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Antarctic lake phytoplankton and bacteria from near‐surface waters exhibit high sensitivity to climate‐driven disturbance

Journal Article · · Environmental Microbiology
 [1];  [1];  [2];  [3];  [4];  [1]
  1. Department of Microbiology Miami University Oxford Ohio USA
  2. Lawrence Livermore National Laboratory Livermore California USA
  3. Institute of Arctic and Alpine Research University of Colorado Boulder Colorado USA
  4. Polar Oceans Research Group Sheridan Montana USA

Abstract

The McMurdo Dry Valleys (MDVs), Antarctica, represent a cold, desert ecosystem poised on the threshold of melting and freezing water. The MDVs have experienced dramatic signs of climatic change, most notably a warm austral summer in 2001–2002 that caused widespread flooding, partial ice cover loss and lake level rise. To understand the impact of these climatic disturbances on lake microbial communities, we simulated lake level rise and ice‐cover loss by transplanting dialysis‐bagged communities from selected depths to other locations in the water column or to an open water perimeter moat. Bacteria and eukaryote communities residing in the surface waters (5 m) exhibited shifts in community composition when exposed to either disturbance, while microbial communities from below the surface were largely unaffected by the transplant. We also observed an accumulation of labile dissolved organic carbon in the transplanted surface communities. In addition, there were taxa‐specific sensitivities: cryptophytes and Actinobacteria were highly sensitive particularly to the moat transplant, while chlorophytes and several bacterial taxa increased in relative abundance or were unaffected. Our results reveal that future climate‐driven disturbances will likely undermine the stability and productivity of MDV lake phytoplankton and bacterial communities in the surface waters of this extreme environment.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1877438
Alternate ID(s):
OSTI ID: 2371794
OSTI ID: 1877441
Journal Information:
Environmental Microbiology, Journal Name: Environmental Microbiology Journal Issue: 12 Vol. 24; ISSN 1462-2912
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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