Effects of Temperature on the Spore Release and Growth of Lithophyllum yessoense and Hildenbrandia rubra

Abstract

The effects of temperature on spore release, growth and photosynthetic efficiency of Lithophyllum yessoense and Hildenbrandia rubra were examined. L. yessoense was collected at Galnam and H. rubra was collected at Gyeokpo, Korea. The experimental temperatures were different for spore release (10, 15, 20℃), sporeling growth (10, 15, 20, 25, 30℃) and photosynthetic efficiency (10, 15, 20, 25℃). All other culture conditions were the same: 34 psu, 12:12 LD and 50 μmol photon m -2 s -1 . Spore liberation was maximal at 10℃ for L. yessoense and at 20℃ for H. rubra. After 14 days, the surface area of L.yessoense was 0.031 mm 2 at 25℃ and for H. rubra was 0.032 mm 2 at 20℃. Sporelings of L. yessoense were a dark-red color and grew in a round shape. In contrast, H. rubra was bright pink and changed from a round shape in the early growth stage to later become flabelliform. Photosynthetic efficiency was highest between 20-25℃ in both species. In conclusion, L. yessoense and H. rubra display different physiological features based on the optimal temperatures for spore release and sporling growth.

Effects of Irradiance and Temperature on the Photosynthesis of the Crustose Coralline Algae Pneophyllum fragile (Corallinales, Rhodophyta) in the Coastal Waters of Korea

“…For Lithophyllum yessoense in Japan, the optimal water temperature for P max (5.70 mmol m −2 h −1 ) was 15 • C [36]. Moreover, the optimal temperature for the maximum photosynthesis capacity of Hildenbrandia rubra and L. yessoense distributed in Korea was 20-25 • C [24]. By contrast, the optimal temperature for the P max of Neogoniolithon sp.…”

“…Recently, studies of whitening in the coastal waters of Korea have been initiated to restore the macroalgae meadows and assess their ecological functions [1][2][3][4]. However, most of the studies focused on the monitoring of the occurrence and evolution area of whitening because of the absence of appropriate methods to estimate CCA metabolism [24,25]. P. fragile, a crustose red alga (Corallines, Rhodophyta) that is widely distributed in Australia, Canada, the Caribbean, England, Japan, Mexico, Russia, the United States, and the Mediterranean Sea, was collected to examine its morphology and anatomical characteristics [26].…”