Changes in the species richness, species diversity and percent similarity of phytoplankton communities in Taal Lake, Philippines with and without the occurrence of seismicity and low-intensity volcanism
2006
Zafaralla, M.T. | Pham, A. | Inamori, Y.
A study was done in Taal Lake from September 2004 to June 2005 to determine species richness, algal density, species diversity, and percent similarity of different parts of the year characterized by varied amounts of rainfall received, and by the levels of seismicity and/or volcanic activity that occurred. Spatial variations were determined from five monitoring stations. Information on seismic disturbances/volcanic unrest was taken from a report of the Philippine Institute of Volcanology and Seismology (PHILVOLCS). Net samples of algae revealed a total of 28 algal species (25 genera) of which 13 were Cyanophyceae, 10 Chlorophyceae, 1 Dinophyceae, and 4 Bacillariophyceae. Resumption of volcanic activity on September coincided with a low species richness. The seismicity-and volcanism - disturbed month of November indicated increments that reached a peak in the non-seismicity month of December. Four out of five stations had roughly the same amount of percent contribution to the total species richness of the lake. Percent similarity (PS) was substantial between September and April (PS 41.2%), and September and June (PS
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