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Mammalian Diversity > Rodentia > Flashcards

Flashcards in Rodentia Deck (18)
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1

What are the 3 sub orders of this group ?

Squirrel-like
Mouse-like
Cavy-like

2

Give examples of species within the squirrel like rodent sub order ?

Beavers, squirrels, spring hare

3

Describe the teeth of organisms within the squirrel like rodent sub order.

Simple teeth
Lack large cusps or sharp enamel of other rodents

4

Describe the reproduction methods of the Squirrel like rodents

Multi paternal litters
Males have large scrotums to outcompete other sperm through sheer numbers.

5

How is a large scrotum an example of directional selection?

Males with largest scrotum produce large amounts of sperm
Increased differential reproductive success
Offspring will inherit beneficial gene.

6

Give the species found within the sub order, mouse-like rodents

Rats and mice
Voles and lemmings
Hamsters, gerbils, dormice, jumping mice, birchmice
Pocket mice, kangaroo rats.

7

Describe the diet of mouse like rodents

Mainly seedeaters but exploit many other food niches

8

Give the reproductive strategy of the mouse like rodents

R-strategists
Early and prolific reproduction

9

List the species found in the sub order 'Cavy like rodents'

Cavies, capybara, agoutis, chinchillas, porcupines, guinea pigs, African mole rat.

10

Give the habitat of naked role mats.

Subterranean, underground dwellers.

11

What organisms social structure is a naked mole rat colony similar to ?

Insect social structure

12

How many mating pairs exist within a naked mole rat colony ?

1 pair, one male and female

13

What are castes (naked mole rats) ?

Groups, which naked mole rats are split into depending on size.

14

What is the function of naked mole rats in the working caste ?

Mole rats carry food and nest material to the communal nest

15

What happens to naked mole rats which grow to become larger than their counterparts ?

Will move from the working caste to become non workers
Associate with breeding female and are involved in colony defence.

16

How are the naked mole rats young cared for ?

Cared for by all females but only suckled by the breeding female

17

Naked mole rats are not sterile, how is breeding among other individuals prevented ?

By aggression ?
Pheremones (like insects)

18

What is the benefit to the naked mole rat colony of looking after their offspring ?

Whilst they forfeit reproduction and passing on genes
They are helping propagate genes of close relatives (kin selection)