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- Title
Phytoplankton Community Dynamics in Tadlac Lake, Los Baños, Laguna, Philippines.
- Authors
Soltura Villaruel, Mc Jervis; Dela Cruz Camacho, Maria Vivian
- Abstract
Tadlac Lake was heavily used for aquaculture until a massive fish kill occurred in the lake from December 1999 to February 2000 during its annual overturn. Subsequently, aquaculture activity was prohibited in the lake to improve its water quality. In this study, we assessed the trophic status of Tadlac Lake by characterizing the phytoplankton community and environmental variables collected from October 2017 to March 2018 to evaluate the effectiveness of the rehabilitation strategy. A total of 14 phytoplankton species were present in the seven stations sampled throughout the study period. Chlorophyta had the highest relative density (RD) (71.42 %), followed by Bacillariophyta (32.37 %) and Cyanophyta (8.57 %). Among phytoplankton taxa, Aulacoseira granulata had the highest density, followed by Coelastrum microporum and Eudorina elegans. Significant variation in phytoplankton density was documented among sampling months (p<0.05), but not among sampling sites (p>0.05). Differences in the phytoplankton density across sampling months were also supported by cluster analysis and analysis of similarities. Similarity percentage showed that the difference in plankton density could mainly be attributed to the density of the most abundant taxa. Canonical correspondence analysis revealed that phytoplankton communities in the lake were highly influenced by nitrate, phosphate, pH, temperature, and conductivity. Tadlac Lake is still in eutrophic condition based on the dominant phytoplankton species, high concentration of nitrate and phosphate, and calculated biotic indices. Therefore, further strategies are needed to more effectively control nutrient enrichment and restore the ecosystem of Tadlac Lake.
- Subjects
PHILIPPINES; PHYTOPLANKTON; WATER quality; FISH kills; SPECIFIC gravity; LAKES; AQUACULTURE industry
- Publication
Journal of Fisheries & Environment, 2022, Vol 46, Issue 3, p55
- ISSN
2630-0702
- Publication type
Article