1. Temporal and spatial variation in planktonic abundance, biomass and composition were determined in Lake Hoare (McMurdo Dry Valleys, Antarctica) over two summer seasons (1996–97 and 1997–98). 2. Phototrophic nanoflagellates (PNAN) dominated planktonic biomass, with a mean monthly biomass ranging between 27.3 and 40.4 lg C L. The deep chlorophyll maximum was mainly composed of cryptophytes (>8...

Lake Bonney is a chemically stratified, permanently ice-covered Antarctic lake that is unusual because anomalous nutrient concentrations in the east lobe suggest that denitrification occurs in the deep suboxic waters of the west lobe but not the east lobe, resulting in high concentrations of nitrate and nitrite below the east lobe chemocline. Environmental factors that usually control denitrifi...

Abstract. Plastics have been found in several compartments Antarctica. However, there is currently no evidence of their presence on Antarctic glaciers. Our pilot study investigated plastic occurrence two ice surfaces (one area around Uruguay Lake and another one Ionosferico Lake) that constitute part the ablation zone Collins Glacier (King George Island, Antarctica). results showed expanded pol...