Population Characteristics + Limiting Factors (PG)
what is a population?
a number of organisms of the same species in a given area. (bonus points if you found something other than this that isn’t a joke)
What does natality mean?
amount of births
What does PGR stand for?
Population Growth Rate
What is ZPG?
Zero population growth.
What is the type of growth that describes the population numbers skyrocketing? Hint: Not Lil Wayne
Exponential Growth
Give one reason why a population might have negative PGR
ex. high mortality- the little dudes die (so sad ):)
What reproductive strategy is making a lot of offspring and hoping some survive
R strategy
Is the human population currently undergoing exponential population growth?
No- the human population growth rate is slowing
What are the 3 stages in an age structure chart?
Pre-Reproductive, Reproductive, and Post-Reproductive
The part before exponential growth is called the _______ phase.
Lag and/or Thanos Snap
Give an example of a population dispersion
Ex. organisms are scattered unevenly, clumped together, etc.
What is the period before rapid growth in logistic growth called?
the lag phase
What event began the exponential growth phase of human population growth?
The industrial revolution
Suppose Country A has a negative PGR. What could you predict about Country A?
Countries with negative PGR tend to have strong economies. There is likely a lot of access to education and birth control
What is it called when a population goes from high birth rates and high immigration, to low birth rates and high emigration? Hint: Does not have to do with JLO.
Demographic transition
What is it called when a population stays the same size? What causes it?
its called zero growth rate. When the number of births and immigrations equals the number of deaths and emigrations.
What are the two things that subtract from the population growth rate?
Mortality and Emigration
What is carrying capacity and what is it limited by?
Carrying capacity is the maximum number of individuals in a species an environment can support for the long term. It is limited by the availability of living space, resources, challenges like predation and disease.
What is a demographic transition?
Where the birth and death rates both go down.
What type of growth has an "S-curve" shaped phase?
Logistic growth
compare and contrast density independent and density dependent limiting factors.
mate, this is a question of what you know. I don’t got a thing to put here….fine
A density dependent factor is a limiting factor in the growth of a population, the severity of which is at least partially determined by the density of the population.
What contributes to the carrying capacity?
space, amount of resources, density dependent limiting factors, etc.
How have humans "increased" the carrying capacity for humans on Earth?
Improvements to shelter, agriculture, modern medicine and hygiene, and more
Why does demographic transition happen?
access to medicine and hygiene, education is improved, people have access to family planning resources, and 100 people aren’t fighting a gorilla.
Name 3 factors that might increase a population's carrying capacity.
Medicine upgrades, more food and water availability, and chicken jockeys.