Abstract
At the Sulphur Bay Wildlife area on Lake Rotorua, shore and water birds are exposed to natural H2S at concentrations of 125 to 3900 ppbV from continuous shore and lake sources. Nevertheless, 62 bird species, 45 native, have been recorded there. Regular residents include Red-Billed Gull, Dabchick Mallard Duck, Black Swan and Caspian Tern. Some, the Red Billed Gull and Little Black Shag, have initiated colonization within the past half-century. We suggest that exposure to H2S at the levels reported here may be less of a biohazard than previously supposed.
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