Biogeography of Bacterioplankton in Lakes and Streams of an Arctic Tundra Catchment

Bacterioplankton community composition was compared across 10 lakes and 14 streams within the catchment of Toolik Lake, a tundra lake in Arctic Alaska, during seven surveys conducted over three years using denaturing gradient gel electrophoresis (DGGE) of PCR-amplified rDNA. Bacterioplankton communi...

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Bibliographic Details
Published in:Ecology (Durham) 2007-06, Vol.88 (6), p.1365-1378
Main Authors: Crump, Byron C., Adams, Heather E., Hobbie, John E., Kling, George W.
Format: Article
Language:English
Subjects:
Arctic
Arctic Regions
Bacteria
Bacteria - classification
Bacteria - genetics
Bacteria - growth & development
bacterial production
Bacterioplankton
Biodiversity
biogeography
Communities
Creeks & streams
denaturing gradient gel electrophoresis
DGGE
diversity
DNA, Bacterial - analysis
DNA, Ribosomal Spacer
Ecology
Ecosystem
Electrophoresis, Polyacrylamide Gel
Fresh Water - microbiology
Freshwater
Headwaters
Inlets
Lakes
Limnology
metacommunity
Plankton
Plankton - classification
Plankton - genetics
Plankton - growth & development
Polymerase Chain Reaction
Population Dynamics
Rivers - microbiology
Special Feature: New Directions in Microbial Ecology
Streams
Sustainable communities
Trees
Water Microbiology
Water Movements
Watersheds
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Summary:Bacterioplankton community composition was compared across 10 lakes and 14 streams within the catchment of Toolik Lake, a tundra lake in Arctic Alaska, during seven surveys conducted over three years using denaturing gradient gel electrophoresis (DGGE) of PCR-amplified rDNA. Bacterioplankton communities in streams draining tundra were very different than those in streams draining lakes. Communities in streams draining lakes were similar to communities in lakes. In a connected series of lakes and streams, the stream communities changed with distance from the upstream lake and with changes in water chemistry, suggesting inoculation and dilution with bacteria from soil waters or hyporheic zones. In the same system, lakes shared similar bacterioplankton communities (78% similar) that shifted gradually down the catchment. In contrast, unconnected lakes contained somewhat different communities (67% similar). We found evidence that dispersal influences bacterioplankton communities via advection and dilution (mass effects) in streams, and via inoculation and subsequent growth in lakes. The spatial pattern of bacterioplankton community composition was strongly influenced by interactions among soil water, stream, and lake environments. Our results reveal large differences in lake-specific and stream-specific bacterial community composition over restricted spatial scales (
ISSN:0012-9658
1939-9170
DOI:10.1890/06-0387