Population And Characteristics (MC AND SA On The Final) Flashcards
Explain the difference between exponential and logistic population growth
Exponential: unrestricted forming a J curve
Logistic: considers carrying capacity forming S curve
What is carrying capacity give 2 examples of limiting factors that create it
It’s the maximum population an environment can substain
The bison population in the grasslands biome covers an area of 200 km² initially there were 500 bison living in this area over the next several years conservation efforts and natural reproduction brought the population up to 750 bison and the population has expanded the range to 300 km²
a) what was the initial population density of the bison?
b) what is the new population density of the bison?
C) did the population density increase or decrease by how much?
a) 500/200 = 2.5 bison/km^2
b) 750/300=2.5 bison/km^2
c) stayed the same
In the Arctic region researchers are studying the population of Arctic foxes at the start of the year. The Arctic fox population is 120 individuals over the course of the year 30 foxes were born 10 foxes immigrate into the area 15 foxes died due to harsh weather and 5 foxes emigrate.
a) calculate the net population change over the year. Use the formula: net change = (births + immigration)-(deaths+emigration)
B) what is the population growth rate percentage for the Arctic fox population during this year? Use the formula: population growth rate %= net change/initial population x 100
c) did the Arctic fox population increase or decrease? How do you know?
a) (30+10)-(15+5) = 20
b) 20/120x100=16.67%
C) increased because a percent is positive and the net population changes positive. Positive percentage: increase, negative percentage: decrease
