Sea Ice Biota of Coastal Eastern Antarctica

The distribution and abundance of ice-associated copepods in the fast ice of the Australian Antarctic Territory were investigated over a distance of approximately 650 km between October and December 1995. The six sites where collections were made were: offshore from Mawson station, Larsemann Hills (including Nella Bay), Rauer Islands (ice edge near Filla Is), O'Gorman Rocks and Bluff Island near Davis Station, and Murphy Rocks in the northern Vestfold Hills.

Ice cores were obtained using SIPRE ice augers. Five to ten cores were collected along transects several km in length. Thickness of sea ice and snow cover were measured at each sampling site. Chlorophyll a concentrations were determined for each core. Copepods were isolated from the melted core water and identified and counted. Zooplankton tows were also made at each site where

cores were collected.

Nine species of copepods were identified from the cores. However, of these, only three were recorded regularly: Paralabidocera antarctica, Drescheriella glacialis and Stephos longipes. The abundance of copepods ranged between 0 and 147/L. The highest densities were recorded at the Larsemann Hills and the lowest at Murphy Rocks. Within the cores, the highest abundances were found in the bottom 10 cm of ice, irrespective of the species. Chlorophyll a concentrations ranged between 0.9 and 373 mg/m3.

Data available: excel files containing sampling dates, sampling sites and abundances (number per L) of three dominant sea ice copepods, Paralabidocera antarctica, Drescheriella glacialis, Stephos longipes. Data are presented for developmental stages (nauplii, copepodites and adults) where available. Totals are also provided. Vertical distribution in some cores is also provided. Chlorophyll a concentrations (ug/L) provided for most sites. Detailed information about each of the spreadsheets is provided below:

The chlorophyll spreadsheet shows chlorophyll concentrations for 5 sites in the AAT. The column headings are:

core - reference number of the core collected

subsection - depth in the core in cm

volume - vol of melted core water

volume added - 1 L of filtered seawater for melting

% original - amount of total that core water represents (i.e. minus the 1L added)

aliquot - volume subsampled for chlorophyll analysis

acetone - amount added (mL) for extraction

750, 664, 647, 630 - wavelengths where absorbance was measured

chloro a - amount of chlorophyll a in the sample

ug/L - chloro a expressed as a concentration

The spatial spreadsheet shows species abundances of three copepods at 4 sites

N1 to NVI - nauplius stage 1 to 6 of a species

CI to CVI - copepodite stage 1 to 6 of a species

F or M - female or male of copepodite stage 5 or 6

1,1 etc - cores 1 and 2 from site 1 within a major location (e.g. 2 cores close together in the Larsemann Hills)

The temporal spreadsheet shows abundances over time at 2 sites (O'Gorman Rocks, Bluff Is) near Davis and two species (Paralabidocera antarctica and Drescheriella glacialis) on several sampling dates

N1 to N3 - total nauplii in each of three cores (i.e. not separated into stages as above)

C1 to C3 - total copepodites

A1 to A3 - total adults

Then at the bottom are the means of each three cores.

Identification info

Alternate title: Sea Ice Biota of Coastal Eastern Antarctica

Date (Publication): 2001-05-10

Edition: 1

Citation identifier

Dataset DOI

Title: Information and documentation - Digital object identifier system

Date (Publication): 2012-04-23

Citation identifier: ISO 26324:2012

Citation identifier: doi:10.4225/15/584a08bc413e3

Originator

Swadling, K.

Publisher

Australian Antarctic Data Centre

Principal investigator

SWADLING, KERRIE

School of Zoology

University of Tasmania

GPO BOX 252-05

Hobart

Tasmania

7001

Australia

+61 3 6226 2522

+61 3 6226 2745 (facsimile)

Collaborator

SWADLING, KERRIE

School of Zoology

University of Tasmania

GPO BOX 252-05

Hobart

Tasmania

7001

Australia

+61 3 6226 2522

+61 3 6226 2745 (facsimile)

Name: CAASM Metadata

Website: https://data.aad.gov.au/metadata/records/ASAC_875

Status: Completed

Custodian

AU/AADC > Australian Antarctic Data Centre, Australia - AADC, DATA OFFICER (DATA CENTER CONTACT)

Australian Antarctic Division

203 Channel Highway

Kingston

Tasmania

7050

Australia

+61 3 6232 3244

+61 3 6232 3351 (facsimile)

Topic category

Biota
Oceans

Extent

Description: Temporal Coverage

Temporal extent

TimePeriod: 1995-10-01 1995-12-31

Title: Spatial distribution of copepods in fast ice of eastern Antarctica

Date (Publication): 2000

Citation identifier: 13

Author

Swadling, KM, McPhee AD, McMinn A

Name: Polar Bioscience

Page: 55-65

Title: Life cycle plasticity and differential growth and development in marine and lacustrine populations of an Antarctic copepod.

Date (Publication): 2004

Citation identifier: 49