Abstract
We compared primary productivity, physical features, and chemical and biological composition of two small lakes possessing different “trophic states” during January, 1970 at Anvers Island, Antarctica. Both lakes, less than 500 meters apart, had partial ice cover the entire season and were underlain with a similar silica-rich granite. Striking dissolved chemical differences were Cl− (7.5 and 35.0), NH +4 −N (0.1 and 2.5), and total PO≡ 4 −P (0.03 and 1.7 mg/l) respectively for lake nos. 1 and 2. Extractable total chlorophyll in subsurface water ranged from 15–41 mg/m2 in lake no. 1 and 35–112 mg/m3 in lake no. 2 during the three week study period. Ranges in net photosynthesis were 0.78–3.5 (Lake no. 1) and 9.0–72.0 mgC/m2/hr (Lake no. 2). Diel ranges for chlorophyll and carbon fixation also fell within these values. We hypothesize that enrichment of lake no. 2 with PO≡ 4 −P and NH +4 −N may account for its higher “trophic state”.
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This research was supported by National Science Foundation grant GA-16768.
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Samsel, G.L., Parker, B.C. Limnological investigations in the area of Anvers Island, Antarctica. Hydrobiologia 40, 505–511 (1972). https://doi.org/10.1007/BF00019985
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DOI: https://doi.org/10.1007/BF00019985