2.1 Bio Flashcards
What is a population?
A group of organisms of the same species in the same area at the same time.
What is population density?
The number of organisms in a population per units of area.
What is population distribution?
How a population is spread out over its range.
Why do we study populations?
They help give insights into agriculture and maintaining ecosystems.
How do we size populations?
Through direct or indirect counting.
What are a few indirect methods of counting population size? Why do we use them, and what downsides do they pose?
Mark and recapture and random sampling are popular methods of indirect counting. They are relatively efficient and reliable. They pose downsides of affecting the populations they study and impacting the species lives, as well as potentially being unreliable.
What is the population density of 512 organisms in a 4 square mile field?
128 organisms per square mile
What is uniform distribution?
All organisms equally spread out
What is clumped distribution?
Organisms group together in clusters.
What is random distribution?
All organisms randomly spread out
If a scientist marks 10 flying monkeys in a field and recaptures 200 in the next month and 40 are tagged, how many flying monkeys are there in the field?
50 Flying monkeys are expected to be in the field.
What are the types of population distribution?
Random, Uniform, and Clumped
Why do populations distribute randomly? Give an example of a population that does so.
To help extend the range and potential of finding new resources. Dandelions.
Why do populations disperse in clumps? Give an example of a population that does so.
They help protect each other and resources. Schools of fish.
Why do populations disperse uniformly? Give an example of a population that does so.
To equally spread resources and limit competition within the species. Sage plants or emperor penguins.
