Population Patterns
A "J curve" is also known as:
Exponential growth
Two organisms that are fighting over the same resources.
Competition
What role did the wolves play in the ecosystem of Yellowstone Park? For example, plants are producers.
Predator
Malthus hypothesized that human population would increase in this way:
Exponentially.
Total population relative to land size.
What is population density?
When a population reaches this threshold they are met with environmental resistance and the population declines. Represented with the letter "K".
Carrying capacity.
A wildfire is an example of a:
Density independent factor
What is the name of the concept that describes how predators stabilize the other trophic levels within an ecosystem, typically by limiting the population of primary consumers?
Trophic cascade
Malthus hypothesized that access to resources would increase in this way:
Linearly
A population of 500 birds lives in an area of 10 square miles. What is the population density?
50 birds per square mile
What population pattern refers to the cycle of population increase and decrease of two organisms. This will have a "lag time".
Predator-prey cycle
Disease is an example of a:
Density dependent factor
How did the reintroduction of the wolves affect the population of elk?
The population of elk decreased
What did Malthus not anticipate when he created Malthusian theory?
The ability of humans to increase their carrying capacity through technology and innovation.
Species that have high birth rates and high death rates. Salmon are an example of this.
R selected species
What could cause a sharp decline in a stable population?
Disease, natural disaster.
Provide an example of a density independent limiting factor.
Natural disasters, drought, etc.
Reintroduction of the wolves caused the beaver population to ____.
Increase
What perspective refers to the modern day Malthusian ideology? Characteristics include:
- Concern for resource availability
- Concern for climate change due to increasing population
- Views increasing population as a problem
Neo-malthusian
A population had 25 live births in 2022. In the same time there were 22 deaths. What was the population growth in 2022?
3
In this population pattern one species will increase and the other will decrease.
An example of this was two strains of bacteria being grown in the same environment.
Competition
Provide an example of a density dependent limiting factor.
Disease, competition, predation.
This is the term for the number of offspring a species typically has in their lifetime:
Fecundity
This is the name of the ideology that rejects Malthusian theory.
Anti-Malthusian
Species that have low birth rates but typically live until old age.
K selected species