Figure 1. Richards (1965a). Map of Lake Nitinat, Vancouver oa and the 
distribution of oxygen and sulphides observed there June 10-12th, 1964. Oxygen 
and total sulphide isopleths are in ywg.-at./1. The map and profile are reproduced 
through the courtesy of Dr. T. C. Northcote of the University of erisishs Columbia. 
5 contours, ug.-at./1.,- — — —; Sr contours, yg.-at./1. 
Table 1.—Order of oxidation of organic matter in the marine environment 
AG?(w) Keal 
CH20—CO,/O0.H+—-H2O______ ee oe ee ot ~—29. 85 
CH,0 —CO;/NO;- —N, a ee a ae ee en ae ere as [oe — 28. : 85 
CH,0->CO3/Mn0O,>MnOO,e usvsld 6 vel Lg DONO be lapiises_ — 22, 70 
CH20 >COn/:NOs- NN Ost uesees us cational eats @ sgdtie gle — 20.88 
CH,.O —CO;/NO.- —N H3+ BS LS oy Seen hs Ree ee Pie eee seem td 5 See {4.22 ee —19. 05 
CH,O0—CO,./FeOOH >FeCO3___- | pahifatnpet Mies pet rare GET — 8. 88 
CH,0—HC00O-/CH,0>CHLOH_ _ 2 lee 2 ee eee ee —§. 95 
Fermentation is an organic redox reaction where 1 organic substance gets 
reduced by oxidizing another organic substance. In alcoholic fermentation ise 
products are metastable with respect to CO, and CH)! 
CH,0C0,/SO.-FHS 2B G MOF SMUOO8 10 ehiGoh OF eIMiores —6. 06 
CH.0>CO,/CO.-CHg.a2si_ ssl isiew adit__bojoariias L 2 £4 = 5. 53 
RELIES fermentation) 
Oxygen-deficient marine environments have developed when tie 
water circulation is so slow that oxygen consumption is greater than 
oxygen replenishment. Such conditions can occur in the open ocean. 
For example, the eastern tropical North Pacific Ocean has such low 
oxygen concentrations that denitrification is taking place (Brandhorst, 
1959). This situation occurs intermittently in protected fjords, inlets, 
and gulfs such as a (Nessa Saanlich Hult (V ancouver 
—t 
