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Distribution and Viability of Zooplankton Eggs from Anoxic Sediments from the Vestfold Hills, Antarctica
Entry ID: ASAC_706


Summary
Abstract: Data set contains sediment cores from three saline lakes in the Vestfold Hills. The three lakes are Ace Lake, Lake Pendant and Lake Abraxas. Short cores from each lake are sectioned into 1 cm intervals. One 1.8 m core from Ace Lake is sectioned into 1 cm intervals. All sediments maintained at 4 degrees C.

Detailed analyses of sections for remains of invertebrates - including tintinnids, forams, copepod eggs, copepod spermatophores, rotifer loricae, rotifer eggs, copepod exoskeletons, ciliates and tardigrades.

Data for this project are unfortunately not available, as they have been lost. All that remains are copies of the theses produced from this work (stored at the University of Tasmania), as well as three publications, which are attached to this metadata record, and are available for download to Australian Antarctic Division staff only.

Taken from the abstracts of the referenced papers:

The sediment record of the fauna of Ace Lake, a saline meromictic lake in the Vestfold Hills, Antarctica, consists of copepod eggs, spermatophores and exoskeletal fragments, rotifer and tintinnid loricae, and foraminiferal and folliculinid tests. The relative abundance of these remains, along with other characteristics of the core, allows the development of a coherent picture of the progress of Ace Lake from a species-poor, freshwater lake early in the Holocene to a biodiverse marine basin following a marine transgression. Subsequent sea level fall reformed Ace Lake as a saline lake and productivity initially increased after isolation. After a major event, possibly associated with overturn of the meromictic lake, biodiversity and productivity decreased, and have continued to do until the present.

Evidence is provided from a sediment core from saline Abraxas Lake, Vestfold Hills, that indicates that the lake existed through the Last Glacial Maximum, or at most was covered by a thin, non-erosive cold-based ice sheet. The evidence for the continued existence of Abraxas Lake includes a 14C date that significantly predates the Last Glacial Maximum (though this cannot be considered direct proof of the existence of the lake prior to the Last Glacial Maximum); the presence of saline porewater throughout the core, including in compacted sediments deposited during the glacial period, which implies that the lake obtained its salt prior to any Holocene marine highstand; and the occurrence of marine-derived fauna from the onset of significant biological activity late in the Pleistocene. The occurrence of ice-free land in the Vestfold Hills and similar oases suggests that the margin of the polar ice cap did not reach far beyond its current position at the Last Glacial Maximum, at least in regions now occupied by these oases.

Paratrochammina minutissima n. sp. is described from Abraxas and Ace Lakes in the Vestfold Hills, East Antarctica. The species is characterised by very small size (120 microns in diameter), 4.5 chambers in the final whorl, weak adherence of particles to the tectin chamber lining and a relatively prominent proloculus. Similar species occur in the fully marine environment and often in the abyssal ocean. Subfossil tests were observed in sediment cores from Abraxas Lake, possibly indicating a lifestyle partly attached to zooplankton or floating debris, or floating unattached on density surfaces within the meromictic lake. The distribution of subfossil Paratrochammina minutissima in the sediments of Ace Lake was consistent with a marine origin for the species, while the distribution in the Abraxas Lake sediment indicated that the lake might predate the last glacial maximum.

Related URL
Link: View Related Information
Description: Public information for ASAC project 706


Link: View Related Information
Description: Download point for the papers - AAD Staff Only


Link: View Related Information
Description: Citation reference for this metadata record and dataset

Geographic Coverage
 N: -68.576614 S: -68.576614  E: 77.96739  W: 77.96739

Data Set Citation
Dataset Creator: Swadling, K.
Dataset Title: Distribution and Viability of Zooplankton Eggs from Anoxic Sediments from the Vestfold Hills, Antarctica
Dataset Series Name: CAASM Metadata
Dataset Publisher: Australian Antarctic Data Centre
Online Resource: https://data.aad.gov.au/aadc/metadata/metadata_redirect.cfm?md=/AMD...


Temporal Coverage
Start Date: 1994-11-01
Stop Date: 1995-02-28


Paleo_Temporal_Coverage
Paleo Start Date: 40000 YBP
Chrono Unit:


Location Keywords
CONTINENT > ANTARCTICA
CONTINENT > ANTARCTICA > Davis
CONTINENT > ANTARCTICA > Vestfold Hills
GEOGRAPHIC REGION > POLAR


Science Keywords
PALEOCLIMATE >LAND RECORDS >ISOTOPES    [Definition]
PALEOCLIMATE >OCEAN/LAKE RECORDS >ISOTOPES    [Definition]
PALEOCLIMATE >OCEAN/LAKE RECORDS >MICROFOSSILS    [Definition]
PALEOCLIMATE >OCEAN/LAKE RECORDS >SEDIMENTS    [Definition]
PALEOCLIMATE >OCEAN/LAKE RECORDS >STRATIGRAPHIC SEQUENCE    [Definition]
BIOSPHERE >ECOSYSTEMS >AQUATIC ECOSYSTEMS >PLANKTON >ZOOPLANKTON    [Definition]
BIOSPHERE >ECOSYSTEMS >AQUATIC ECOSYSTEMS >PLANKTON    [Definition]
BIOSPHERE >ECOSYSTEMS >FRESHWATER ECOSYSTEMS >LAKE/POND >SALINE LAKES    [Definition]
BIOSPHERE >ECOLOGICAL DYNAMICS >COMMUNITY DYNAMICS >COMMUNITY STRUCTURE    [Definition]


Instrument
MICROSCOPES    [Information]


Quality
Short sediment cores from several saline lakes in the Vestfold Hills.


Access Constraints
Data for this project are no longer available. Copies of three of the referenced publications are available for download to AAD staff only at the provided URL.


Use Constraints
This data set conforms to the PICCCBY Attribution License
(http://creativecommons.org/licenses/by/3.0/).

Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_706 when using these data.


Keywords
COPEOPOD EGGS
FORAMINIFERA
MICROFOSSILS
PALAEOCOLOGY
ROTIFERS
SALINE LAKES
TARDIGRADES
ZOOPLANKTON REMAINS


Data Set Progress
COMPLETE


Originating Center
Australian Antarctic Division


Data Center
Australian Antarctic Data Centre, Australia    [Information]
Data Center URL: http://data.aad.gov.au

Data Center Personnel
Name: DATA OFFICER AADC
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: metadata at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia



Distribution
Distribution_Media: HTTP
Distribution_Size: 3.9 MB
Distribution_Format: pdf
Fees: Free


Personnel
KERRIE SWADLING
Role: INVESTIGATOR
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: +61 3 6226 2522
Fax: +61 3 6226 2745
Email: k.swadling at utas.edu.au
Contact Address:
School of Zoology
University of Tasmania
GPO BOX 252-05
City: Hobart
Province or State: Tasmania
Postal Code: 7001
Country: Australia


Publications/References
Louise Cromer (2001), Reconstruction of the Holocene evolution of Ace Lake, Antarctica, using faunal remains, University of Tasmania Honours thesis, 105

Camille White (2003), Reconstruction of past communities from faunal remains preserved in the sediment of three saline lakes of the Vestfold Hills, East Antarctica, University of Tasmania Honours thesis, 138

Kristina Paterson (2004), Unravelling the history of Abraxas Lake, Vestfold Hills (East Antarctica), University of Tasmania Honours thesis, 108

Gibson, J.A.E., Paterson, K. S., White, C. A. and Swadling, K.M. (2009), Evidence for the continued existence of Abraxas Lake, Vestfold Hills, East Antarctica during the last Glacial Maximum, Antarctic Science, 21, 269-278

Gibson, J.A.E., Quilty, P.G., Swadling, K.M., Newman, L. and Paterson, K.S. (2008), Paratrochammina minutissima n. sp. in brackish, marine-derived lakes of the Vestfold Hills, East Antarctica, Journal of Foraminiferal Research, 38, 292-297

Cromer, L., Gibson, J.A.E, Swadling, K.M. and Ritz, D.A. (2005), Faunal microfossils: Indicators of Holocene ecological change in a saline Antarctic lake, Palaeogeography, Palaeoclimatology, Palaeoecology, 221, 83-97
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2000-08-04
Last DIF Revision Date: 2018-07-10



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