Open Populations * Influenced by the all factors — natality, immigration, mortality and emigration. * Most wild populations. Closed Populations * No immigration and emigration * Only natality and mortality determine population growth. * Rare — Onisolated islands, petri dish Practice Questions: 1. a) Atown had 1346 people in 1986 and 1455 people in 1996. What is this population’s rate of change? AN = INSS =134, 3“2 l___O‘] .‘:f/b‘7 /'?(a,\ — lbq b) If the town was 19 ha in 1986, what was the population density? Dp = I134L _ c) If the town increased in size to 23 ha in 1996, what was the rate of population density change? Dp: ,L.[S‘S"' - C?,?P{—OPQ/L\“—' 23 31 Taylor Version