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Articles by H. Hidir
Total Records ( 2 ) for H. Hidir
  M.K. Abu Hena , K. Misri , B. Japar Sidik , O. Hishamuddin and H. Hidir
  Photosynthetic and respiration responses were measured in situ at different depths and under a variety of light regime for seagrass Thalassia hemprichii from coastal area of Teluk Kemang, Port Dickson, Malaysia. The photosynthesis and respiration rate was measured from evolution of oxygen from the seagrass enclosed in glass cuvet. The photosynthetic rate at 0.5 m was higher (0.429 ± 0.086 mg O2/hr/g fr wt.) than at 2.0 m depth (0.289 ± 0.034 mg O2/hr/g fr wt.). Respiration rate was not significantly different at two depths. In laboratory study, the light saturation of T. hemprichii was reached at 400-800 μmol/m2/sec, whereas, the compensation point was around 20 μmol/m2/s. The photosynthesis was relatively constant at light intensity up to 1600 μmol/m2/s. Comparing these results to in situ light measurement from the seagrass bed (1095.430±5.803 μmol/m2/s at surface water and 115.00±1.512 μmol/m2/s. at 2.0 m depth), this species depth distribution should not be light limited to a depth of about 2.0 m i.e. T. hemprichii could penetrate a depth of more than 2.0 m in this study area. However, the present field observation indicated that this species could only be found at intertidal area (1.5 - 2.0 m High Water Level) and assumed that other environmental factors i.e. current movement, water visibility and sediment status may affects the depth distribution of this seagrass in this costal water.
  M. K. Abu Hena , K. Misri , B. Japar Sidik , O. Hishamuddin and H. Hidir
  Seagrass is a valuable component contributing significantly to coastal productivity and stabilising sea floor sediments in the shallow coastal marine ecosystems. The present field case study was conducted in a monospecific patch in an intertidal seagrass bed in Port Dickson, Malaysia. Shoot density and biomass of Thalassia hemprichii were measured using 20×20 cm quadrats. Leaf growth and productivity of T. hemprichii were studied using leaf-marking method. During low tide period the habitat of this species was observed by snorkeling. The mean shoot density of T. hemprichii was 632.14×113.77 shoots/m2, with mean above ground biomass measured at 13.87×1.17 g AFDW (ash free dry weight)/m2 and mean below ground biomass 40.19±7.93 g AFDW/m2. The mean leaf growth was 7.04×1.35 mm/shoot, where maximum leaf growth was recorded 11.45 mm/shoot. The mean leaf production was 0.56×0.17 g AFDW/m2/day, where the maximum leaf production was measured at 1.00 g AFDW/m2/day. Turnover rate and relative production rate (RPR) were measured at 3.68×0.79 percent/day and 0.07×0.03 g/g AFDW/day, respectively. Plastochrone interval of T. hemprichii leaf (PIL) during the study  period  was 12.03×1.01 days. Leaves of T. hemprichii beneath the shading of macro-algae (Sargassum sp.) were comparatively longer than those existing without such shading condition. There are 8-19 horizontal rhizome nodes within two shoots and this indication that two shoots of T. hemprichii were separated at this distance.
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