Species Diversity of Benthic Water Phytoplankton and Relationships Between Benthic Water Qualities at Mud Flat Area of Laem Phak Bia, Laem Phak Bia Sub District, Ban LaemDistrict, Phetchaburi Province

Abstract

Study on species diversity of benthic water phytoplankton and relationships between benthic water qualities at mud flat area of Laem Phak Bia of Laem Phak Bia, Laem Phak Bia Sub District, Ban Laem District, Phetchaburi Province. The samples were collected from underground at the depth of 30 cm during rainy period (September-2012) and summer period (March-2013). The results showed that benthic water phytoplankton was found in 21 genera of 2 Division, 3 genera in Cyanophyta and 18 genera in Chromophyta. The dominant species belong to species Coscinodiscus sp. and Oscillatoria sp. The index of evenness index and species diversity of benthic water phytoplankton were 0.76 and 2.17, respectively. The observed indices related to benthic water phytoplankton exhibited significant positive correlations with that dissolved oxygen, TKN, orthophosphate  and hydrogen sulfide (p<0.05), whilst they showed significant negative correlations with that salinity of the water (p<0.05).