A comparative analysis of algal assemblages found in Philippine lakes and rivers

Professorial Chair Lecture

Inaugural Professorial Chair Lecture Metro Manila Commission

Place

IBS Main Lecture Hall, College of Arts and Sciences, UPLB, College, Laguna

Date

6-25-1999

Abstract

Algal assemblages in lakes Caliraya, Taal and Laguna de Bay are described along with relevant findings on physico-chemical limnology. Algae in Caliraya Lake represented seven orders with 14 families and a total of 52 genera. A rich community of desmids consisting of Spondylosium, Micrasterias, Mougeotia, Zygnema, Spirogyra, Cosmarium, Staurastrum, Xanthidium, along with the diatoms, Suriella and Synedra are a unique feature of this mesotrophic to eutrophic lake with dystrophic areas around river mouths. Taal lake had a total of 126 species of algae representing the Cyanophyceae, Chlorophyceae, Euglenophyceae, Dinophyceae, Chrysophyceae, and Bacillariophyceae with 63, 40, 4, 3, and 21 genera, respectively. The dominant taxa were Oscillatoria limosa, Eucapsis philippinensis Zafaralla sp. nov. prop., Anabaena variabilis, Pleurocapsa melanospora, and Dactylococcopsis raphidioides. E. philippinensis and D. raphidioides, which were common ten years ago have become scarce with the growth in aquaculture. New entrants, mostly flagellated forms have become proliferant including the dinoflagellate, Ceratium sp. indicative of increasing eutrophication.

The Cyanophyceae, Euglenophyceae, Chlorophyceae, Dinophyceae, Chrysophyceae, and Bacillariophyceae were represented in Laguna de Bay, Putatan area. A total of 48 genera and 58 species were identified representing 10 orders and 25 microfamilies of microalgae. Twenty taxa were under the Cyanophyceae, 21 under the Bacilariophyceae and 14 under the Chlorophyceae. Laguna de Bay is a eutrophic Lake that continuous to be dominated by the blue-green alga, Microcystis aeruginosa. The paper concludes with a four-point agenda for research.

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