Chemoreception: Migration Flashcards
1
Q
What can decrease olfactory sensitivity?
A
- pollutants (pesticides)
2
Q
Give an example of a pesticide and its effects
A
- IPBC
- potential failure to detect natal stream for spawning = no reproduction
3
Q
What are the 6 reasons fish migrate?
A
- separation of life stages
- increased larval survival + finding proper habitat
- maximization of feeding/growth
- reduced intraspecific competition for resources
- better feeding grounds
4
Q
Why do fish migrate for separation of life stages?
A
- avoid cannibalism
5
Q
What are the 3 ways fish migrate?
A
- gradient cues
- celestial clues
- orientation to geomagnetic/geoelectric fields
6
Q
What are gradient cues?
A
- temp, salinity and chemicals
7
Q
What are celestial clues?
A
- orientation by position of sun
8
Q
What is important for geomagnetic and geoelectric fields?
A
- oceanic currents
