# BIOB50H3 Lecture Notes - Lecture 6: Competitive Exclusion Principle, Inbreeding Depression, Genetic Load

## Document Summary

Graph of lx data, often set to 1000 individuals (log-scaled) or 100% of population. Type ii survivorship curve: survival declines steadily (negative linear correlation with age, risk of morality constant over time, seen in many birds, small mammals, some reptiles and amphibians, many plants (seed bank survival), including many annuals. Common in natural populations: periods of growth (breeding seasons) and decline (non-breeding seasons, e. g. songbirds, bears, anything with a breeding season. Periods of growth (breeding seasons) and decline (periods between breeding seasons) Populations grow geometrically when reproduction occurs at regular time intervals, which are called discrete time periods. Species population changes in size by a constant proportion from one discrete time period to the next this way, the number of individuals added during each time period gets bigger and bigger. Substitute (b-d)=r; r is the geometric rate of increase (similar to r for exponential growth)