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7543775
OCR - A-Level - Biology - Biodiversity
Description
A level Biology (AS Module 4) Mind Map on OCR - A-Level - Biology - Biodiversity, created by Josh Anderson on 04/02/2017.
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biology
as module 4
a level
Mind Map by
Josh Anderson
, updated more than 1 year ago
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Created by
Josh Anderson
about 7 years ago
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Resource summary
OCR - A-Level - Biology - Biodiversity
Measuring biodiversity
Species richness
The more different types of species present, the richer the habitat.
Observations of species present
Qualitative
Species evenness
Takes into account the population size of each species. Even when most of the species are abundant, rather than one dominant.
Observations of species and numbers of each to compare
Quantitative
Animals
Large
Careful observation of species and counting individuals
Small
Take samples of animals present, mark and capture
Mark and Recapture
Capture and mark the organisms harmlessly.
The number of captured organisms of this species is C1
Release the organisms that have been captured and marked.
Capture organisms again.
The number of captured organisms the second time around is C2.
The number of already marked organisms in this sample is C3.
Total population = (C1 x C2)/C3
E.g C1 = 3, C2 = 4, C3 = 2
(3x4)/2 = 6
Population is 6
Simpson's Diversity Index
D = 1- [∑(n/N)^2]
D = Diversity
∑ = Sum of all species [(n/N)^2]
n = Number of a particular spp of plant
N = Total number of all individuals of spp (∑n)
D will be between 0 and 1
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