Social Behaviour- Aggression 9 Flashcards Preview

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Flashcards in Social Behaviour- Aggression 9 Deck (9)
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1

When is there a peak in gonadal testosterone in red deer stags?

Just before the 2 week mating period which coincides with the highest incidence of aggression

2

What were the effects of castration on red deer stags (Lincoln et al.)?

Antlers were less developed, lost social status and there was no rutting behaviour

3

What happened when the castrated red deer stags were given testosterone?

Restored rutting behaviour and increased social rank

Antlers still did not fully develop

4

What hormone is important for non breeding aggression?

Oestrogens

5

What happens in mice if they are castrated before day 6 and then given testosterone later in life?

Showed male type aggression

Aggression is determined early in life in males

6

What was found in Syrian hamsters that suggests there is a second round of organisation around puberty?

Males castrated before puberty showed little aggression even when given testosterone

7

What happened when high anxiety rats were given a brain injection of oxytocin and AVP antagonists?

The high aggression was reduced

8

What is the challenge hypothesis?

Androgens are increased and associated with aggression only when intermale competition is high

9

If testosterone is advantageous why is it not produced all the time?

Foraging and survivorship reduced

Energy expenditure increased