Abstract
Laboratory experiments on sporangial germination and zoospore activity in Coelomomyces opifexi which utilises a suparlittoral environment are described. Sporangial germination depends upon (a) salinity of the medium used and (b) whether the sporangia were derived from living or deceased larvae. Sporangia from living larvae germinated almost instantaneously in distilled, tap, brackish pond and sea water with a salinity of 4.2‰ There was only partial germination at a salinity of 17‰, and none at all in 35‰ (full sea water). Sporangia from deceased larvae required a conditioning of 7 days or more under moisture at 23°C or 28°C before germination. Sporangia from living and moribund larvae became thick-walled and darker when exposed to a salinity of 8.5‰ or higher. These, likewise, required a conditioning period for germination. The biological and ecological significance of these observations are discussed.
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