Study on water quality and phytoplankton community in Kung Krabaen bay, Eastern Thailand
1997
Siri Tookwinas | Chanin Sangrungruang | Youngyut Predalumpaburt (Department of Fisheries, Bangkok (Thailand))
Kung Krabaen Bay is fringed inwardly by mangrove forest, which is about 500-800 m wide landward to seaward. An intensive marine shrimp farming area is located around the bay behind the mangrove area with a total pond area of 160 ha. Intensive marine shrimp farming has been practiced in this area since 1987. The aquatic environmental quality in the bay has been monitored to assess the impact of shrimp farming on the coastal environment. The water quality and phytoplankton in Kung Krabaen Bay were monitored every month in 1994. Soluble reactive phosphorus, dissolved oxygen, ammonia-nitrogen, nitrite-nitrogen, nitrate-nitrogen, pH, salinity, silicate and transparency were significantly different among the surveyed stations (P0.05). Most of the water quality parameters were significantly different during the monthly survey period (P0.05). The linkage between the phytoplankton community and monthly average water quality was analysed using multivariate analysis (BIOENV program). The phytoplankton community was influenced by the water quality at maximum harmonic rank correlation (HRC) of 0.312 by nitrite, of 0.150 by ammonia-nitrogen, of 0.315 by the combination of nitrite-nitrogen and salinity and by 0.274 for the combination of salinity and silicate. The stress of non-metric multidimensional scaling (MDS) was 0.100.
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