ENVS 1200 Lecture Notes - Lecture 7: Generation Time, Carrying Capacity, Logistic Function

• School: York University
• Department: Environmental Studies
• Course: ENVS 1200
• Professor: Anders Sandberg

Document Summary

Demography: study of factors that affect the growth + decline of populations. Log: scale of measurement using the log of a physical quantity instead of the quantity itself (y-axis should say log) In a logarithimic scale, a constant rate of mortality is seen as straight line. In a arithmetic scale, a constant rate of mortality is seen as a curved line. Population growth: patterns of survival: 3 ways biologist do it. Follow a cohort (table) a user defined group. Record age of death for large # of individuals (if u can estimate the age of death, u can determine patterns of survival. Use the age distribution to calculate survival (not easy to get age off organisms) Life tables: are age-specific tables showing the expected mortality rates: age structure. A measure of the relative ages within a population. Birth rates, deaths sex ratio, generation time, age structure and dispersal (emigration and immigration)