Physicochemical and biological features of Laguna de Bay waters in the vicinity of a water treatment facility, Putatan, Muntinlupa City.

Date

4-2000

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Macrina T. Zafaralla

Abstract

The waters of Laguna de Bay in the vicinity of a water treatment facility located in Putatan, Muntinlupa City were studied within a 16-month period (July 1998 — October 1999). The physicochemical parameters investigated were: water temperature and transparency, specific conductance, salinity, pH, dissolved oxygen, alkalinity, hardness, orthophosphate and total phosphorus. The biological parameters were: biomass, species composition and total algal density. The similarity index among the three stations was $10 computed. Laguna de Bay waters in Putatan had a narrow temperature range of 27.6°C to 32.6°C, diminishing in December to March. Relatively cooler waters developed in December were accompanied by an improved water transparency. The latter, however, was below the standard at less than 0.5 m. The density of algae in the area, accounted for primarily by Microcystis aeruginosa, played a key role in water transparency changes even though the area was generally colored brownish-grey due to suspended silt. Laguna de Bay waters meet the water quality standard of pH for Class C waters with its mean pH of 6.74. Fluctuations displayed by this parameter could be related to organic degradation in the area. Adequacy in the supply of nutrients was indicated and supported by ortho-P and alkalinity levels. Algal biomass measurements based on chlorophyll a reiterate the eutrophic state of the lake. Net primary productivity values concurred with the indications of biomass regarding the lake's trophic status. A total of 75 species under 65 genera were collected. Out of these, 12 species occurred in all three stations. The perennially occurring species M. aeruginos' dominated the phytoplankton communities that developed during each sampling date. The similarity index indicated that in general, stations 1 and 2 bore more biologi similarities with each other than with station 3.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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