LIFESCI 1 Lecture Notes - Lecture 14: California Tiger Salamander, Homeostasis, Ground Squirrel

• School: UCLA
• Department: Life Sciences
• Course: LIFESCI 1
• Professor: Alfaro, Yeh, Lloyd- Smith

Document Summary

Examples: severely endangered species; populations with finite/bounded ranges, like an island. An ecological model for population growth: change in population size depends on the number of births and deaths over a given time, bd model ( birth-death ) of population change. N(t) = population size of this year. B = # births in a population. B = bn: per capita death rate (d): chance of dying for an average individual. Cohort: all individuals (finches) born in a particular year (1978) in that location (isla daphne) Follows this cohort of birds and saw how they did over the course of their life span: survivorship is cumulative shows the proportion of birds born in 1978 that are still alive. Start at 1 (100%) drops down to 0. 05 (5%: fecundity is not cumulative shows per year. Common mistake: dividing by the wrong population size.