Growth and reproductive patterns of <Emphasis Type="Italic">Undaria pinnatifida</Emphasis> sporophytes in a cultivation farm in Busan,Korea |
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Authors: | Han Gil Choi Young Sik Kim Soon Jeong Lee Ki Wan Nam |
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Institution: | (1) Faculty of Biological Science and Research Institute for Basic Science, Wonkwang University, Iksan, Jeonbuk, 570-749, South Korea;(2) School of Marine Life Science, Kunsan National University, Kusan, Jeonbuk, 573-701, South Korea;(3) Department of Marine Biology, Pukyong National University, Busan, 608-737, South Korea |
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Abstract: | Monthly growth and reproduction of Undaria pinnatifida sporophytes were examined over a period of 5 months in a cultivation farm in Korea. A total of 11 characters of Undaria were measured to determine a reliable morphological character representing its growth and reproduction. Plant weight of Undaria sporophytes increased steadily over the experimental period, but it increased in four different ways. Undaria pinnatifida increased body weight by growth in length and width (October–early December), and by growth in width with the thickening
of blade and stipe when sporophytes began to be fertile (December–January). In the middle of January, growth in length and
width had almost stopped with the maturation of Undaria sporophytes. Finally, the weight of Undaria increased again by growth in width at the end of February. Present results indicate that Undaria sporophytes increase body weight by growth in length and width at different times, and the relationship between reproduction
and vegetative growth is exclusive. Plant weight was positively correlated and fitted well with stipe width and blade width.
The blade of Undaria was very thin (ca. 254 μm) and breakable by wave action, but its stipe was strong and relatively thick (ca. 8.7 mm). Furthermore,
the fertility of U. pinnatifida was fitted better with stipe width than blade width. Thus, we suggest that the stipe width is the most feasible character
with which to estimate the growth and reproduction of U. pinnatifida sporophytes in the cultivation farm. |
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Keywords: | aquaculture growth reproduction stipe width sporophyte Undaria pinnatifida |
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