BIO120H1 Lecture Notes - Lecture 19: Fecundity, Semelparity And Iteroparity, Seed Predation
36
BIO120H1 Full Course Notes
Verified Note
36 documents
Document Summary
Typical life history for higher plants+ animals: start at small size, grow for a period before reproducing, with enough resources, become mature- spend them on reproduction (different lifestyles after sexual maturity) Age-structure population growth: considered single population, fecundity and survivorship change with age, summarized by life tables (age-sex pyramids) Age- class intervals: arbitrary units of time, for humans, typical 5 years, life tables, data that summarizes life events that are statistically expected for the average individual of a specifiic age, consider females only (limiting) Type 1: survivorship is high at younger years, drops quickly at later ages. Type 2: mortality constant with age, exponentially declines (half-life) Type 3: early mortality (lots of eggs, frail offspring- die off) Population growth rates: average expected number of daughters a female will have in her lifetime. Generation time t(average age at which a female gives birth)
