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Bold letters: essential elements

Bold letters: essential elements

Fig. 2.11 Stoichiometric ratios (C/N vs N/P) in a limnetic trophic chain of four members (alga, water flea, planktivo-rous white fish, perch). The composition of algae (unlike animals, higher plants or bacteria) does thoroughly depend

on nutrient contents of the lake and intensity of incident light (Loladze et al. 2000). Arrows point at the corresponding consumers in the trophic chain (from Franzle et al. 2005)

Table 2.12 C/N ratios of different organisms vs terminal electron acceptor, ambient redox potential: the lower the redox potential of the terminal electron acceptor, the larger C/N will become

Kind of organism

Terminal e-acceptor

(oxidant)

C/N (stoichiometric ratio)

epH = 7 (minimal e value where terminal oxidant can still be detected in neutral soil) [V]

Animal

Fungus (aerobic) Heterotrophic iron bacteriumb Clostridium

Dioxygen

Dioxygen

Nitrate

Fe(III)

Sulfate

H3O+

Organic carbonyl compounds

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