10-5: POPULATION GROWTH CHAPTER 19

1. MODELS OF GROWTH Exponential a)birth and death rates are constant (b > d)

1. MODELS OF GROWTH Exponential a)birth and death rates are constant (b > d) a)the rate increases as the population gets larger b)limited by density-independent factors

DRAW THIS GRAPH AND A LINE SHOWING WHAT EXPONENTIAL GROWTH WOULD LOOK LIKE

works well for bacteria growth but not for most organisms

1. MODELS OF GROWTH Logistic a)starts off as b> d b)levels off as it reaches carrying capacity (K)

1. MODELS OF GROWTH Logistic a)starts off as b> d b)levels off as it reaches carrying capacity (K)  (K): the number of individuals the environment can support over time.

1. MODELS OF GROWTH Logistic a)starts off as b> d b)levels off as it reaches carrying capacity (K)  (K): the number of individuals the environment can support over time. c)This is when b rates = d rates (zero population growth) d)limited by density-dependent factors

DRAW THIS GRAPH AND A LINE SHOWING WHAT A LOGISTIC GROWTH WOULD LOOK LIKE Label carrying capacity with a K

Most organisms such as seals, and whales follow this model

2. REGULATING POPULATION GROWTH Limiting factors: restrains population growth

2. REGULATING POPULATION GROWTH Density-independent factors: no regard for population density limits exponential growth EX. Weather, seasons, natural disasters

2. REGULATING POPULATION GROWTH Density-dependent factors: increase or become more prominent when the population density increases Limits logistic growth EX. predation, pollution, food shortage

3. GROWTH RATE Growth rate= births – deaths total population

GROWTH RATE PRACTICE There were 37 deaths and 20 births in a seal population of 300.

GROWTH RATE PRACTICE There were 37 deaths and 20 births in a seal population of 300. Growth rate = =.057 per month 300

GROWTH RATE PRACTICE 100 deaths and 1000 births in a garibaldi population of 2,000 in 6 months.

GROWTH RATE PRACTICE 100 deaths and 1000 births in a garibaldi population of 2,000 in 6 months. Growth rate = =.45 every six months 2000

GROWTH RATE PRACTICE 25 births/200 sea otters in one week; 75 deaths/ 200 sea otters per week.

GROWTH RATE PRACTICE 25 births/200 sea otters in one week; 75 deaths/ 200 sea otters per week. Growth Rate= = -.25 per week 200

CLASS WORK Oceanic Bacteria Lab 14.4 Power Notes