Costs of locomotion Flashcards
Define metabolic cost of locomotion
- amount of energy required (beyond basal needs at rest) to move animal a unit of distance
What is metabolic cost expressed as (units)
Kcalkg-1km-1
OR
litres of O2kg-1km-1
How is metabolic cost measured
- using swim tunnels (respirometers)
What is a respirometer
- treadmill for fish
- water velocity (m/s)
- distance
What does respirometer do?
- measures O2 in water in a CLOSED SYSTEM
How is the slope of a respirometer measured?
- O2 conc * rate
What does the slope of a respirometer mean?
- oxygen consumption and performance indicator
O2 consumption ____ with swimming speed
- increases
What is SMR?
standard metabolic rate
How do you calculate SMR
resting MR / basal MR
What is ucrit?
- performance indicator
- critical swimming speed
What is critical swimming speed?
- max sustainable swimming speed before fatigue
MR ___ with swimming speed
- Increases
What does restless behaviour relate to?
- spontaneous movement
How do you estimate SMR?
- extrapolate graphs to 0 (resting)
What is cost of transport?
- O2 consumed when moving 1kg of mass over 1km distance
What does mass specific metabolic rate mean?
- costs per unit weight decrease with larger body sizes
How do you calculate volume of oxygen consumption rate?
.
V(ml(o2) * kg-1 * h-1/km-1)
What does “.” mean over a sign
- rate
How do you calculate the mass of oxygen consumption rate?
.
m(o2) (MG(o2) * kg-1 * h-1 / km-1)
What is the difference in calculating oxygen consumption volume vs mass?
- ml vs mg
What does kg-1 mean?
- mass
What does h-1 mean?
- time
What does km-1 mean?
- distance
cost of swimming in larger massed SALMON is ____
less expensive
