Abstract:
The ecological studies of Cryptocoryne keei Jacobsen was conducted at Sg. Sedian and
Sg. Staat, Bau, Sarawak. Three quadrates (0.5 m x 0.5 m) were established at Sg. Sedian
and only one quadrate (0.5 m x 0.5 m) were established at Sg. Staat to measure the
population and the distribution of the species. Water quality analysis such as pH,
temperature, conductivity, turbidity, water flow, water depth and soil samples were taken
to measure the ambient physical parameters for both rivers. The study comprises biomass
allocation, light intensity and photosynthesis measurement. The biomass allocation were
calculated and quadrate 2 from Sg. Sedian showed the highest ratio of leaf with an
average of 0.1712 ± 0.04 (g/g), petiole with an average of 0.2895 ± 0.07 (g/g) and root
with an average of 0.5393 ± 0.07 (g/g) for shaded area with fast water flow and deep
water. A shaded area is significant high on photosynthetic gas exchange and open area
are high for light intensity.
