Hyporheic diatom community assemblages from transects across Von Guerard Stream, Taylor Valley, Antarctica, January 2019

Summary

Abstract: 

In this data package, we present diatom community assemblages from hyporheic sediments collected in January 2019 from six transects across Von Guerard Stream, Taylor Valley, Antarctica. These samples were collected to address questions about the retention and processing of particulate organic matter in the hyporheic zone of McMurdo Dry Valley streams. The six transects were located at pools, riffles, and meanders (three of each geomorphology type) along Von Guerard Stream and extended across the stream channel to the edges of the wetted zone, ranging from 6.6 to 13.6 m in length. At each sampling location, we collected subsurface sediment sample that was preserved in formalin directly after sample collection. We characterized diatom assemblages by counting a total of 300 diatom valves from each preserved diatom sample. This data package is associated with a complementary data package that contains hyporheic sediment chemistry for the same samples.

Date Range: 

January 10, 2019
Data Citation
Darling, J., Heindel, R.C., Singley, J.G., Bergstrom, A.J., Mcknight, D.M. 2020. McMurdo Dry Valleys LTER: Hyporheic diatom community assemblages from transects across Von Guerard Stream, Taylor Valley, Antarctica, January 2019. Environmental Data Initiative. DOI: 10.6073/pasta/f79bdbca0e3e97ef5f1b4007d2f008eb. Dataset accessed 27 November 2020.
Dataset(s)

Variables (click to expand): 

DATASET_CODE
  • Label: Dataset code
  • Definition: Internal dataset code.
  • Type: Nominal
  • Missing values: None specified
STREAM
  • Label: Stream name
  • Definition: Name of the stream where sample was collected.
  • Type: Nominal
  • Missing values: None specified
SAMPLE_DATE
  • Label: Sample date
  • Definition: Date samples were collected.
  • Type: Date/time
  • Date format: MM/DD/YYYY
  • Missing values: None specified
SAMPLE_ID
  • Label: Sample identifier
  • Definition: Unique sample identifier that contains the geomorphology type, the transect number, and the lateral position. Sample identifiers are based on location, e.g., P1-3 refers to a sample collected from pool transect number 1 (upper transect) and at position 3 of 5 across the transect.
  • Type: Code list
  • Codes:
    • M = meander
    • P = pool
    • R = riffle
  • Missing values: None specified
TRANSECT
  • Label: Transect identifier
  • Definition: Transect identifier. Transects are numbered from north to south.
  • Type: Code list
  • Codes:
    • M = meander
    • P = pool
    • R = riffle
  • Missing values: None specified
GEOMORPH
  • Label: Geomorphic classification
  • Definition: Geomorphic classification type of the sample/transect location.
  • Type: Nominal
  • Missing values: None specified
LATERAL_POSITION
  • Label: Lateral position
  • Definition: Lateral position of the sample across the transect.
  • Type: Code list
  • Codes:
    • 1 = margin of the wetted zone (inside bank for meanders)
    • 2 = intermediate
    • 3 = stream thalweg
    • 4 = intermediate
    • 5 = margin of the wetted zone (outside bank for meanders)
  • Missing values: None specified
TAXON_ID
  • Label: Taxon identifier
  • Definition: Taxon identifier relates observed species to current (as of August 2020) taxonomy updated to the Antarctic Freshwater Diatoms Database: http://huey.colorado.edu/diatoms/taxa/index.php
  • Type: Nominal
  • Missing values: None specified
SPECIES
  • Label: Species
  • Definition: Genus and specific epithet of species using taxonomy current as of August 2020.
  • Type: Nominal
  • Missing values: None specified
ABUNDANCE
  • Label: Relative abundance
  • Definition: Qualitative, percent relative abundance for each species in each sample.
  • Type: Physical quantity
  • Unit: percent
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified

File: 

HZSEDS_DIATOMS.csv (117.13 KB)

...or query the dataset by variables and dates of interest:

Short name: 

HZSEDS_DIATOMS

Dataset ID: 

9034