BISC 309 Lecture Notes - Lecture 6: Master Sergeant

• School: Simon Fraser University
• Department: Biological Sciences
• Course: BISC 309
• Professor: Nicole Tunbridge

Document Summary

Stochastity: random variation that can occur due to environmental effects or demographic effects. Habitat loss due to pollution, over exploitation, etc. All these factors can contribute to make populations small. When populations get small we have increase in inbreeding and decrease in genetic variation. reduces fitness and further reduces population size and feeds back in to the system. Demographic stochasticity: affects small populations specifically. have effects of random variation and the number of babies they have. Demography: study of change of population abundance or population abundance over time. need to think about how population increases in size. what factors are causing gains? (births/natality, immigration) and loss (death/mortality, emigration). these are the. 4 major factors that will affect population dynamics. Subtract nt from both sides and you get simplified version. N= b-d. this is because we assume a closed population with no immigration or emigration.