Chemoreception

Question 1

What is the importance of chemoreception? (4)

Answer 1

• food detection
• predator avoidance
• parental care
• location of spawning streams

Question 2

How do nurse sharks detect food?

Answer 2

• klinotaxis - concentration gradient searching behaviour

Question 3

How do teleosts and elasmobranchs detect food?

Answer 3

• amines and amino acids as triggers

Question 4

Salmon migrate to ___ stream for spawning. how does this happen?

Answer 4

• natal (origin)
• imprinted cues during migrations (premolts and smolts)

Question 5

What are possible triggers/cues during salmon migrations?

Answer 5

• Ca? Skin mucus?

Question 6

How do sea lamprey migrate?

Answer 6

• choose streams based on conspecific cues

Question 7

How do male lamprey choose spawning streams?

Answer 7

• larval bile acids in stream (indicates stream safe for spawning)

Question 8

How do female lamprey choose spawning streams?

Answer 8

• male pheromones

Question 9

What do paired nostrils help with?

Answer 9

• spacial info

Question 10

What is the effect of blocking a single nare?

Answer 10

• impairs direction finding

Question 11

What sense helps with migration?

Answer 11

• olfactory bulb electrical response