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IB ESS formulas

formulas for ESS

TermDefinition
Net primary productivity calculated by subtracting respiratory losses (R) from gross primary productivity (GPP). NPP= GPP - R
Gross secondary productivity (GSP) the total energy or biomass assimilated by consumers and is calculated by subtracting the mass of fecal loss from the mass of food consumed GSP = food eaten - fecal loss
Net secondary productivity (NSP) calculated by subtracting respiratory losses (R) from GSP. NSP = GSP - R
CBR (crude birth rate) no of births / population size x1000
CDR (crude death rate) # of deaths / population size x 1000
NIR (natural increase rate) CBR - CDR/10 (migration is ignored)
TFR (total fertility rate) average no of children/woman
DT (doubling time) time in years to double the population size
Respiration glucose + oxygen -> carbon dioxide + water
Photosynthesis carbon dioxide + water -> glucose + oxygen
Lincoln index measures the abundance of motile organisms using capture-mark-recapture n1*n2/ nm - n1 is the number caught in the first sample - n2 is the number caught in the second sample - nm is the number caught in the second sample that were marked.
Simpson diversity index measures species diversity in two similar habitats. D= N(N-1)/ (n-1) - D is the Simpson diversity index. - N is the total number of organisms of all species found. - n is the number of individuals of a particular species.
% change change (final - original)/ original number × 100
Created by: Justin.magers
Popular Ecology sets

 

 



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