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The aims of this study were to investi\u5373te the ecology of reproductive processes of Sargassum alternato-pinnatum, and to develop a method to induce the release of embryos from this species using deep ocean water. The effects of water temperature and air exposure on the number of embryos released from mature thalli of S. alternato-pinna\u98e2m were examined. The main findings were as follows: more embryos were released into surface ocean water (from a depth of approx. 1 m) when the temperature was decreased by heat exchange with deep ocean water (from a depth of approx. 320-340 m). When the release of embryos was delayed, there was also a delay in withering of the algal thalli. Fewer embryos were released from the thalli after they were exposed to air, but the thalli were able to recover their embryo-releasing capacity. These results suggested that environmental changes such as shifts in water temperature, depth, etc. will greatly influence algal reproductive processes. There were at least three separate embryo-release events in S. alternato-pinnatum. In conclusion, it is possible to obtain many embryos from this alga by lowering the temperature of surface ocean water by heat exchange with colder deep ocean water.<\/p>\n","protected":false},"excerpt":{"rendered":"
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