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It refers to the group of individuals of the same species inhabiting the same area. It is characterized by the total number of individuals and the space they occupy per unit area.
It refers to the group of individuals of the same species inhabiting the same area. It is characterized by the total number of individuals and the space they occupy per unit area.
Population
It is the precise number of individuals in an area. It may have a large or small number of individuals that are distributed densely or sparingly in a local area
It is the precise number of individuals in an area. It may have a large or small number of individuals that are distributed densely or sparingly in a local area
Population Size
It is used to make inferences about the population as a whole.
It is used to make inferences about the population as a whole.
Sampling Method
Two methods are use:
Two methods are use:
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For immobile or slow-moving organisms like plants. It is a square structure that must be placed at random locations within the habitat enough times and count the number of individuals within its boundaries.
For immobile or slow-moving organisms like plants. It is a square structure that must be placed at random locations within the habitat enough times and count the number of individuals within its boundaries.
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For smaller mobile organisms such as mammals. a method in which animals are captured, marked, and released back into the environment to mix with the rest of the population. Later,
a new sample is captured and counts how many of these marked animals are in the new sample.
For smaller mobile organisms such as mammals. a method in which animals are captured, marked, and released back into the environment to mix with the rest of the population. Later, a new sample is captured and counts how many of these marked animals are in the new sample.
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It indicates how crowded a population is. It is a measurement of population per unit area or unit volume
It indicates how crowded a population is. It is a measurement of population per unit area or unit volume
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It is the distribution of the individuals throughout their range in an area.Individuals within a population can be distributed into different patterns
It is the distribution of the individuals throughout their range in an area.Individuals within a population can be distributed into different patterns
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It occurs when individuals aggregate in patches like wolf pack attack prey, mushroom on a rotting log, and so on
It occurs when individuals aggregate in patches like wolf pack attack prey, mushroom on a rotting log, and so on
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It occurs when individuals are evenly distributed and usually seen in territorial animal species like penguins that maintain a defined territory for nesting.
It occurs when individuals are evenly distributed and usually seen in territorial animal species like penguins that maintain a defined territory for nesting.
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It is a unique pattern where each individual's position is independent of other individuals—for example, plants established by windblown seeds in the forest.
It is a unique pattern where each individual's position is independent of other individuals—for example, plants established by windblown seeds in the forest.
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births of new individuals (natality rate).
births of new individuals (natality rate).
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permanent arrival of new individuals into the population
permanent arrival of new individuals into the population
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deaths of individuals (mortality rate)
deaths of individuals (mortality rate)
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movement of individuals out of a population
movement of individuals out of a population
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It describes populations that increase in numbers without any limits to their resources or encounter some other limitation. The important concept of this growth rate model is that the population size is increasing at a greater rate. When the population size, N, is plotted over time, it forms a J-shaped growth curve.
It describes populations that increase in numbers without any limits to their resources or encounter some other limitation. The important concept of this growth rate model is that the population size is increasing at a greater rate. When the population size, N, is plotted over time, it forms a J-shaped growth curve.
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It is a more realistic model of population growth in which it introduces limits to reproductive Growth. As the population size increases, resources will be depleted, and the growth rate will slow down due to limited resources. Populations do not exist in isolation and share the environment with other species, competing with them for the same resources.
It is a more realistic model of population growth in which it introduces limits to reproductive Growth. As the population size increases, resources will be depleted, and the growth rate will slow down due to limited resources. Populations do not exist in isolation and share the environment with other species, competing with them for the same resources.
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The maximum population size that a particular environment can sustain is called
The maximum population size that a particular environment can sustain is called
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o This Growth is not dependent on the density of the population. The population increases at a rate determined by its biotic potential. Many
factors influence the death rate regardless of its density and may only be slowed down by severe environmental catastrophes such as drought,
storm, earthquakes, and the like. As a result, it reduces the population regardless of population size.
o This Growth is not dependent on the density of the population. The population increases at a rate determined by its biotic potential. Many factors influence the death rate regardless of its density and may only be slowed down by severe environmental catastrophes such as drought, storm, earthquakes, and the like. As a result, it reduces the population regardless of population size.
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o This is a growth influenced by the density of the population. As the density of the population increases, the resources become limited. Thus, it affects the availability of specific resources to other species and can influence population size further. Examples of this are food supply, nesting sites, mating partners, and so on
o This is a growth influenced by the density of the population. As the density of the population increases, the resources become limited. Thus, it affects the availability of specific resources to other species and can influence population size further. Examples of this are food supply, nesting sites, mating partners, and so on
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It is the statistical analysis of the human population, which encompasses the size, distribution, structure, and changes in the population that occur over time.
It is the statistical analysis of the human population, which encompasses the size, distribution, structure, and changes in the population that occur over time.
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It is the proportion of people by age, sex, ethnicity, education, and other parameters.
It is the proportion of people by age, sex, ethnicity, education, and other parameters.
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It refers to the actual production of offspring. It depends on various factors like physical health and nutrition, sexual behavior, culture, emotions, economics, way of life, etc. Thus, fertility rates vary among countries and cultures.
It refers to the actual production of offspring. It depends on various factors like physical health and nutrition, sexual behavior, culture, emotions, economics, way of life, etc. Thus, fertility rates vary among countries and cultures.
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It is a measure of the number of deaths in a particular population depending on various factors like age and gender distribution.
It is a measure of the number of deaths in a particular population depending on various factors like age and gender distribution.
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It refers to the average survival time for an individual.
It refers to the average survival time for an individual.
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It is the physical movement of people from one place to another. It is divided into two groups of factors: push and pull.
It is the physical movement of people from one place to another. It is divided into two groups of factors: push and pull.
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The push factors are things that an immigrant is unfavorable about the area he is coming from, while pull factorsinterest the immigrant in the new place
The push factors are things that an immigrant is unfavorable about the area he is coming from, while pull factorsinterest the immigrant in the new place
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These are important data from sources like statistics registries (Phillipine Statistics Office/PSA) and censuses. Statistics registries track all status on births, deaths,
marriages, migrations, and the like. The national government usually conducts censuses. Its main goal is to count every person in the country and collect information on such variables as age, sex, marital status, education, employment status, and occupation.
These are important data from sources like statistics registries (Phillipine Statistics Office/PSA) and censuses. Statistics registries track all status on births, deaths, marriages, migrations, and the like. The national government usually conducts censuses. Its main goal is to count every person in the country and collect information on such variables as age, sex, marital status, education, employment status, and occupation.
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It is a population parameter that refers to the number of individuals of each sex and age group and is often represented by a bar graph called a population pyramid.
It is a population parameter that refers to the number of individuals of each sex and age group and is often represented by a bar graph called a population pyramid.
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It refers to the rate of males to females in a population
It refers to the rate of males to females in a population
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It is a statistical tool that summarizes the number of deaths of a population. It yields information about longevity and gives a reasonable estimate of life expectancy.
It is a statistical tool that summarizes the number of deaths of a population. It yields information about longevity and gives a reasonable estimate of life expectancy.
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Study Notes
Population Ecology
- Refers to the study of how populations interact with their environment.
- Population density is the number of individuals per unit area.
- Population size is the total number of individuals in a population
- Population distribution refers to how individuals are spread out in an area.
- Population growth is the change in the number of individuals in a population over time.
- Carrying capacity is the maximum population size that an environment can sustain.
- Natality is the birth rate.
- Mortality is the death rate.
- Immigration is the movement of individuals into a population.
- Emigration is the movement of individuals out of a population.
Population Dynamics
- Quadrat sampling is used to estimate population size for immobile or slow-moving organisms.
- Mark-recapture sampling is used to estimate population size for mobile organisms.
- Clumped distribution occurs when individuals aggregate in patches.
- Uniform distribution occurs when individuals are evenly distributed.
- Random distribution occurs when individuals are distributed independently of each other.
Population Growth Models
- Exponential growth occurs when a population increases at a constant rate.
- Logistic growth occurs when a population’s growth slows down as it approaches carrying capacity.
- Density-dependent factors are factors that influence population growth based on the density of the population.
- Density independent factors are factors that influence population growth regardless of the density of the population.
Human Population Growth
- Demography is the study of human populations.
- Population structure refers to the composition of a population by age, sex, and other characteristics.
- Fertility rate is the average number of children born per woman.
- Mortality rate is the death rate.
- Life expectancy is the average lifespan of an individual.
- Migration is the movement of people from one place to another.
- Push factors are reasons why people leave their homes, such as war, famine, or poverty.
- Pull factors are reasons why people move to a new place, such as job opportunities, education, or family.
Population Data
- Statistics registries track births, deaths, marriages, and migrations.
- Censuses are surveys that count every person in a country and collect data on their characteristics.
- Population pyramid is a bar graph that shows the age and sex distribution of a population.
- Sex ratio is the number of males to females in a population.
- Life table is a statistical tool that tracks death rates in a population.
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