年間 4 号発行
ISSN 印刷: 1521-9429
ISSN オンライン: 1940-4328
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Distribution of Phytoplankton and Periphyton in the Shallow Rice-Fish Fields of Arunachal Pradesh, India
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要約
Rice is a staple food for billions of people worldwide, and rice fields are an ecologically important area of research. Rice fields with a shallow water level are ecologically distinct to deepwater rice fields. A survey of algae associated with the rice-fish field of the Apatani plateau in Arunachal Pradesh, India, was conducted to demonstrate the beneficial effects of algal biomass on fish and rice cultivation simultaneously. Qualitative and quantitative data from different water logging phases of the field indicated a gradual increase in population diversity and composition as the season progressed. The plankton abundance varied from 2575 to 6268 units/lt in the early flood, flood and post-flood periods of the studied area. For periphyton, abundance varied from ~ 2406 to 36513 unit/cm2/stem. The most dominant genus among Chlorophyta group encountered were Xanthidium, Selenestrum, Spirogyra, Scenedesmus, Pleurotaenium, Pediastrum, Oedogonium, Euglena, Euastrum, Desmidium, Cosmarium, Closterium, Chlorogonum, Chlorococcum, Chlorella in the early flood and flood period. Blue-green algae and diatom species were found to be more dominant when compared to Chlorophyta, in the warm season i.e moderate temperature. Extreme temperatures (cold or hot) supported green algae growth. Among the diatoms, the most common genera found were Navicula sp. and Pinnularia. The dominant blue-green algae found were Anabaena sp., Anabaena spiroides, Anabaenopsis sp., Chroococcus minutus, Chroococcus turgidus, and Cylindrospermum indicum at the start of the winter period. In total, 25 genera of blue green algae, 99 genera of green algae, and 10 species of Bacillariophyceae were encountered. The physico-chemical properties of soil and water were conducive for rice-fish farming.
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