Unit 2.1 Flashcards
What is population density?
The number of organisms in a given area that can affect the population due to competition for resources.
What are some different methods to find population size/density?
Quadrats, Capture and Release, Indirect Counting, ect.
What is the equation for population density?
Number of individuals/Area or volume occupied
What are the three main population metrics?
Density, Distribution, Size
What is population size?
The total number of individuals in one population
What is population distribution?
The way individuals of the same population are spread out
What is the difference between population density and distribution?
Distribution is the way organisms are spread out while density is the amount of that Organism in an area.
What is population?
All of the organisms in the same place at the same time that can reproduce together.
What distribution pattern is this: Resources are scarce and asa a result species are very territorial.
Uniform
What distribution pattern is this: A certain fish species tends to gather in large groups to avoid being singled out and eaten by predators?
Clumped
What distribution pattern is this: The seeds of a plant species are distributed by wind in a field where conditions are uniform?
Random
What type of distribution would random sampling work best for?
Uniform
What are the factors that affect population size?
Intrinsic, Biotic, and Abiotic factors.
What are some abiotic factors that influence population size?
Soil/Nutrients, Sunlight and Temperature, Percipitation/Water
What are some Biotic factors that influence population size?
Competitors, Predators, Parasites, Disease, Prey
What is an intrinsic factor that influences population size?
Adaptations
How do you do Indirect Counting?
Count number on individuals in a small area then increase that to find larger scales
How do you do direct counting?
Count every individual
What is the formula for random sampling?
of organisms in sample divided by the area of sample = total # of organisms divided by the total area
What is the formula for mark and recapture?
Total marked organisms divided by total # of organisms = total # of organisms recaptured divided by # of recaptured organisms.
One night, you trap 40 mice, mark them, and let them go. Two nights later, you again trap 40 mice, and 12 of them are marked. What is the total number of mice in the meadow?
133
- 3 - 10
4 - - - -
- 3 - 10
- 4 - - -
- 7
Each space is 5x5. If the field is 625 m2 in area, what is the estimated size of the population?
- 7
140
What would the equation for this problem be?
One night, you trap 40 mice, mark them, and let them go. Two nights later, you again trap 40 mice, and 12 of them are marked. What is the total number of mice in the meadow?
40/x = 12/40
Since wolves hunt better in packs to kill prey, what kind of distribution do you think they have?
Clumped
