Migration Flashcards
1
Q
What is migration?
A
Season mass movement that typically involves a switch from one habitat to another
2
Q
Why do organisms migrate?
A
- Seasonal changes in the local environment
- Changing needs at different life stages
- Move to a suitable habitat for reproduction
3
Q
Hyperphagia
A
Intense period of feeding prior to migration
4
Q
Advantages of breeding in the Arctic
A
- Long daylight hours and very productive ecosystem
- Ample resources
- Space (reduces competition)
- Relatively few predators
5
Q
How do birds navigate
A
- Chiefly by sight (topographical landmarks)
- Earth’s magnetic field
- Sun and stars
6
Q
Migration in amphibians and reptiles
A
Migrate to aquatic breeding ground or egg-laying site
7
Q
Migration in fish: Catadromous
A
Migrate downstream to spawn (from freshwater to ocean)
8
Q
Migration in fish: Anadromous
A
Migrate upstream to spawn (from ocean to freshwater)
9
Q
Migration in fish: Freshwater eel
A
- Catadromous (Live in freshwater & migrate to ocean to spawn)
- Spawn at a depth of 300 m
10
Q
Migration in fish: Salmon
A
- Anadromous (spend adult lives at sea and return to freshwater to spawn)
- Guided by olfactory senses
11
Q
Migration in mammals
A
Few terrestrial mammals migrate
* Terrestrial locomotion is more energetically costly than swimming or flying
