Unit 1 - Practical Skills

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  • Created on: 28-04-12 19:38
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Unit 1 ­ Practical Skills: Species Diversity and Population Sampling
The Simpson Diversity Index is a way of measuring diversity in an area.
N = Total number of all species found
n = Total number of specific species found
Richness = amount of different species in a sample (regardless of individual number)
Evenness = how varied the species are individually e.g. 50A 50B 50C = even; 1A 2B 147C = uneven
Density = number of a species per unit measured
Sampling
Random = Random methods to produce objective results: Random Number Generator, Random Walks...
Dropping quadrats/points to randomly sample species numbers
Systematic = regular intervals plotted to sample, also subjective and even in coverage
>Line/Belt Transect ­ Line or rope set up and samples taken regularly (systematically) along the length
Stratified Sampling = Adjustments to sampling methods, taking into account environmental changes
e.g. over two rock types: sampling method would be split proportionally between both areas...
Other Methods
ACFOR Abundance Scale ­ Unpractical to count organism? Use this subjective scale:
Abundant-Common-Rare-Frequent-Occasional-Rare
Lincoln Index ­ N = estimate for total pop. size
N1/2 = Number of individuals captured on 1st/2nd trapping
m = Number of tagged individuals (from 1st trapping) to also be found in 2nd sample
Kick Sampling ­ for aquatic organisms Tüllgren
Funnel>>

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Light Traps ­ for collecting moths at night ­ attraction to light
Pitfall Traps ­ pit containing alcohol, which kills and preserves fallen insects
Pooters ­ Basically anything which sucks insects into a container e.g.…read more

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