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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
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