Growth rates of Kappaphycus alvarezii and Eucheuma denticulatum in occasionally exposed and fully submerged environments
1993
Baltazar, G.Q. (Mindanao State Univ., Sanga-sanga, Bongao, Tawi-Tawi (Philippines). Tawi-Tawi Coll. of Technology and Oceanography)
A study to test the effects of occasionally and fully submerged environments and three water depths (5, 10, and 15 cm) on the growth of Kappaphycus alvarezii (Doty) Doty and Eucheuma denticulatum (Burman) Collins et Hervey was conducted at Tawi-Tawi, Philippines from Dec 1983 to Mar 1984 using randomized complete block design. Seedlings of both species with an initial weight of 110 g each were tied to monofilament nylon string and planted at desired distances by tying the ends of the nylon to the wooden stakes fixed earlier. Results indicate that both environments had comparable soil and water properties. Organic matter content in fully submerged environment was higher. The soils of both environments had high levels of potassium. Growth of Kappaphycus alvarezii in terms of length of first order and second-order branches, their number and weight per plant was higher than Eucheuma denticulatum. The growth of both species in terms of same components listed above was also higher in fully submerged environment than occasionally exposed environment. The effect of planting distances on the growth of the two species in both environments was insignificant. Profuse growth of other seaweeds and seagrasses negatively affected the growth of both species in the latter environment. There was no such growth in the fully submerged environment. In general, the growth of Eucheuma denticulatum, because of its fragile nature and susceptibility to adverse conditions such as strong waves, was poorer than Kappaphycus alvarezii
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