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Fig. 5. Consumption of oxygen and sulfide by intact gill tissue. Traces of oxygen
partial pressure (black line) and sulfide concentration (red line) over time
demonstrate a rapid decline in oxygen and a coincident rapid removal of
sulfide following bolus injections of 100 µmol l–1
Na2S (arrows along abscissa). Once anoxia is reached at 70 s with
no further oxygen consumption, consumption of sulfide injected at 100 s
continues more slowly than under normoxic conditions. Following an anoxic
bout, a subsequent addition of sulfide results in decreased rates of oxygen
and sulfide consumption and a decreased S:O2 ratio. Spontaneous
sulfide oxidation under oxygenated conditions (open circles) or anoxic
conditions (open squares) is much slower than biological sulfide consumption.
Sulfide oxidation rates in chambers with heat-killed gills (microwave oven for
1 min, see Materials and methods; data not shown) are comparable to rates
without gills, indicating that biological sulfide consumption is catalyzed
enzymatically.
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