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Acetylene reduction (AR) rates by cyanobacteria epiphytic on a moss at Marion Island (46 degrees 54' S, 37 degrees 45' E) increased from -5 degrees C to a maximum at 25 to 27 degrees C. Q(10) values between 0 and 25 degrees C were between 2.3 and 2.9, depending on photosynthetic photon flux density. AR rates declined sharply at temperatures above the optimum and were lower at 35 degrees C than at 0 degrees C. Photosynthetic photon flux density at low levels markedly influenced AR, and half of the maximum rate occurred at 84 mumol m s, saturation occurring at ca. 1,000 mumol m s. Higher photosynthetic photon flux density levels decreased AR rates. AR increased up to the highest sample moisture content investigated (3,405%), and the pH optimum was between 5.9 and 6.2. The addition of P, Co, and Mo, individually or together, depressed AR.

Effects of Abiotic Factors on Acetylene Reduction by Cyanobacteria Epiphytic on Moss at a Subantarctic Island