8.1 populations classroom catalyst. objectives describe the three main properties of a population....
DESCRIPTION
WHAT IS A POPULATION? A population is a group of organisms of the same species that live in a specific geographical area and interbreed.TRANSCRIPT
![Page 1: 8.1 POPULATIONS CLASSROOM CATALYST. OBJECTIVES Describe the three main properties of a population. Describe exponential population growth. Describe how](https://reader036.vdocuments.us/reader036/viewer/2022081515/5a4d1b627f8b9ab0599adf66/html5/thumbnails/1.jpg)
8.1 POPULATIONS
CLASSROOM CATALYST
![Page 2: 8.1 POPULATIONS CLASSROOM CATALYST. OBJECTIVES Describe the three main properties of a population. Describe exponential population growth. Describe how](https://reader036.vdocuments.us/reader036/viewer/2022081515/5a4d1b627f8b9ab0599adf66/html5/thumbnails/2.jpg)
OBJECTIVES• Describe the three main properties of a
population.• Describe exponential population growth.• Describe how the reproductive behavior of
individuals can affect the growth rate of their population.
• Explain how population sizes in nature are regulated.
![Page 3: 8.1 POPULATIONS CLASSROOM CATALYST. OBJECTIVES Describe the three main properties of a population. Describe exponential population growth. Describe how](https://reader036.vdocuments.us/reader036/viewer/2022081515/5a4d1b627f8b9ab0599adf66/html5/thumbnails/3.jpg)
WHAT IS A POPULATION?• A population is a group of organisms of the
same species that live in a specific geographical area and interbreed.
![Page 4: 8.1 POPULATIONS CLASSROOM CATALYST. OBJECTIVES Describe the three main properties of a population. Describe exponential population growth. Describe how](https://reader036.vdocuments.us/reader036/viewer/2022081515/5a4d1b627f8b9ab0599adf66/html5/thumbnails/4.jpg)
POPULATION DENSITY
• Density is the number of individuals of the same species in that live in a given unit of
area.
• Measure of how crowded a population is
• Larger organisms
generally have lower
population densities.
• Low population density:
More space, resources;
finding mates can be difficult
• High population density:
Finding mates is easier; tends to be more competition; more infectious disease; more
vulnerability to predators
Northern pintail ducks
![Page 5: 8.1 POPULATIONS CLASSROOM CATALYST. OBJECTIVES Describe the three main properties of a population. Describe exponential population growth. Describe how](https://reader036.vdocuments.us/reader036/viewer/2022081515/5a4d1b627f8b9ab0599adf66/html5/thumbnails/5.jpg)
POPULATION DISTRIBUTION
• Dispersion is the pattern of distribution of organisms in a
population. A population’s dispersion may be even/spaced,
clumped, or random.
• How organisms are arranged within an area:
• Random distribution:
Organisms arranged in
no particular pattern
• Even/Spaced distribution:
Organisms evenly spaced
• Clumped distribution:
Organisms grouped near resources; most
common distribution in nature
![Page 6: 8.1 POPULATIONS CLASSROOM CATALYST. OBJECTIVES Describe the three main properties of a population. Describe exponential population growth. Describe how](https://reader036.vdocuments.us/reader036/viewer/2022081515/5a4d1b627f8b9ab0599adf66/html5/thumbnails/6.jpg)
HOW DOES A POPULATION GROW?• A population gains individuals with each new
offspring or birth and loses them with each death.• The resulting population change over time can be
represented by the equation below.
• Growth rate is an expression of the increase in the size of an organism or population over a given period of time. It is the birth rate minus the death rate. It can be +, -, or 0.
![Page 7: 8.1 POPULATIONS CLASSROOM CATALYST. OBJECTIVES Describe the three main properties of a population. Describe exponential population growth. Describe how](https://reader036.vdocuments.us/reader036/viewer/2022081515/5a4d1b627f8b9ab0599adf66/html5/thumbnails/7.jpg)
BIOTIC/REPRODUCTIVE POTENTIAL
• Reproductive potential is the maximum number of
offspring that a given organism can produce.
• Many factors influence biotic potential, including gestation
time and generation time.
• Organisms with high biotic potential can recover more
quickly from population declines than organisms with low
biotic potential.
![Page 8: 8.1 POPULATIONS CLASSROOM CATALYST. OBJECTIVES Describe the three main properties of a population. Describe exponential population growth. Describe how](https://reader036.vdocuments.us/reader036/viewer/2022081515/5a4d1b627f8b9ab0599adf66/html5/thumbnails/8.jpg)
POPULATION GROWTH• Populations have the ability to
grow very quickly, however, if they have a perfect environment.
• Exponential Growth• Population growth in which the rate
of growth in each generation is a multiple of the previous generation
• Conditions are never perfect, resources are always limited.
• A population can grow exponentially, but not for long.
![Page 9: 8.1 POPULATIONS CLASSROOM CATALYST. OBJECTIVES Describe the three main properties of a population. Describe exponential population growth. Describe how](https://reader036.vdocuments.us/reader036/viewer/2022081515/5a4d1b627f8b9ab0599adf66/html5/thumbnails/9.jpg)
CARRYING CAPACITY CONT.
• Carrying Capacity• The number of individuals that can be supported by an
ecosystem• S-Shaped Curve : #Births = #Deaths
![Page 10: 8.1 POPULATIONS CLASSROOM CATALYST. OBJECTIVES Describe the three main properties of a population. Describe exponential population growth. Describe how](https://reader036.vdocuments.us/reader036/viewer/2022081515/5a4d1b627f8b9ab0599adf66/html5/thumbnails/10.jpg)
RESOURCE LIMITS• A species reaches its carrying capacity when it
consumes a particular natural resource at the same rate at which the ecosystem produces the resource.
• That natural resource is then called a limiting resource.
• The supply of the most severely limited resources determines the carrying capacity of an environment for a particular species at a particular time.
![Page 11: 8.1 POPULATIONS CLASSROOM CATALYST. OBJECTIVES Describe the three main properties of a population. Describe exponential population growth. Describe how](https://reader036.vdocuments.us/reader036/viewer/2022081515/5a4d1b627f8b9ab0599adf66/html5/thumbnails/11.jpg)
LIMITING FACTORS• Populations can’t grow forever.• Forces that slow growth in a populations are
called limiting factors.• Deaths occur more quickly in a crowded population than in a sparse population.• A certain proportion of a population may die regardless of the population’s
density.
Population
Size
Climate
Water
AvailabilityPredation
Living Space
Food
CompetitionDisease
Parasitism
Natural
DisastersHuman
DisturbanceDensity-
Dependent
Density-
Independent