click on a lesson name to select. chapter 4 population ecology section 1: population dynamics...
TRANSCRIPT
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Click on a lesson name to select.
Chapter 4 Population Ecology
Section 1: Population Dynamics
Section 2: Human Population
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Population Density
The number of organisms per unit area or volume
4.1 Population Dynamics
Spatial Distribution
Chapter 4 Population Ecology
Dispersion is the pattern of spacing of a population.
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Chapter 4 Population Ecology
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Patterns of distribution
Uniform Random Clumped
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Clumped distribution• Clumped distribution is the most common in nature• found in environments that are characterized by patchy resources• Animals need certain resources to survive, and when these
resources become rare during certain parts of the year animals tend to “clump” together around these crucial resources.
• Organisms that usually serve as prey form clumped distributions in areas where they can hide and detect predators easily.– schools of fish aggregate to minimize the chance that any one fish will be
eaten.
• Hunting-- Hyenas, lions, and cheetahs hunt in packs• Humans exhibit a clumped distribution
– Cities, towns, neighborhoods, households
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Uniform Distribution
• Also known as even distribution• Characterized by the maximization of distance between any
two individuals. • Typically found in plants; they compete for a resource such as
soil nutrients or moisture– Space themselves far apart in order to maximize the amount of resource
consumption. I
• Can also be a result of territorial behavior as in penguin colonies.
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Random Distribution
• Also known as unpredictable spacing• Least common form of distribution in nature• Occurs when the members of a given species are found in
homogeneous environments in which the position of each individual is independent of the other individuals
• Neither attract nor repel one another• Dandelion seeds are dispersed by wind, random distribution
will often occur as the seedlings land in random places determined by uncontrollable factors.
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Population Ecology
4.1 Population Dynamics
Common dolphin
Pupfish
A species might not be able to expand its population range because it cannot survive the abiotic conditions found in the expanded region.
Population Ranges
Chapter 4
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Population Ecology
Population-Limiting Factors
4.1 Population Dynamics
There are two categories of limiting factors
density-independent factors
density-dependent factors.
Chapter 4
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Density-Independent Factors Any factor in the environment that does not
depend on the number of members in a population per unit area is a density-independent factor.
Population Ecology
Weather events Fire Human alterations of the landscape Air, land, and water pollution
4.1 Population Dynamics
Chapter 4
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Density-Dependent Factors
Any factor in the environment that depends on the number of members in a population per unit area is a density-dependent factor.
Population Ecology
Biotic factors Disease Competition Parasites
4.1 Population Dynamics
Chapter 4
Population Biology
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Population Ecology
Population Growth Rate
The population growth rate (PGR) explains how fast a given population grows.
The natality of a population is the birthrate in a given time period.
4.1 Population Dynamics
Chapter 4
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Population Ecology
Exponential Growth Model
Exponential growth occurs when the growth rate is proportional to the size of the population.
All populations grow exponentially untilsome limiting factor slows the population’s growth.
4.1 Population Dynamics
Chapter 4
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Exponential Growth Model Equation
• dN = Change in population• dt = Change in time• r = rate of increase• N = # of individuals
• r = b-d• b = birth rate (b = B/N)• d = death rate (d = D/N)• B= # of births• D = # of deaths
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Population Ecology
Logistic Growth Model
The population’s growth slows or stops following exponential growth, at the population’s carrying capacity.
4.1 Population Dynamics
Chapter 4
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Logistic Growth Model Equation• dN = Change in population• dt = Change in time• r = rate of increase• N = # of individuals• K = Carrying Capacity
• r = b-d• b = birth rate (b = B/N)• d = death rate (d = D/N)• B= # of births• D = # of deaths
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Population Ecology
4.1 Population Dynamics
Chapter 4
A population stops increasing when the number of births is less than the number of deaths or when emigration exceeds immigration.
Births < deaths
Emigration (exit) > immigration (into)
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Population EcologyChapter 4
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Population Ecology
Carrying Capacity
The maximum number of individuals in a species that an environment can support for the long term is the carrying capacity.
Carrying capacity is limited by the energy, water, oxygen, and nutrients available.
4.1 Population Dynamics
Chapter 4
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Population Ecology
Reproductive Patterns
Species of organisms vary in the number of births per reproduction cycle, in the age that reproduction begins, and in the life span of the organism.
4.1 Population Dynamics
Chapter 4
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Population Ecology
An r-strategist is generally a small organism.
Short life span
Produces many offspring Little parental care Example—spiders, flies, insects
4.1 Population Dynamics
The rate strategy, or r-strategy, is an adaptation for living in an environment where fluctuation in biotic or abiotic factors occur. Unstable environment
Chapter 4
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Population Ecology
A k-strategist is generally a larger organism.
Long life span
Produces few offspring Lots of parental care Examples: Elephants, humans, Artic turns
4.1 Population Dynamics
The carrying-capacity strategy, or k-strategy, is an adaptation for living in stable environments.
Chapter 4
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Human Population Growth
The study of human population size, density, distribution, movement, and birth and death rates is demography.
4.2 Human Population
Population EcologyChapter 4
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Technological Advances
For thousands of years, environmental conditions kept the size of the human population at a relatively constant number below the environment’s carrying capacity.
Population Ecology
Humans have learned to alter the environment in ways that appear to have changed its carrying capacity.
4.2 Human Population
Chapter 4
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Human Population Growth Rate
Although the human population is still growing, the rate of its growth has slowed.
Population Ecology
4.2 Human Population
Chapter 4
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Trends in Human Population Growth
Population trends can be altered by events such as disease and war.
Population Ecology
4.2 Human Population
Chapter 4
Human populationgrowth is not the same in all countries.
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Population EcologyChapter 4
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Zero population growth (ZPG) occurs when the birthrate equals the death rate.
Population Ecology
Zero Population Growth
The age structure eventually should be more balanced with numbers at pre-reproductive, reproductive, and post-reproductive ages being approximately equal.
4.2 Human Population
Chapter 4
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Age Structure
Population Ecology
A population’s age structure is the number of males and females in each of three age groups:pre-reproductive stage, reproductive stage, and post-reproductive stage.
4.2 Human Population
Chapter 4
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Human Carrying Capacity
Population Ecology
Scientists are concerned about the human population reaching or exceeding the carrying capacity.
An important factor is the amount of resources from the biosphere that are used by each person.
4.2 Human Population
Chapter 4
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Population Ecology
Chapter Resource Menu
Chapter Diagnostic Questions
Formative Test Questions
Chapter Assessment Questions
Standardized Test Practice
biologygmh.com
Glencoe Biology Transparencies
Image Bank
Vocabulary
AnimationClick on a hyperlink to view the corresponding feature.
Chapter 4
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1. A2. B3. C4. D
CDQ 1
0% 0%0%0%
A. emigration
B. imitation
C. immigration
D. migration
Population EcologyChapter 4
Chapter Diagnostic Questions
What term is used to describe the number ofindividuals moving into a population?
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1. A2. B3. C4. D
CDQ 2
0% 0%0%0%
Population EcologyChapter 4
Chapter Diagnostic Questions
B. number of organisms in an area
C. characteristics of a population
D. manner in which a population grows
A. pattern of spacing of a population in an area
What is population density?
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1. A2. B3. C4. D
CDQ 3
0% 0%0%0%
Population EcologyChapter 4
Chapter Diagnostic Questions
A. when birth rate equals death rate
B. when death rate exceeds birth rate
C. when birth rate exceeds death rate
D. when there are zero births
When does zero population growth occur?
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1. A2. B3. C4. D
FQ 1
0% 0%0%0%
Population EcologyChapter 4
A. disease
B. fire
C. flooding
D. weather
4.1 Formative Questions
Which is a density-dependent factor?
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1. A2. B3. C4. D
FQ 2
0% 0%0%0%
Population EcologyChapter 4
A. competition
B. extreme cold
C. parasites
D. predation
4.1 Formative Questions
Which is a density-independent factor?
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1. A2. B3. C4. D
FQ 3
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Population EcologyChapter 4
A. emigration
B. predation
C. available nutrients
D. extreme temperatures
4.1 Formative Questions
Which factor can limit the carrying capacity of a population?
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1. A2. B3. C4. D
FQ 4
0% 0%0%0%
Population EcologyChapter 4
4.2 Formative Questions
A. bioinformatics
B. demography
C. ecology
D. ethnography
The study of the size, density, distribution, and movement of the human population is _______.
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1. A2. B3. C4. D
FQ 5
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Population EcologyChapter 4
4.2 Formative Questions
A. decreased agriculture
B. famine and wars
C. setbacks in medicine
D. voluntary populationcontrol
Which is a primary reason for the decline in the percent growth of the human population after 1962?
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1. A2. B3. C4. D
FQ 6
0% 0%0%0%
Population EcologyChapter 4
4.2 Formative Questions
A. CDC
B. HPG
C. PGR
D. ZPG
What will happen to the human population when the birthrate equals the death rate?
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1. A2. B3. C4. D
CAQ 1
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Population EcologyChapter 4
A. exponential
B. spatial
C. genetic
D. logistic
Chapter Assessment Questions
Which type of population growth model does this graph represent?
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1. A2. B3. C4. D
CAQ 2
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Population EcologyChapter 4
A. India has very little land for farming.
B. Germany is smaller per acre than
the United States.
C. More land is used to support an
individual in the United States.
D. A person in Indonesia requires more
land than a person in Brazil.
Chapter Assessment Questions
Based on the information in the graph, infer which statement accurately represents the information provided.
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Use the graph to explain the growth of the mice population.
Population EcologyChapter 4
Chapter Assessment Questions
CAQ 3
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Answer: If two adult mice breed and produce a litterand their offspring survive to breed, then the population grows slowly at first. This slow growth is defined as the lag phase. The rate of population growth begins to increase rapidly because the total number of organisms that are able to reproduce has increased. Exponential growth occurs when the growth rate is proportional to the size of the population. All populations grow exponentially until some limiting factor slows the population’s growth.
Population EcologyChapter 4
Chapter Assessment Questions
CAQ 4
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1. A2. B3. C4. D
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Population EcologyChapter 4
A. 0.23
B. 23
C. 230
D. 2300
Standardized Test Practice
An ecologist estimates a population density of 2.3 lemmings per square meter of tundra. What would be the approximate number of lemmings over 1000 square meters of tundra?
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1. A2. B3. C4. D
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Population EcologyChapter 4
Standardized Test Practice
A. density
B. dispersion
C. logistic spacing
D. spatial distribution
The ecologist finds that over a 1000m2 plot of tundra, lemmings tend to concentrate in clumps in drier areas. What is the term for this pattern of spacing?
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1. A2. B3. C4. D
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Population EcologyChapter 4
Standardized Test Practice
A. It is density-dependent.B. It is limited by biotic factors.C. It has a limited spatial
distribution.D. It is randomly dispersed in
the environment.
Brine shrimp are able to survive only in certain lakes that have a very high salt concentration. Which is the correct population characteristic of brine shrimp?
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1. A2. B3. C4. D0% 0%0%0%
Population EcologyChapter 4
Standardized Test Practice
Why does the population growth level off at 10,000?
A. Biotic factors have made survival difficult.
B. The population has reached its carrying capacity.
C. Density-independent factors have slowed the growth
of the population.D. Immigration into the
population has reached the maximum limit.
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1. A2. B3. C4. D
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Population EcologyChapter 4
Standardized Test Practice
Which organism is the best example of a k-strategist?
A. wolf
B. grasshopper
C. rabbit
D. whale
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Population Ecology
Glencoe Biology Transparencies
Chapter 4
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Population Ecology
Image Bank
Chapter 4
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population density
dispersion
density-independent
factor
density-dependent
factor
population growth rate
emigration
immigration
carrying capacity
Population Ecology
Vocabulary
Section 1
Chapter 4
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demography
demographic transition
zero population growth (ZPG)
age structure
Population Ecology
Vocabulary
Section 2
Chapter 4
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Population EcologyChapter 4
Visualizing Population Characteristics
Characteristics of Population Growth
Animation
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Population EcologyChapter 4
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Population EcologyChapter 4