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Abstract
Tintinnids survive conditions unsuitable for growth by forming cysts which are deposited in bottom sediments. Various environmental factors may influence their excystment. In this study, the effects of temperature and light on tintinnid excystment from marine sediments were examined by incubating the sediment samples in filtered seawater at different temperatures. Tintinnid excystment was initiated on Day 1 at 15, 20, and 25°C or on Day 2 at 10°C. At the higher temperatures, the number of excystments rapidly reached the maximum and the cumu-lative number of excystments during the first 5 days was greater than at the lower temperatures. Dark conditions suppressed tintinnid excystment., Dependence of excystment on temperature was different for different species. The range of temperature suitable for excystment of each species coincided with the range of water temperature above the bottom during the period when the respective species was abundant in nature. These results imply that excystment plays an important role in increasing tintinnid populations in coastal waters.
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