Ecosystem development and mechanism for sustaining biological diversity at lakes in rocky area of Antarctic

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We examined the controlling factors on the development of microbial mat constituted with micro algae, cyanobacteria and moss, on the bottoms of oligotrophic lakes at rocky area of Soya Coast, Antarctic. Nitrogen stable isotope ratios of the mats suggested that nitrogen was supplied through nitrogen fixation by cyanobacteria to the microbial mat communities.Carbon stable isotope ratio of the mats suggested that photosynthetic activity decreased as the amount of light (PAR: Photosynthetically active radiation, UV: Ultra Violet) increased. The amount of both PAR and UV showed negative correlation with the drainage areas, suggesting that the dissolved materials supplied from drainage basin decreased the amount of light.