Growth rate of Gracilaria verrucosa and Gracilaria salicornia (Gracilariales, Rhodophyta) in an intertidal and semi-enclosed pond system in the Visayas, Philippines
1989
Largo, D.B. (University of San Carlos, Cebu (Philippines)) | Bacolod, P.T. | Cusi, M.A.V. | Orosco, C.A. | Ohno, M.
Field experiments on the growth rate (daily growth rate, % day(-1)) of Gracilaria verrucosa and G. salicornia were conducted from February to March and from August to September 1988. Vegetative thalli grown in the intertidal area showed higher growth rates than the ones grown in the ponds. Higher growth rates were observed in August to September than in February to March. Plants grown near the seawater surface also grew generally better than the plants on the bottom. Gracilaria verrucosa always showed higher growth rates than G. salicornia in all conditions tested. Maximum growth rates for G. verrucosa (16.4%) and G. salicornia (10.1%) were obtained from suspended thalli grown in the intertidal area from August to September. Minimum growth rates (G. verrucosa = 1.5%; G. salicornia 0.6%) were obtained from thalli grown on the pond bottom from February to March. Mean daily growth rate during the whole study period for G. verrucosa was 10.02% in the intertidal area and 4.29% in the pond. G. salicornia had means of 4.95% in the intertidal area and 1.44% in the pond. These values fall within the generally reported range of 5-10% for Gracilaria species. Dry weight to fresh weight ratio was 6.02-11.06% for G. verrucosa and 7.36-11.09% for G. salicornia
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