Microbial mat biomass, isotopes, and nutrient ratios sampled over a longitudinal gradient of two McMurdo Dry Valley streams

Summary

Abstract: 

We performed a field survey to assess changes in biomass, nutrient ratios, and isotopic signatures of three different microbial mat types in two glacial meltwater streams in the McMurdo Dry Valleys, Antarctica. Samples were taken in January 2013 from pre-existing transects over Von Guerard Stream and the Relict Channel, and stretched from near the Von Guerard Glacier terminus to the stream outlets at Lake Fryxell. In addition to the three microbial mat types, which included Nostoc (black), Chlorophyte (green), and Oscillatorean (orange) mats, particulate organic matter (POM) was collected from Von Guerard Stream in January 2008 over a full diel cycle in order to determine the origin of material in transport by comparing its elemental and isotopic characteristics with stream mats.

Date Range: 

Wednesday, December 19, 2007 to Sunday, January 20, 2013

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Variables: 

DATASET_CODE
  • Label: Dataset code
  • Definition: DATASET_CODE
  • Type: Nominal
  • Missing values: None specified
STREAM
  • Label: Stream
  • Definition: Stream name in the Lake Fryxell Basin, Taylor Valley, Antarctica.
  • Type: Nominal
  • Missing values: None specified
DATE_SAMPLED
  • Label: Date sampled
  • Definition: Date samples were collected.
  • Type: Date/time
  • Date format: MM/DD/YYYY
  • Missing values: None specified
TIME_SAMPLED
  • Label: Time sampled
  • Definition: Time a sample was taken (for POM only). Expressed in NZST (daylight savings time is observed).
  • Type: Date/time
  • Date format: HHMM
  • Missing values:
    • BLANK = No data
TRANSECT
  • Label: Transect
  • Definition: The established MCM LTER transect that samples were taken from.
  • Type: Nominal
  • Missing values: None specified
SAMPLE_TYPE
  • Label: Sample type
  • Definition: Type of sample. Includes the three mat types (i.e., black, green, orange) as well as POM (particulate organic matter).
  • Type: Nominal
  • Missing values: None specified
DISTANCE
  • Label: Distance
  • Definition: Distance of a given transect from the Von Guerard Glacier as estimated using Google Earth.
  • Type: Physical quantity
  • Unit: kilometer
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
D13C
  • 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:
    • BLANK = No data
D15N
  • 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).
  • Type: Physical quantity
  • Unit: perMil
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • BLANK = No data
CN
  • Label: C:N
  • Definition: Molar ratio of carbon (C) to nitrogen (N). Blank cells indicate missing values.
  • Type: Nominal
  • Missing values: None specified
CP
  • Label: C:P
  • Definition: Molar ratio of carbon (C) to phosphorus (P). Blank cells indicate missing values.
  • Type: Nominal
  • Missing values: None specified
NP
  • Label: N:P
  • Definition: Molar ratio of nitrogen (N) to phosphorus (P). Blank cells indicate missing values.
  • Type: Nominal
  • Missing values: None specified
AFDM
  • Label: Ash-free dry mass
  • Definition: The mass of the mat sample lost following ignition per unit area.
  • Type: Physical quantity
  • Unit: milligramsPerCentimeterSquared
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • BLANK = No data
CHLA
  • 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:
    • BLANK = No data
AI
  • Label: Autotrophic index
  • Definition: The ratio of chlorophyll-a to ash-free dry mass. Blank cells indicate missing values.
  • Type: Nominal
  • Missing values: None specified

Short name: 

STREAM_ISOTOPES_RCVG

Data set ID: 

9031
People

Owner/Creator: 

Contact: 

Additional Project roles: 

Associated Researcher
Associated Researcher
Associated Researcher
Associated Researcher
Data Manager