Reptile behaviour (lecture 8) Flashcards Preview

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Flashcards in Reptile behaviour (lecture 8) Deck (18):
1

reptiles use many kinds of signaling

visual
auditory
olfactory

2

visual

-medium range
-fast transmission rate
-does not travel around objects
-little night use
-fast fade out time
-easy locate sender
-varies from costly to manufacture and maintain signals(risk or predators)

ex. jacky dragons attract attention with tail flick; must be conspicuous against moving vegetation

dragons have UV vision
and change color

3

auditory

-long range
-fast transmission rate
-travels around objects
-night use
-fast fade out time
-locate sender varies
-high cost to manufacture

ex. geckos vocalize

4

olfactory

-short range
-slow transmission rate
-travels around objects
-night use
-slow fade out time
-locate sender is difficult
-low cost to manufacture

5

most reptiles

solitary
have polygamous mating system
no parental care

6

skinks, geckos, and snakes

have evolved some form of grouping and social behavior has evolved
-aggregation
-rudimentary parental care
-stable social groups

7

Egernia

-genus of Australian skink
-shows the most complex forms of social behaviour
- a model system for understanding the evolution of social behavior
-stable pair bonds within and between seasons (social and genetic monogamy)
-groups consist of an adult pair and offspring

8

social behavior and group structure

-facilitated by recognition of familiar and unfamiliar individuals and/or related and unrelated individuals

ex. tree skinks appear to recognise related individuals

gidgee skinks and block role skinks are mainly able to distinguish familiar/unfamiliar individuals irrespective of relatedness

9

sociality

expected to evolve when the benefits outweigh the costs

10

cost

-increased visibility of predators
-increased competition for resources and increased disease and parasite transfer

11

benefits

-increased protection from predators
-physiological benefits(reduced heat or water loss)
-parental care/protection

ex. Egernia
-increased vigilance in gidgee skinks and parental care in black rock skinks

12

factors thought to promote sociality

ecological factors
life-history traits

13

ecological factors promoting sociality

aggregation
limited resources

14

aggregation

occurs when access to key resources (like shelter, food, and mate) is limited because they are clumped in space or time

15

limited resources

can favor the evolution of territoriality and social groups

16

life-history traits promoting sociality

long life span and long period until reproductive maturity may favor delayed offspring dispersal

17

comparing social behavior within and between species

tree skinks differ in their social behavior depending on the habitat
-suggesting that habitat influence behavior
-almost all Egernia with stable social groups are rock dwelling, except for E. frerei(challenging habitat hypothesis)

18

life history difficult to assess

-all examined species so far are long lived and have delayed juvenile dispersal