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eet (1967) _ 
I BIOMASS 
LOSSES THROUGH — 
RESPIRATION AND 
CARNIVORE 2 EXCRETION 
eee 
fe ece DDT ag 
° é eco 
ie & 
ADE Geld 45-0 
ee, 2% ee 
2 oS 9.2 8 
4 
CARNIVORE 1 
ef ete eaee 00° 
oe) 
ee ee 
es) 
ore 
° J. 
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e @sa e 
9 : 
e 
e 
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HERBIVORE 
CONCENTRATION of DDT residues being passed along a simple food chain is indicated 
schematically in this:diagram. As “biomass,” or living material, ,is transferred from one 
Jink to another along such a chitin, usually more than half of jt is consumed in respiration 
or is excreted (arrows); the remainder forms new biomass. The losses of DDT residues 
along the chain, on the other hand, are small in proportion to the amount that is transferred 
from one link to the next. Fer this reason high concentrations occur in the carnivores. 
