Larval Behaviour Flashcards
What are 2 important considerations for larval locomotion
Density
Shape
Why is density important
Most larvae heavier than water
Lecitotrophic larvae have positive buoyancy with shells with neutral buoyancy
Why is shape important
Sinking rate affected by spines or setae
Is movement by cilia significant for lateral tranport
It is not significant for lateral transport
Is movement by appendages significant for lateral transport
There is some limited significance
What% of temperatures effect on swimming does viscosity explain
Water viscosity explains 40% of temperatures effect on swimming performance
What is the main role of larval locomotion
To maintain position in the water column and move vertically through it
What is depth regulation
The major function of locomotion in marine larvae
What is the predator avoidance hypothesis
Compromise between feeding and escape from visual predators
What is depth regulation based on
Based on alternating passive seimmimt and upward swimming in response to signals
How do tactic responses change
Ontogenetically
How do geo and phototaxis work
They may work as reinforcing or opposing forces
What does a sudden decrease in light levels indicate
Indication of a predator (shadow response)
What does a slow decrease in light levels indicate
Sunrise or sunset
What is taxis reinforced by
Predator kairomones
