Phytoplankton Abundance and Distribution in Selected Sites of Boracay Island, Malay, Aklan, Central Philippines

Abstract

This study a investigated the impacts of natural and anthropogenic factors on the coastal water quality dynamics in the Island of Boracay, Malay, Aklan, Central Philippines particularly the effects of nutrient pollution of phytoplankton population. The samples were gathered at two month interval for a total of five samplings by filtering 10 liter buckets of surface water through a net with 25um mesh bag. There were 35 identified genera of phytoplankton belonging to four taxonomic groups. Diatoms had 26 genera, cyanophycean and silicoflagellate and dinoflagellates had one and seven genera, respectively. Diatoms were the dominant group with the highest mean density of 1,588 and L-1, followed by silicoflagellate at 399 ind. L-1 represented by Tintinnopsis, cynophycean was represented by Trichodesmium at 204 ind.L-1, while the dinoflagellates had 132 ind.L-1. Genera richness was high when N and P concentrations were relatively lower. Phytoplankton density was highest in Lugotan Cove and Long Beach were nutrients readings were relatively high. This research clearly demonstrated that the growth of Trichodesmium reaching carrying capacity is an indication that the island ecosystem is near its ecological threshold. The level of nitrate N acts as the limiting nutrient in the coastal water of the island controlling the growth of Trichodesmium and phytoplankton diversity. Changes in phytoplankton assemblages and density in the coastal waters were associated to variations on intensity and frequency of water mixing along with nutrient loading coming from anthropogenic activities and land uses in the island.

Source or Periodical Title

Journal of Environmental Science and Management

ISSN

0119-1144

Page

1-14

Document Type

Article

Frequency

irregularly

Physical Description

tables, map, graphs

Language

English

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