2.1 Study Guide

Question 1

Population

Answer 1

All the inhabitants in a specific species of a given geographic area.

Question 2

Population Density

Answer 2

Describes how individuals concentrate within the same area.

Question 3

Population Distribution

Answer 3

Describes how individuals of a population spread out in a given area.

Question 4

Clumped

Answer 4

Resources: clumped
Social Interactions: Important social network.

Question 5

Uniform

Answer 5

Resources: scarce
Social Interactions: competition within population/territorial.

Question 6

Random

Answer 6

Resources: abundant throughout
Social Interactions: not strong social interactions affecting distribution.

Question 7

Clumped examples (at least three).

Answer 7

wolves
ants
bison

Question 8

Uniform examples (at least three).

Answer 8

tigers
panthers
wolf spiders

Question 9

Random examples (at least three).

Answer 9

dandelions
berry bushes
poison ivy

Question 10

Why might a population want to use clumped distribution?

Answer 10

To protect their population from predators.

Question 11

Why might a population want to use uniform distribution?

Answer 11

To gain the most resources in a paucity environment.

Question 12

Why might a population want to use random distribution?

Answer 12

The absence of competition between inhabitants for resources.

Question 13

Mark -Recapture Formula

Answer 13

total marked/total population =recaptured marked/recaptured population

Question 14

Qudrate

Answer 14

Each of a small area of a habitat (typically one square meter) selected at random to determine the number of of plants or animals in a population.

Question 15

Lincoln - Peterson Index

Answer 15

N = M x S / R
N = population size estimate
M = marked individuals released
S = size of second sample
R = marked individuals recaptured

Question 16

Random Sampling Formula

Answer 16

number of organisms in sample/area of sample = total # of organisms/ total area

Question 17

How do you solve for x ?
3/5 = 9/x

Answer 17

First cross multiply.
3x = 45
Then get x by itself by dividing each side by 3.
x = 15

Question 18

Your quadrat numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Number of dandelions 1, 2, 7, 5, 1, 2, 4, 1, 0, 3
Estimate the total number of dandelions in a 1000 m^2 field.

Answer 18

First you would add up the number of dandelions
1+2+7+5+1+2+4+1+0+3
= 26
Then you would plug in you data points
26/10 =x/1000
Cross multiply
26,000 = 10x
Get x by itself by dividing each side by 10.
2600 = x
approximately 2600 dandelions in the field

Question 19

What are ABIOTIC attributes that affect a populations’size?

Answer 19

1. sunlight and temperature
2. precipitation / water
3. soil/nutrients

Question 20

What are BIOTIC attributes that affect a populations’size?

Answer 20

1. other living organisms
2. prey (food)
3. competitors
4. predators, or parasites, or disease

Question 21

What are the four ways to count a population?

Answer 21

1. Direct Count
2. Indirect Count
3. Random Sampling
4. Mark-Recapture