9.1 Population Flashcards
Group of individuals of the same species, same time and same area.
Population
The organisms over area
Population Density
The pattern of spacing between members of a population
Population Distribution
Distribution:
- Clumped
EX: School of fish
- Live in groups
- strong social interactions
Distribution:
- Random
EX: Dandelions
- resources need to be equal throughout
- not strong social interactions
Distribution:
- Uniform
EX: Nesting penguins
- competition for resources
- spaced equal to survive
- no social interactions
Assumes equal ration between total:marked
Mark and Recapture
Assumes equal density
Random Sampling
Formula for Random Sampling
organisms in samples area/ samples area equals total population/area
Formula for Mark and Recapture
Total marked/ total size equals amount maked in Recapture/total recaptured
A herd of elephants is what type of population distribution?
Clumped
In a 100 ft^2 area, there is an unknown number of flowers. Using a 5x5 quadrat each square is 2ftx2ft. You sample five and get 10,3,4,6,2. What is the total population?
125 flowers
Ten butterflies are captured and all are marked, later 22 are recaptured and 4 of them are marked. What is the total population?
55 butterflies
What distribution pattern is best for Random sampling?
Uniform
