

A

400

20
Q

How big is humpback throat

A

15in - about the size of grapefruit

21
Q

What is a temporary whale gathering called

A

Gam

22
Q

How long is a typical dive

A

5-7mins

23
Q

How long can humpbacks hold breath

A

Almost an hour

24
Q

Record humpback depth dive

A

2,021 ft

25
Q

Avg humpback dive depth

A

700ft

26
Q

How is humpback skeletal structure adapted to diving

A

Tiny and irrelevant sternum gives ribs extra flexibility along w angle and flexible jointer –> lets them collapse lungs on a deep dive

27
Q

Explain whale sleeping

A

Whales are conscious breathers –> voluntary breath at surface, hemispheric resting lets them stay partly conscious and have 1/2 of brain asleep at time for periods of 15-40 mins and 2-5hrs per day –> behavior called logging

28
Q

How long is gestation period

A

11-12months fitting w migration timeline

29
Q

How often do they reproduce

A

2-4yrs

30
Q

What percent milk fat is mothers milk

A

50% (human is 3-4%)

31
Q

How much milk consumed per day

A

Over 100 gallons gaining 80-100lb per day

32
Q

Primary threats

A

Ship strikes and entanglement in fishing gear, also acoustic disturbance, climate change, stress from rec vessels and ocean debris

EMT (2 decks)

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