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Benthic Microbial Mats ice-covered Antarctic lakes

Vopel_ant_MP4

Complete microprofiles under extreme conditions

The Unisense MiniProfiler was deployed into two perennially ice-covered lakes of McMurdo Dry Valleys in Antarctica to study their laminated photosynthetic microbial communities. Temperature above the ice was approximately -15oC and below the ice around 0oC. The researchers drilled holes into the ice covers to lower the MiniProfiler into the lakes. The deployment of the MiniProfiler at the lake floors and away from the ice holes were guided by a tethered diver.

The laminations of the microbial communities represent annual growth accumulations. The ice on the lakes was several meters thick and its optical properties may influence the carbon fixation rates and thus the lamination thickness. The researchers studied this by doing simultaneous measurements of dissolved oxygen in the diffusive boundary layers above the mats, chlorophyll fluorescence, and downwelling irradiance of photosynthetically active radiation.

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Vopel,K. et al (2006), Photosynthetic performance of benthic microbial mats in Lake Hoare, Antarctica, Limnol Oceanography, 1801 - 1812, vol. 51 Read abstract

Borum,J. et al (2005), The potential role of plant oxygen and sulphide dynamics in die-off events of the tropical seagrass, Thalassia testudinum, Journal of Ecology, 148 - 158, vol. 93 Read abstract

Koschorreck,M. et al (2007), Effects of benthic filamentous algae on the sediment water interface in an acidic mining lake, Hydrobiologia, 387 - 397, vol. 592 Read abstract

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