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GEOPHYSICAL RESEARCH LETTERS,
VOL. 33,
L07406,
4 PP., 2006
doi:10.1029/2006GL025903
Antarctic climate cooling and response of diatoms in glacial meltwater streams
Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado, USA
Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado, USA
Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado, USA
Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado, USA
Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado, USA
Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado, USA
Department of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago, Illinois, USA
Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado, USA
To understand biotic responses to an Antarctic cooling trend, we analyzed diatom samples from glacial meltwater streams in the McMurdo Dry Valleys, the largest ice-free area in Antarctica. Diatoms are abundant in these streams, and 24 of 40 species have only been found in the Antarctic. The percentage of these Antarctic diatom species increased with decreasing annual stream flow and increasing harshness of the stream habitat. The species diversity of assemblages reached a maximum when the Antarctic species accounted for 40–60% of relative diatom abundance. Decreased solar radiation and air-temperatures reduce annual stream flow, raising the dominance of these Antarctic species to levels above 60%. Thus, cooling favors the Antarctic species, and lowers diatom species diversity in this region.
Received 30 January 2006; accepted 3 March 2006; published 15 April 2006.
Citation: (2006), Antarctic climate cooling and response of diatoms in glacial meltwater streams, Geophys. Res. Lett., 33, L07406, doi:10.1029/2006GL025903.
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