Biology 1001A Lecture Notes - Intraspecific Competition, Niche Differentiation, Interspecific Competition

• School: Western University
• Department: Biology
• Course: Biology 1001A
• Professor: Tom Haffie

Document Summary

Over time we tend to transition from the pre industrial societies, in which birth and death rates are high, which mean that population size and r is low. Over time populations move into the transitional stage (people are moving into the city, increase in economic development). When this occurs, we see a decrease in death rates, but the birth rates are still high. Therefore capita birth rates continue to increase through the transitional stage. This is where values of r are at their maximum. When individuals start to move more and more into the cities, death rates decrease and birth rates start to decrease, which is known as the industrial stage. As a result little r starts to decrease. The post industrial stage is defined as reaching zero population growth: these models were designed to explain what was occurring in europe and north.