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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
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...
ACFOR Abundance Scale Unpractical to count organism? Use this subjective scale:
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
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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