Vertical Profile of Phytoplankton Abundance in Tanjung Putus Oxbow Lake Buluh Cina Village Siak Hulu Sub District Kampar District Riau Province
Abstract
This research was conducted in February 2013 at Tanjung Putus Oxbow Lake.Phytoplankton samples were collected from 3 stations. In each station, there were 2sampling sites, in the surface and in 2.5 Secchi depth. Sampling was done three times,once a week. Objective of this research was to find-out the vertical profiles ofphytoplankton abundance in Tanjung Putus Oxbow Lake. Results of this researchrevealed 47 species of phytoplankton were classified into 5 classes, namely, Chlorophyceae(14 species), Cyanophyceae (6 species), Bacillariophyceae (10 species), Chrysophyceae (1species), and Xanthophyceae (5 species). The phytoplankton abundance at surface rangedfrom 221634-361213 cells/l and in 2.5 Secchi depth ranged from 135814-216923 cells/l. Thevertical profile of phytoplankton abundance was higher in surface than that in 2.5 Secchidepth. The water quality parameters such as water temperature ranged from 30-31oC,transparancy from 89-92.3 cm, depth from 141.7-301.7 m, pH 5.0, dissolved oxygen from3.50-6,17 mg / l, free carbon dioxide from 7.76-15.7 mg / l, nitrate from 0.02-0.1 mg / l, andphosphate ranged from 0.020-0.1 mg / l. Based on phytoplankton abundance, Tanjung PutusOxbow Lake was categorized mesotrophy.
Key words : Phytoplankton, the vertical profiles, Tanjung Putus Oxbow Lake
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