Migration

Question 1

Define epitoky.

Answer 1

Behavioural, morphological and physiological changes during it’s sexual maturation.

Question 2

Give an example of migratory adaptions.

Answer 2

• Ragworm
• Only males swarm
• Spawning induced by temperature rise, light intensity, lunar and tidal cycle
• Surface waters to release sperm.

Question 3

What causes zooplankton vertical Migration?

Answer 3

• Light intensity

- Temperture.

Question 4

Why do zooplankton vertically migrate?

Answer 4

• Predator avoidance
• Avoiding UV damage
• Metabolic advantage: saves energy.

Question 5

Define amphidromous.

Answer 5

Fish who migrate from freshwater to Sea, but not to breed.

Question 6

Define potamodromous.

Answer 6

Migrations wholly occur in freshwater.

Question 7

Define oceanodromous.

Answer 7

Migration wholly occurs in sea.

Question 8

How do turtles navigate during migration?

Answer 8

• Ability to detect magnetic fields
• Chemical cues
• smell?