8 The amount of food for the mouse Disease among the wolf population Isle RoyaleIn addition to the predator/prey relationship, the moose and wolf population were affected by:The amount of food for the mouseDisease among the wolf population
20 If natality is 10, mortality is 6, immigration is 3, and emigration is 2…… What is the net effect on the population size?If the original population consisted of 10 individuals, what is the new population size?
21 Population Growth Rate If birth rate > death rateThe population will…..If birth rate < death rateThe population will….
22 Exponential Growth (J–shaped curve) If ideal conditions (have everything!) continue, the population will continue to grow rapidlyDoubling and re-doubling1, 2, 3, 8, 16, 32, 64, 128……..Does NOT last long in nature – WHY?
23 Exponential Growth (J–shaped curve) d) This is current human population growth worldwideHow long can it last?Discusse) Draw graph*Industrial revolution
24 Boom and BustAs ideal conditions continue, population grows exponentially until it reaches a “peak” size (boom) and then crashes (bust)Ex: Rabbit populationDraw graphs
27 Logistic Growth (S-shaped curve) a) Exponential growth at first, eventually the population size levels off as the growth rate slows down b) Carrying capacity: Largest number of individuals that the environment can support
28 Logistic Growth (S-shaped curve) Draw graphThings that prevent the population from getting too big:Lack of food or waterHome/shelter availability
29 Reproductive Patterns r-strategy: rate strategyGenerally are smallShort life spansProduce many offspringrat, fruit fly, locusts (Fig. 4.9)
30 Reproductive Patterns k-strategy: carrying capacity strategyLarger organisms, long life spanProduces few offspring –better chance of survivalTake care of the offspring, usually for a long timeKangaroo, elephant
31 DemographyThe study of human population size, density, distribution, movement, and birth and death rates
32 Demographic Transition A change in a population from high birth and death rates to low birth and death rates(Read pg 102)