Biomass, stoichiometry, and isotopic signatures of stream microbial mats, McMurdo Dry Valleys, Antarctica (2012-2013)

Summary

Abstract: 

We conducted a field survey to quantify the biomass (chlorophyll-a and ash-free dry mass), nutrient ratios (molar C:N:P), and isotopic signatures (δ13C and δ15N) of four microbial mat types (green, orange, black, and red) in the glacial meltwater streams of the McMurdo Dry Valleys, Antarctica. All samples were taken from late December to late January during the 2011-2012 and 2012-2013 austral summers, and included sites from Taylor, Miers, Garwood, and Wright valleys. Most collection sites were located at the lake outlet of streams, but for a subset (e.g. Delta, Von Guerard, Onyx, Miers, and Canada) more than one sample site is included per stream system.

Date Range: 

January 10, 2012 to January 23, 2013
Data Citation
Kohler, T.J., Mcknight, D.M. 2023. Biomass, stoichiometry, and isotopic signatures of stream microbial mats, McMurdo Dry Valleys, Antarctica (2012-2013). Environmental Data Initiative. DOI: 10.6073/pasta/b217f5f36d18d149a8f52f17a7823f1d. Dataset accessed 16 June 2024.
Dataset(s)

Description: 

Biomass, nutrient ratios, and isotopic signatures of stream microbial mats.

Variables (click to expand): 

dataset_code
  • Label: Dataset Code
  • Definition: Internal dataset code.
  • Type: Nominal
  • Missing values: None specified
strmtrnsid
  • Label: Stream Transect ID
  • Definition: MCM LTER stream algal transect ID.
  • Type: Nominal
  • Missing values: None specified
stream_name
  • Label: Stream Name
  • Definition: Name of the stream where sample(s) were collected.
  • Type: Nominal
  • Missing values: None specified
valley
  • Label: Valley Name
  • Definition: Name of the valley where sample(s) were collected within the McMurdo Dry Valleys region of Antarctica.
  • Type: Nominal
  • Missing values: None specified
outlet
  • Label: Outlet
  • Definition: Outlet of the stream associated with the sample.
  • Type: Nominal
  • Missing values: None specified
latitude
  • Label: Latitude
  • Definition: Stream algal transect latitude.
  • Type: Physical quantity
  • Unit: decimalDegrees
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
longitude
  • Label: Longitude
  • Definition: Stream algal transect longitude.
  • Type: Physical quantity
  • Unit: decimalDegrees
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
mat_type
  • Label: Mat Type
  • Definition: Type of microbial mat sampled (i.e., black, orange, red, or green).
  • Type: Nominal
  • Missing values: None specified
replicate
  • Label: Replicate ID
  • Definition: Replicate number or identifier associated with the sample collection. In cases where the sample also exists in the microbial biomass core dataset (see provenance notes), this column corresponds with the sample name.
  • Type: Nominal
  • Missing values: None specified
date_sampled
  • Label: Date sampled
  • Definition: Date sample(s) were collected.
  • Type: Date/time
  • Date format: YYYY-MM-DD
  • Missing values: None specified
season
  • Label: Field Season
  • Definition: January-year in which the samples were taken.
  • Type: Nominal
  • Missing values: None specified
dist_transect
  • Label: Transect Distance
  • Definition: Distance from stream algal transect to its source glacier (for samples collected within Taylor Valley only).
  • Type: Physical quantity
  • Unit: kilometer
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
dist_coast
  • Label: Coast Distance
  • Definition: Distance from stream algal transect to the coast of the Ross Sea (for samples collected within Taylor Valley only).
  • Type: Physical quantity
  • Unit: kilometer
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
d13c_permil
  • Label: d13C
  • Definition: Measure of the ratio of 13C:12C in standard delta notation, expressed relative to universal isotope standards (Pee Dee Belemnite) in parts per thousand (per mil).
  • Type: Physical quantity
  • Unit: perMil
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
d15n_permil
  • Label: d15N
  • Definition: Measure of the ratio of 15N:14N in standard delta notation, expressed relative to universal isotope standards (atmospheric N2) in parts per thousand (per mil). Un-acidified aliquot used.
  • Type: Physical quantity
  • Unit: perMil
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
cn_ratio
  • Label: C:N
  • Definition: Molar ratio of carbon to nitrogen.
  • Type: Nominal
  • Missing values: None specified
cp_ratio
  • Label: C:P
  • Definition: Molar ratio of carbon to phosphorus.
  • Type: Nominal
  • Missing values: None specified
np_ratio
  • Label: N:P
  • Definition: Molar ratio of nitrogen to phosphorus.
  • Type: Nominal
  • Missing values: None specified
afdm_mg_cm2
  • Label: Ash-free Dry Mass
  • Definition: The mass of mat sample lost following ignition per unit area.
  • Type: Physical quantity
  • Unit: milligramsPerCentimeterSquared
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
chla_ug_cm2
  • Label: Chlorophyll-a
  • Definition: Quantity of measured chlorophyll-a pigment per unit area.
  • Type: Physical quantity
  • Unit: microgramsPerCentimeterSquared
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
ai_ratio
  • Label: Autotrophic Index
  • Definition: The ratio of chlorophyll-a to AFDM.
  • Type: Nominal
  • Missing values: None specified
din_ug_l
  • Label: Dissolved Inorganic Nitrogen
  • Definition: Average dissolved inorganic nitrogen (see methods for more details).
  • Type: Physical quantity
  • Unit: microgramsPerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
srp_ug_l
  • Label: Soluble Reactive Phosphorus
  • Definition: Average soluble reactive phosphorus (see methods for more details).
  • Type: Physical quantity
  • Unit: microgramsPerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified

Short name: 

STRM_MAT_ISOTOPES

Dataset ID: 

9039
People

Principal Investigator(s): 

Contact: 

Associated Personnel: 

Data Manager