Abstract:
Periphyton is a type of algae that commonly inhabit the surface of any immersed
objects. A research aims to understand types and abundant of periphyton in the Koto
Panjang Dam has been conducted in Oktober to November 2012. Sampling were conducted
3 times, once/week, at 4 stations, namely St I, (riverine), St II (transitions) and St III
(lakustrine) and St IV (lacustrine). Periphyton samples were taken by scraping the surface
of the immersed wood using a tooth brush ( 5x5 cm2 ). Periphyton collected were then
preserved using lugol 1% and then identified based on Hiroyuki et al., (1977) and Yunfang
(1995).
Result shown that the periphyton obtained were consisted of 38 species, they are
belonged to 4 classes, namely Cyanophyceae (12 species), Chlorophyceae (12 species),
Bacillariophyceae (11 species) dan Xanthophyceae (3 species). The most common
periphyton in each sampling site was Rivularia globiceps. Based on periphyton abundance
(21,775 - 42,792 cell/cm2), the Koto Panjang dam can be categorized as eutrophic . In
general, the H’ was 1,96 - 2,23; E was 0.82 - 0.89 and C was 0.13 - 0.20. Water quality in
the the dam was good, as the temperature was 25-35 0C; brightness was 26.5-118.5 cm,
current speed was 0.01-0.29 m/sec, pH was 6, free Carbon Dioxide was 2.11-10.56 mg/l,
nitrate was 0.02-0.08 mg/l and Phosphate was 0.02-0.05 mg/l. Based on data obtained, it
can be concluded that the periphyton in the dam is growing well and the water quality is
suitable for the life of that organism.
