Biodiversity of blue-green algae in rice paddies in Mae Rim district, Chiang Mai province
2002
Chainapong, T.(Chiang Mai University, Chiang Mai (Thailand). Faculty of Science. Department of Biology) | Traichaiyaporn, S.(Chiang Mai University, Chiang Mai (Thailand). Faculty of Science. Department of Biology)
Species diversity of blue-green algae in rice paddies in Mae Rim District, Chiang Mai Province, was studied. Samples of phytoplankton, benthic algae and soil algae were collected. Sixty-six species belonging to 3 orders, 6 families and 20 genera were collected, including Aphanocapsa spp., Chroococcus spp., Eucapsis sp., Gloeothece sp., Merismopedia spp., Lyngbya spp., Oscillatoria spp., Phormidium sp., Pseudanabaena spp., Spirulina spp., Anabaena spp., Cylindrospermopsis sp., Cylindrospermum spp., Raphidiopsis sp., Nostoc spp., Scytonema spp., Calothrix spp., Gleotrichia spp., Hapalosiphon sp. and Stigonema sp. The phytoplankton community included 37 species belonging to 2 orders, 4 families and 15 genera. The predominant genera were Aphanocapsa, Oscillatoria and Anabaena. The mean density of phytoplankton was 4.318-44,417.5*10**(3) unit/l. The benthic algae community included 45 species belonging to 3 orders, 6 families and 15 genera. The predominant genera were Aphanocapsa, Oscillatoria, Anabaena and Cylindrospermum. The soil algae community included 29 species belonging to 2 orders, 4 families and 8 genera. The predominant genera were Anabaena and Nostoc. Abundant genera included Cylindrospermum, Scytonema, Calothrix and Hapalosiphon. The mean density of soil algae was 2.51-20.59*10**(5) cell/g dry soil. The main factors affecting the succession of blue-green algae included temperature, alkalinity, light intensity, soil moisture, pH and nutrient concentration.
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