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Flashcards in Pinnipedes Deck (25)
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1

Give the phylogenetic position of the pinnipeds.

In the order Carnivora
Closely related to Mustelids and Ursidae

2

Give the 3 families contained within the pinnipedes

Odobenidae- Walrus
Otariidae- Eared seals
Phocidae- True seals

3

Give the use of a walruses tusks and on which sex they are found

Both sexes
Used to battle between males
Protection from predation
Haul themselves onto ice

4

How is the Odobenidae adapted for feeding ?

Walrus skull is specialised fro feeding on clams and other benthic invertebrates

5

Give the 2 main groups of eared seal.

Fur seals and Sea lions

6

Which flippers of the eared seals have a key role in propulsion in water ?

Large fore flippers
(hind only for steering

7

Why are eared seals more agile than True seals on land ?

Can support weight on foreflippers
Hind flippers turn inwards to enable walking

8

Which flippers of the eared seals have a key role in terrestrial locomotion ?

Both fore and hind flippers

9

On which family is a pinna found ?

The Otariidae, Eared seals

10

Where is the muscle mass found in the family Otariidae ?

Eared seals, At the front of the body

11

Which flippers do true seals use for swimming ?

Hind flippers

12

Where is the muscle mass found in the family Phocidae

True seals, the rear of the body

13

Give the distinguishing deatures of the Grey seal.

Roman nose
Parrallel shaped nostrils

14

Give the defining features of the Common Seal

Flat faced
V shaped nostrils

15

Give some sensory adaptions of seals

Good vision on land and sea
Higher vocal repertoire
Can hear higher frequencies
Click vocalisations- Echolocation ?

16

What is delayed implantation ?

A fertilised egg will remain as a blastocyst till its ready to attach to the uterine wall.

17

Give a collective group within the pinnipeds that exhibit delayed implantation.

Seals

18

What is the advantage to a seal of delayed implantation ?

Condenses breeding season on land (most vulnerable)
Enables birth of pup when environmental conditions ideal

19

Elephant seals defend matin beaches, what does this enable ?

Alpha male can exhibit Polygyny
up to 100 females a season

20

Describe the morphology of elephant seals.

Huge proboscis
3 times the mass of the female

21

How do male elephant seals establish territory ?

Participating in Bloody fights for dominant position on

22

How many pups will elephant seal females produce in a 12y lifetime

14 pups

23

What happens to subdominant male elephant seals ?

Hang around the edges of the mating beaches and intercept females as they return to the sea.

24

Male elephant seals (bulls) are very aggressive, give examples of this ?

Will attempt to mate with pregnant females
Trample pups

25

Describe a key difference in male and female elephant seal pups

Will steal milk from females to grow bigger