Vocabulary
The number of organisms of the same species in an area
Population
In a pond, 20 baby frogs are born in the spring. What happens to the overall frog population size, assuming no other changes?
It increases
True or False: Limiting factors can be abiotic or biotic
True
What is the carrying capacity in this graph?
2000
What would happen if the birth rate and death rate are exactly the same one year?
No population change
What is Emigration?
Organisms leaving a population to go somewhere else
If the death rate is higher than the birth rate, what happens to the population?
It decreases
What is the definition of a limiting factor and give 3 examples
A factor that keeps the population size in check. It controls the population (food, water, space, sunlight, predation, etc.)
What would happen to the carrying capacity of the shark population if the number of fish decreases?
It goes down
What scenario would cause the butterfly population to increase?
A. Emigration of butterflies
B. Death rate is higher than birth rate
C. Birth rate is higher than death rate
C. Birth rate is higher than death rate
The number of babies born in a single year
Birth Rate
If a population is below the carrying capacity and there is an abundance of food one year, what will happen to the population?
It will increase
Name 3 examples of density independent factors
Storms, hurricanes, tornadoes, earthquakes, habitat loss (etc.)
In a cold tundra environment, what are 3 factors that could impact the carrying capacity?
Temperature, amount of snow, availability of food
In a forest ecosystem, a long drought causes plants to die, leading to a decline in the deer population. What role does the drought play?
A. Abiotic limiting factor
B. Biotic Limiting factor
C. Increase of the deer population
D. Increase of the plant population
A. Abiotic limiting factor
What is Carrying Capacity?
The maximum number of organisms that can be supported by an ecosystem
Why can't organisms reproduce constantly to build populations of an unlimited size?
The resources in any ecosystem are limited
In the desert, cacti plants need around 8 inches of rain a year in order to survive. One year only 5 inches of rain falls and the cacti struggle to survive. What is the limiting factor?
Amount of rain/water
How are limiting factors and carrying capacity related?
The limiting factors directly determine the carrying capacity. EX: If there is not enough food, this changes the carrying capacity
If you are studying all the oak trees, squirrels, and blue jays interacting in a park, what level of organization are you studying?
Community
A factor in the environment that does not depend on the number of members in a population
Density Independent Factors
In a prairie, there are 1000 bison. In one year, 100 bison are born and 250 die. Then, 300 emigrate from the population and 425 join the population. What is the final population total at the end of the year?
975 bison
Canine Parvovirus is a disease that causes dogs to vomit and have digestive issues. It spreads when infected dogs are in contact with each other, what type of limiting factor is this?
Density Dependent
Why does a population growth curve eventually flatten out or level off in a stable ecosystem?
The ecosystem has reached carrying capacity
Which of the following scenarios would have the lowest carrying capacity for the deer?
A. National forest with thousands of acres of land
B. National forest with little fresh water and food
C. National forest with a lot of food and water
D. National forest with little to no wolves
B. National forest with little fresh water and food