Limnology and ecology of lakes along the S?ya Coast, East Antarctica  

作　　者：Sakae Kudoh Yukiko Tanabe 

机构地区：[1]National Institute of Polar Research, 10-3 Midori-cho,Tachikawa, Tokyo 190-8518, Japan [2]Department of Polar Science, The Graduate University for Advanced Studies (Sokendai), 10-3 Midori-cho,Tachikawa, Tokyo 190-8518, Japan [3]Waseda Institute for Advanced Study, Waseda University, 1-6-1 Nishi Waseda,Shinjuku, Tokyo 169-8050, Japan

出　　处：《Advances in Polar Science》2014年第2期75-91,共17页极地科学进展（英文版）

基　　金：partly supported by a grant from the Center for the Promotion of Integrated Sciences,the Graduate University for Advanced Studies(SOKENDAI),Japan and an NIPR publication subsidy

摘　　要：The Soya Coast in East Antarctica has several ice-free areas where many small （〈1 km2） and shallow （〈50 m depth） glacial lakes display various limnological features. Geological, biological, and ecological studies conducted by the Japanese Antarctic Research Expeditions since 1957 are reviewed herein. Most of the lakes along the coast are oligotrophic; however, water quality is highly variable depending on differences in lake morphology and history. Geophysical and paleolimnological studies suggest that most of the lakes appeared after the Last Glacial Maximum （LGM） and have since maintained a lacustrine condition. The ubiquitous occurrence of benthic microbial assemblages with low phytoplankton biomasses is a common feature of other Antarctic lakes. However, diverse benthic assemblages such as moss pillars and large pinnacle microbial structures are found in the lake basins. Frequent and continuous limnological studies have revealed three typical water circulation patterns, underwater light climate features （too much light, which includes UV radiation during the ice free season）, and the structure of benthic assemblages based on their photosynthetic physiology. The phenomenon of mass floatation of benthic assemblages was observed in a lake during the ice-covered season; this was explained by seasonal environmental conditions. Thus, a hypothesis was formulated based on ecological matter cycling, eutrophication, and lake succession processes.The Soya Coast in East Antarctica has several ice-free areas where many small （〈1 km2） and shallow （〈50 m depth） glacial lakes display various limnological features. Geological, biological, and ecological studies conducted by the Japanese Antarctic Research Expeditions since 1957 are reviewed herein. Most of the lakes along the coast are oligotrophic; however, water quality is highly variable depending on differences in lake morphology and history. Geophysical and paleolimnological studies suggest that most of the lakes appeared after the Last Glacial Maximum （LGM） and have since maintained a lacustrine condition. The ubiquitous occurrence of benthic microbial assemblages with low phytoplankton biomasses is a common feature of other Antarctic lakes. However, diverse benthic assemblages such as moss pillars and large pinnacle microbial structures are found in the lake basins. Frequent and continuous limnological studies have revealed three typical water circulation patterns, underwater light climate features （too much light, which includes UV radiation during the ice free season）, and the structure of benthic assemblages based on their photosynthetic physiology. The phenomenon of mass floatation of benthic assemblages was observed in a lake during the ice-covered season; this was explained by seasonal environmental conditions. Thus, a hypothesis was formulated based on ecological matter cycling, eutrophication, and lake succession processes.

关 键 词：glacial lakes biological diversity PHYTOBENTHOS polar ecosystem photophysiology circulation patterns 

分 类 号：P343.3[天文地球—水文科学]