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Arshad, Azis
Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)
Earth & Planetary Sciences

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MORPHOLOGIAL PLASTICITY OF HALODULE SPECIES IN RESPONSE TO DIFFERENT ENVIRONMENTS Bujang, Japar Sidik; Nazri, Norhapizah Ahmad; Zakaria, Muta Harah; Arshad, Azis; Ogawa, Hisao
Marine Research in Indonesia Vol 33, No 1 (2008)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (8797.3 KB) | DOI: 10.14203/mri.v33i1.457

Abstract

Halodule species is widely distributed along the south and east coasts of Peninsular Malaysia, Sabah and Sarawak. Five locations were selected for the study based on different habitat characteristics; sub-tidal shoal (Merambong-2 sites; Tg. Adang Laut-2 sites), coastal lagoon (Merchang-2 sites), inter-tidal beach front (Lawas-l site) and reef atoll lagoon (Pulau Layang-Layang-l site). Samplings and collections of Halodule plants were conducted from August 2002 until May 2004. The result of the study found that Halodule species are found at depth.of -1.5 to-2.7 m in various habitats with substrates from sandy, coralline sand, calcareous sandy-mud, sandy-mud to muddy substrates and can survive in a wide range of salinity, 18-34 psu. They adapt in th,e different environmental conditions through changes in morphology. Water depth (associated with ambient light), sediment type and sediment depth have an influence on the morphology of vegetative components e.g. leaf length, leaf width, erect stem length and rhizome growth pattern. Leaf tip morphology was not affected by habitat types and the environmental characteristics. Leaf tips for H. uninervis are similar in morphology between young and mature leaves. Leaf tips for H. pinifolia varied with an obvious differences between young and mature leaf tips.
LABORATORY CULTURE OF THE SEAGRASS, Halophila ovalis (R.BR.) HOOKER F. Bujang, Japar Sidik; Huat, Lim Lai; Zakaria, Muta Harah; Arshad, Azis; Ogawa, Hisao
Marine Research in Indonesia Vol 33, No 1 (2008)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5877.478 KB) | DOI: 10.14203/mri.v33i1.500

Abstract

A small-culture system for growing of Halophila ovalis was developed. Plugs of explants were successfuly grown in the native substrate and under the light regime of ~200 imol m-2 s-1. The culturing of H. ovalis in the laboratory permitted observations on (i) the sustain growth and the development of the population, (ii) the reproductive biology (flowering and fruiting) and (iii) the pattern of seedling development from seeds to mature plants. Plants increased in density via vegetative propagation and sexual reproduction. Plants produced male, female flowers and fruits. The presence of viable seeds and seedlings demonstrated the successful pollination and sexual reproduction of H. ovalis in culture. The morphology of progressive development of H. ovalis seedlings to juvenile or young plants for H. ovalis in culture is described.
Co-Authors Huat, Lim Lai Japar Sidik Bujang Nazri, Norhapizah Ahmad Ogawa, Hisao Zakaria, Muta Harah