AN ASSESSMENT OF THE BENTHIC COMMUNITY STRUCTURE IMPLICATIONS ON

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An Assessment of the Benthic Community Structure: Implications on the Water Quality of Lake Palacpaquen, San Pablo City, Philippines




An Assessment of the Benthic Community Structure: Implications on the Water Quality of Lake Palacpaquen, San Pablo City, Philippines


Perez, T, Caasi, H., and de la Torre, J.

Department of Environmental Science, Ateneo de Manila University,

Loyola Heights, Quezon City, Philippines



Lake Palacpaquen is the shallowest and second largest lake in the Seven Lakes of San Pablo City, Laguna, Philippines. The lake is threatened by water quality deterioration caused by anthropogenic activities. The benthic macroinvertebrate community of the lake was investigated. The impact of water quality deterioration on the benthic community was evaluated using the Belgian Biotic Index (BBI) and the Family-Level Biotic Index (FBI). Samples were obtained from four stations in the lake: inlet, pool, periphery and outlet and in-situ water quality parameters were measured. Substrate varied from organic litter (leaves, twigs, roots) to gravel and fine sediments. DO concentrations and turbidity were generally lower in November while pH level, temperature and conductivity were lower in December, following a series of heavy rainfall.

Dominance of mollusca genera Melanoides, Tarebia, Bellamya and Angulyagra were observed to dominate. Six other genera of mollusks were found, including the bivalve Corbicula and the foreign species, Pomacea canaliculata. Larvae of the Family Chironomidae were abundant in the pool.

Taxa diversity was highest in the periphery and the lake outlet in December and January. Diversity of the entire lake obtained from composite samples was highest in January (H’= 0.834). BBI scores were lowest in November and highest in January for all sites. Based on the BBI, Lake Palacpaquen was moderately polluted in November and December, and was lightly polluted to unpolluted in January. FBI scores were lowest in January (6 = fairly poor), but this rating is still indicative of the possibility of substantial pollution.



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Tags: assessment of, structure, implications, benthic, assessment, community