Sources of Energy
•Mammals: liver stores exhausted in 48 hours
•Breeding: 10-15 days on glycogen stores
•Relying on epiphytes high in glycogen?
•Brain cells need glucose
–Use ketones in emergency
•Shifted fuel needs from glucose to ketones?
•Source of ketones:
–liver fatty acids mobilised from adipose tissue
Wood Frog (Rana sylvatica)