Chapter 9 - The Living world Flashcards
Populations and communities
1
Q
What is a population?
A
A group of individuals of the same species, living in a shared space at the same time.
2
Q
What are the three characteristics used to describe a population?
A
- Size: how large?
- Density: how packed?
- Distribution: where?
3
Q
What are four factors that affect population size?
A
- Births
- Deaths
- Immigration
- Emigration
4
Q
What happens to the size of a population when the births and immigration increase?
A
Population goes up (increases)
5
Q
What is the equation that determines the number of individuals per one unit of area or volume (population density)?
A
Total space/area
6
Q
Try this example: In Sarasota Bay, 122 dolphins were found in 100 km^2. Calculate the population density.
A
1.22 dolphins/per km^2
7
Q
What are the three types of population distribution?
A
- Uniform
- Random
- Clumped
8
Q
What characteristics belong to a uniform population
A
Organisms spread out in a fairly regular pattern
