Density
A group of individuals of the same species living in the same area.
What is a population?
An outbreak of this can reduce a population’s size by increasing mortality.
What is disease?
This strategy estimates population size by counting individuals in smaller, manageable plots or areas and multiplying to estimate an entire area.
What is a Sampling Method?
This type of population growth occurs when resources are unlimited, causing the population to increase rapidly in a J-shaped curve.
What is exponential growth?
This type of survivorship curve shows high survival throughout most of life, with most individuals dying at old age—typical of humans and elephants.
What is Type I?
The number of people living in a specific area, usually measured per square KM.
What is population density
When this rate (the number of individuals born per year) is higher than the death rate, a population tends to grow.
What is the birth rate?
This method involves capturing organisms, tagging them, releasing them, and later recapturing individuals to estimate population size.
What is mark-recapture?
This S-shaped growth pattern occurs when a population slows as it approaches the carrying capacity.
What is Logistic Growth?
This curve represents species that have a constant chance of dying at any age, such as many birds.
What is Type 2?
Describe a clumped dispersion pattern
What is a population of species that are right next to each other in group?
This term describes the movement of individuals into a population and increases population size.
What is immigration?
This type of population count attempts to record every individual in an area, though it’s often impractical for large or mobile species.
What is a Total Count?
This limit determines the maximum number of individuals that can live in an area where logistic growth levels off.
What is carrying capacity?
This term describes a graph that shows the number or proportion of individuals surviving at each age.
What is a survivorship curve?
What is a population that is randomly dispersed throughout the area? Example: Dandelions
This process occurs when individuals leave a population and causes population size to decrease.
What is Emigration?
Scientists using this sampling method walk along or travel a straight line and record the organisms they encounter at regular intervals.
Humans are currently experiencing this type of growth pattern.
What is exponential?
Sea turtles and oysters, which produce thousands of offspring but few survive early on, typically follow this survivorship curve.
What is Type 3?
An example of a species that uses uniform dispersion patterns.
What are cactus?
These two human-driven factors—one that contaminates habitats and one that removes individuals faster than they can reproduce—can cause sharp declines in population size.
What is pollution and overfishing?
Because animals may be born, die, move, or hide during the long amount of time it takes to count every individual, this method of measuring population size is often unreliable.
This phase of logistic growth occurs when population size is small and growth begins slowly before accelerating.
Changes in this factor—such as improved medical care, habitat loss, or new predators—can shift a species from one curve type to another over time.
What is a the death rate?