Biological responses to landscape change in the McMurdo Dry Valleys, Antarctica

Summary

Abstract: 

The McMurdo Dry Valleys, Antarctica, are experiencing rapid landscape scale change including increased glacial melt, the expansion of water tracks, thermokarst formation, an increase in the extent of the soil active layer, lake level rise, and altered stream flow. The impacts of these changes for biological communities are currently unknown. The goal of this study was to conduct surveys and experiments in three Dry Valley soil habitats that are expected to undergo change: water tracks, lake margins, and active layer profiles. Specifically, samples were collected from: 1) transects spanning dry-wet-dry soils in two water tracks in different lake basins, including three transects from each of three reaches for each water track, 2) experiments in which water and varying levels of salt were added to dry soils immediately adjacent to water tracks, 3) transects in lake margin soils in two different lake basins, including four transects perpendicular to each lake that span wet-to-dry soils, 4) experiments in which sterilized and non-sterilized lake water were added to dry soils adjacent to lakes, 5) the soil active layer from a total of eight soil pits in two different lake basins that were sampled at 5cm increments of depth, from the surface to 30cm or the permafrost, whichever was encountered first, and 6) experiments in which soils from the bottom of the soil active layer were moved to the upper layer and vice versa. Bacterial communities were sequenced for each sample and edaphic characteristics were measured for a subset of samples.

Date Range: 

Tuesday, December 15, 2015 to Thursday, December 17, 2015

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Variables: 

DATASET_CODE
  • Label: Dataset code
  • Definition: DATASET_CODE
  • Type: Nominal
  • Missing values: None specified
SAMPLE_NUMBER
  • Label: Sample number
  • Definition: SAMPLE_NUMBER
  • Type: Nominal
  • Missing values: None specified
SAMPLING_DATE
  • Label: Sampling date
  • Definition: SAMPLING_DATE
  • Type: Date/time
  • Date format: mm/dd/yy
  • Missing values: None specified
LOCATION
  • Label: Sampling location
  • Definition: UWT = upper reach of the water track; MWT = middle reach of the water track; LWT = lower reach of the water track; LHSS = Lake Hoare South Shore; WHC = Worm Herder Creek
  • Type: Nominal
  • Missing values: None specified
POSITION
  • Label: Sampling position
  • Definition: Sampling position, where Inside = inside of the water track, and Outside = outside of the water track.
  • Type: Nominal
  • Missing values: None specified
DESCRIPTION
  • Label: Sample description
  • Definition: Detailed description of the sample. Upper/Middle/LowerReach = the sampling reach for a given water track; Trans1-Trans3 = transects 1-3 within a given reach; OutL = sample taken from outside of the water track on the left side of the transect while looking downslope; OutR = sample taken from outside of the water track on the right side of the transect while looking downslope; WT1-3 = samples take within the water track from left to right while looking downslope.
  • Type: Nominal
  • Missing values: None specified
TRANSECT_LAT
  • Label: Transect latitude
  • Definition: Latitude of the sampling transect.
  • Type: Nominal
  • Missing values: None specified
TRANSECT_LON
  • Label: Transect longitude
  • Definition: Longitude of the sampling transect.
  • Type: Nominal
  • Missing values: None specified
BACT_FASTQ
  • Label: Bacterial fastq
  • Definition: The url for the bacterial fastq file associated with this sample. See NCBI BioProjectID: PRJNA525069
  • Type: Physical quantity
  • Unit: N/A
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • BLANK = NA
PH
  • Label: pH
  • Definition: pH of a 1:2 soil water extract.
  • Type: Nominal
  • Missing values: None specified
EC
  • Label: Electrical conductivity
  • Definition: Specific electrical conductivity of a 1:5 soil water extract.
  • Type: Physical quantity
  • Unit: microSiemens
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • BLANK = NA
SWC
  • Label: Soil water content
  • Definition: Soil water content determined by drying ~20 grams of soil
  • Type: Physical quantity
  • Unit: percent
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • BLANK = NA
PERCENT_N
  • Label: Percent nitrogen
  • Definition: Percent soil nitrogen as determined by elemental analyses using dried, ground, acidified soils.
  • Type: Physical quantity
  • Unit: percent
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • BLANK = NA
PERCENT_C
  • Label: Percent carbon
  • Definition: Percent soil carbon as determined by elemental analyses using dried, ground, acidified soils.
  • Type: Nominal
  • Missing values: None specified
D13C
  • Label: δ13C
  • Definition: δ13C stable isotope value (expressed as per Mil (‰))
  • Type: Physical quantity
  • Unit: perMil
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • BLANK = NA
CN_RATIO
  • Label: Carbon:Nitrogen
  • Definition: Soil carbon to nitrogen ratio
  • Type: Physical quantity
  • Unit: ratio
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • BLANK = NA

DOI: 

10.6073/pasta/7cbbb5e9182ed1dfae4e89aef6de41c4

Short name: 

SOILS_LANDSCAPE_CHANGE

Data set ID: 

262
Citation
Published in the EDI Data Repository

Citation: 

Van Horn, D. J. 2019. Biological responses to landscape change in the McMurdo Dry Valleys, Antarctica http://dx.doi.org/10.6073/pasta/7cbbb5e9182ed1dfae4e89aef6de41c4
People

Owner/Creator: 

Contact: 

Additional Project roles: 

Data Manager