BI111 Lecture Notes - Lecture 31: Skink, Semelparity And Iteroparity, Senescence
Document Summary
Type i: high survivorship until late in life, e. g. Type ii: constant rate of mortality in all age classes, e. g. Type iii: high juvenile mortality, followed by low mortality after critical age and size, e. g. Influenced by organism"s physical and ecological environment: development rate, age of sexual maturity/first reproduction, number of offspring/frequency of breeding, level of parental investment, senescence and death. Fixed energy budget may result in trade-offs between fecundity and parental care: passive parental care before offspring born: 10 eggs at 100 units energy each. 1,000 eggs at 1 unit energy each = 1,000 total: active parental care after offspring born: Whales produce 1 giant baby whale which will most likely survive. Rats produce a large litter, but not all of the babies survive. Semelparity: one reproductive episode, devotes all stored energy, maximum fecundity, death after reproduction. Iteroparity: multiple reproductive episodes, only some energy devoted in each event.
