# Studying Biodiversity

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What is Biodiversity?
The variety of living organisms in an area
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What is a species?
group of similar organisms able to reproduce to give fertile offspring
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What is a Habitat?
Area inhabited by species. includes physicals factors (soil and temp range) and the living (biotic) factors (availability of food and presence of predators)
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What is Habitat diversity?
Number of different habitats in an area
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What is Species Diversity?
Number of different species and the abundance of each species in an area
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What is genetic diversity?
The variation of alleles within a species (or population of species )
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How can you avoid bias results in a sample?
You would use a random sample technique e.g. divide sample space unto a grid using measuring taped and use a random number generator to select coordinates
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When is it necessary to use a non-random sample techniques?
when there is a lot of variety in the distribution of species in the habitat and you want to make sure all the different areas are sampled
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What are the three types of non-random samples?
Systematic: samples taken at fixed intervals along a line . Opportunistic: samples chosen by investigator (simple but biased). Stratified: different areas identified and sampled separately in proportion to their habitat as a whole.
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Describe species richness
Number of different species in an area. Higher number of species is a higher number. Measured by taking random samples of a habitat and counting number of different species
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Describe species evenness
measure of relative abundance of each species in an area. The more similar the population size of each species the greater the species evenness. measured by taking random samples of habitat and counting number of individual of each different species.
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What does the Simpson's index of diversity measure?
Diversity. Takes into account species richness and evenness. always between 1 and 0. closer to one the more diverse the habitat.
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What is the formula for the Simpson's index of diversity?
1-(sum of (n/N)^2) where n= total number of individuals in one species N= Total of organisms of all species
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## Other cards in this set

### Card 2

#### Front

What is a species?

#### Back

group of similar organisms able to reproduce to give fertile offspring

### Card 3

#### Front

What is a Habitat?

### Card 4

#### Front

What is Habitat diversity?

### Card 5

#### Front

What is Species Diversity?