Vision/Photoreception and behaviour Flashcards
1
Q
What are the 4 main behaviours related to vision?
A
- communication
- predator avoidance
- feeding behaviour
- schooling/shoaling
2
Q
How do fish communicate visual?ly
A
- visual cues via pigmentation
3
Q
What causes pigmentation?
A
- chromatophores in dermis of skin
4
Q
What colour do carotenoids show?
A
- bright red/yellow
5
Q
What colour do melanins show?
A
- dark, red, brown, black
6
Q
What colour do purines show?
A
- colourless crystalline substances (reflect)
7
Q
What does colour pattern play a role in? (3)
A
- intraspecific communication
- predator avoidance (camouflage)
- thermoregulation
8
Q
What does melanin protect from?
A
- UV light
9
Q
White = ____, black = _____
A
- reflection
- absorption
10
Q
What does a change in chromatophore size do?
A
- changes colouration
11
Q
How does colouration pattern play a role in intraspecific communication? (3)
A
- reproductive success
- feeding success for foragers
- lateral stripes for schooling
12
Q
How does colouration increase reproductive success?
A
- signal to potential mate
13
Q
What is monochromatism?
A
- single colour
14
Q
What is polychromatism?
A
- many colours
15
Q
How does colouration increase feeding success?
A
- change colour when find food = signals food available
16
Q
How do lateral stripes help schooling?
A
- orientation in synchronized swimming
17
Q
How does colouration play a role in predator avoidance?
A
- camouflage
- countershading
- eye spots focus attack on tail
18
Q
How does countershading help the fish? (2)
A
- disrupts attacks from above (dark looking down)
- bottom silver to avoid silhouette
19
Q
How do eyespots help the fish?
A
- focus attack on tail to escape
