# Biodiversity

HideShow resource information
• Created by: Hannah
• Created on: 14-01-14 14:37
Define species
A group with the same morphology and physiology and can breed together to produce fertile offspring
1 of 30
Define habitat
A place where an organism lives- each species has its own requirements
2 of 30
Define population
Is a group of organisms of the same species, living in the same place at the same time and able to interbreed with eachother
3 of 30
Define community
All the living organisms of all the species, living in the same place at the same time
4 of 30
Define biodiversity
The variety of habitats, communities and species in an area, and the genetic diversity within populations
5 of 30
When is it best to use random sampling?
If an area looks uniform or if it looks like the distribution is patchy
6 of 30
Why is it important to carry out random sampling?
As it isn't bias and then the data will be unrepresentative
7 of 30
What is a way to randomly sample an area?
Set out axes and use a calculator to generate random coordinates for you to place the quadrat
8 of 30
Why would you want to carry out systematic sampling?
If you wanted to see the change in vegetation etc. from one area to another
9 of 30
How would you carry out systematic sampling?
Lay out a string running in a straight line and sample the organisms that are present along the line - called a transect
10 of 30
What is a quadrat?
A square frame that marks off an area of ground/water within which you can make a thorough survey of what organsisms are present
11 of 30
Define species richness
The number of different species there are in the area you are studying
12 of 30
Define species frequency
A measure of the chance of a particular species being found within any one quadrat
13 of 30
How would you measure species richness or species frequency?
Simply record the different species that are present in the quadrat
14 of 30
Define species density
Measure of how many individuals there are per square metre
15 of 30
How would you measure species density?
Count the number of individuals of that species in each quadrat. Total the results then divide by the total area of the quadrats
16 of 30
Define percentage cover
The percentage of the ground covered by a particular species
17 of 30
How would you measure percentage cover?
Divide your quadrat up into mini quadrats, you can then decide approximately what % of the area is covered
18 of 30
How does using pin quadrats give a more accurate estimate of %age cover?
The higher the % cover the more likely a pin will touch a leaf as it is lowered. If one leaf is covering another the pin may touch both, so both are counted- less susceptible to error
19 of 30
What would a Longworth trap capture?
Small mammals e.g. mice
20 of 30
What would sweep netting capture?
Insects and invertebrates e.g. spiders
21 of 30
What is the equation for the mark, release and recapture method for estimating pop. size?
No. in first sample x no. in second sample/no. of marked animals in second sample
22 of 30
Define species evenness
Measure of the relative abundance of each species in the area we have sampled
23 of 30
What is the main data trend of an area with high species evenness?
Less variation between pop. sizes of each species
24 of 30
What is the Simpson's Index of Diversity equation?
D= 1- [ (n/N)2]
25 of 30
What does an Index of 1 represent?
High biodiversity
26 of 30
What does an index of 0 represent?
Low biodiversity
27 of 30
When sampling what do we have to ensure?
No damage is done to the organisms or habitats
28 of 30
Define genetic diversity
refers to thevariety of genetic characteristics in the genetic makeup of a species - helps them to adapt
29 of 30
Define habitat diversity
Refers to the different ecosystems e.g. Tundra, deserts, woodlands etc
30 of 30

## Other cards in this set

### Card 2

Define habitat

#### Back

A place where an organism lives- each species has its own requirements

### Card 3

#### Front

Define population

Define community

### Card 5

#### Front

Define biodiversity

## Comments

No comments have yet been made

## Similar Biology resources:

See all Biology resources »See all Biodiversity resources »