10-5: POPULATION GROWTHCHAPTER 19

1. MODELS OF GROWTHExponential

a) birth and death rates are constant

(b > d)

1. MODELS OF GROWTHExponential

a) birth and death rates are constant

(b > d)

b) the rate increases as the population gets larger

c) 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 GROWTHLimiting 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 = 37-20 = .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 = 1000 -100 = .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= 25-75 = -.25 per week 200

CLASS WORK

Oceanic Bacteria Lab

14.4 Power Notes