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Prospects for metazoan life in sub-glacial Antarctic lakes: the most extreme life on Earth?

Prospects for metazoan life in sub-glacial Antarctic lakes: the most extreme life on Earth?
Prospects for metazoan life in sub-glacial Antarctic lakes: the most extreme life on Earth?
About 400 subglacial lakes are known from Antarctica. The question of whether life unique of subglacial lakes exists has been paramount since their discovery. Despite frequent evidence of microbial life mostly from accretion ice, subglacial lakes are characterized by physiologically hostile conditions to metazoan life, as we know it. Pure water (salinity ≤0.4–1.2%), extreme cold (−3°C), high hydrostatic pressure, areas of limited or no oxygen availability and permanent darkness altogether require physiological adaptations to these harsh conditions. The record of gene sequences including some associated with hydrothermal vents does foster the idea of metazoan life in Lake Vostok. Here, we synthesize the physico-chemical environment surrounding sub-glacial lakes and potential sites of hydrothermal activity and advocate that the physico-chemical stability found at these sites may be the most likely sites for metazoan life to exist. The unique conditions presented by Lake Vostok may also offer an outlook on life to be expected in extra-terrestrial subglacial environments, such as on Jupiter's moon Europa or Saturn's moon Enceladus.
1473-5504
1-4
Thatje, Sven
f1011fe3-1048-40c0-97c1-e93b796e6533
Brown, Alastair
a2feb629-7d53-4e89-a1c9-cbee6ac3c09b
Hillenbrand, Claus-dieter
8dc0c76e-e79b-4c8f-90ed-07035aabab98
Thatje, Sven
f1011fe3-1048-40c0-97c1-e93b796e6533
Brown, Alastair
a2feb629-7d53-4e89-a1c9-cbee6ac3c09b
Hillenbrand, Claus-dieter
8dc0c76e-e79b-4c8f-90ed-07035aabab98

Thatje, Sven, Brown, Alastair and Hillenbrand, Claus-dieter (2019) Prospects for metazoan life in sub-glacial Antarctic lakes: the most extreme life on Earth? International Journal of Astrobiology, 1-4. (doi:10.1017/S1473550418000356).

Record type: Article

Abstract

About 400 subglacial lakes are known from Antarctica. The question of whether life unique of subglacial lakes exists has been paramount since their discovery. Despite frequent evidence of microbial life mostly from accretion ice, subglacial lakes are characterized by physiologically hostile conditions to metazoan life, as we know it. Pure water (salinity ≤0.4–1.2%), extreme cold (−3°C), high hydrostatic pressure, areas of limited or no oxygen availability and permanent darkness altogether require physiological adaptations to these harsh conditions. The record of gene sequences including some associated with hydrothermal vents does foster the idea of metazoan life in Lake Vostok. Here, we synthesize the physico-chemical environment surrounding sub-glacial lakes and potential sites of hydrothermal activity and advocate that the physico-chemical stability found at these sites may be the most likely sites for metazoan life to exist. The unique conditions presented by Lake Vostok may also offer an outlook on life to be expected in extra-terrestrial subglacial environments, such as on Jupiter's moon Europa or Saturn's moon Enceladus.

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e-pub ahead of print date: 15 January 2019

Identifiers

Local EPrints ID: 430141
URI: http://eprints.soton.ac.uk/id/eprint/430141
ISSN: 1473-5504
PURE UUID: 3530890e-eddb-4373-984e-66665d7a2a6b

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Date deposited: 12 Apr 2019 16:30
Last modified: 29 Jan 2020 17:38

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