Full description
Metadata record for data from ASAC Project 2663See the link below for public details on this project.
Public Summary
Macquarie Island offers scientists a unique laboratory for investigating subantarctic climate change. We will establish the biodiversity of microalgal flora (specifically diatoms) within the lakes and lagoons of Macquarie Island and ultimately use the flora of today to investigate changes in fossil microalgal communities of Macquarie Island lake and lagoon ecosystems to better understand past, present and future climate change in the Australian Subantarctic.
Taken from the abstract of the referenced paper:
This study is the first established survey of diatom-environment relationships on sub-Antarctic Macquarie Island. Fifty-eight sites in 50 coastal and inland lakes were sampled for benthic diatoms and water chemistry. 208 diatom species from 34 genera were identified. Multivariate analyses indicated that the lakes were distributed along nutrient and conductivity gradients. Conductivity, pH, phosphate (SRP), functions provide a quantitative basis for palaeolimnological studies of past climate change and human impacts, and can be used to establish baseline conditions for assessing the impacts of recent climate change and the introduction of non-native plants and animals. Statistically robust diatom transfer functions for conductivity, phosphate and silicate were developed, while pH and temperature transfer functions performed less well. The lower predictive abilities of the pH and temperature transfer functions probably reflect the broad pH tolerance range of diatoms on Macquarie Island and uneven distribution of lakes along the temperature gradient. This study contributes to understanding the current ecological distribution of Macquarie Island diatoms and provides transfer functions that will be applied in studies of diatoms in lake sediment cores to quantitatively reconstruct past environmental changes.
Lineage
Progress Code: completed
Statement: The latitudes and longitudes provided in spatial coverage are approximate only.
Taken from the referenced paper:
Fifty-eight sites in 50 ponds and lakes on the coastal terrace and plateau were sampled during a six week period from February-April 2006. These sites include most ponds and lakes on Macquarie Island. The largest four lakes were sampled at two locations (at the western and eastern sides) to try and account for spatial variability in nutrients and conductivity. At each site, surface sediment samples (top 1cm) were collected from about 1 metre water depth using a hand-operated gravity corer (Glew 1991). While there are a few deep lakes on Macquarie Island, most are shallow and only 1-2 metres deep. Consequently, samples were collected from about 1 metre depth throughout the sampling campaign. At each site, surface water conductivity, dissolved oxygen, pH, temperature and turbidity were measured using a Hydrolab Datasonde 4a. Duplicate water samples were collected for soluble reactive phosphate (SRP), nitrate/nitrite and silicate analyses. Sample tubes were rinsed several times in lake water at each site prior to collection. Samples for nutrient analysis were frozen as soon as possible after collection and analysed using an Alpkem Autoanalyzer (Continuous Flow Solution Analyzer) at the Commonwealth Scientific and Industrial Research Organisation Marine and Atmospheric Laboratories, Hobart, in May 2006. The autoanalyser uses the principles of colourimetric analysis in a continuous flow system with all manipulations of the samples automated. Each analytical channel was calibrated using standards of known concentration.
Data time period: 2006-02-01 to 2006-04-09
text: westlimit=158.8; southlimit=-54.7; eastlimit=158.9; northlimit=-54.6
Subjects
AMD |
AMD/AU |
CEOS |
EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE |
EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE > DIATOMS |
EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PROTISTS > DIATOMS |
EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > FRESHWATER ECOSYSTEMS > LAKE/POND |
EARTH SCIENCE > PALEOCLIMATE > OCEAN/LAKE RECORDS > MICROFOSSILS |
FIELD INVESTIGATION |
FIELD SURVEYS |
GEOGRAPHIC REGION > POLAR |
OCEAN > SOUTHERN OCEAN |
OCEAN > SOUTHERN OCEAN > MACQUARIE ISLAND |
biota |
climate change |
flora |
fossils |
global warming |
inlandWaters |
lagoons |
lakes |
limnology |
microalgae |
palaeolimnology |
User Contributed Tags
Login to tag this record with meaningful keywords to make it easier to discover
Other Information
Download point for the data (GET DATA)
url :
http://data.aad.gov.au/aadc/portal/download_file.cfm?file_id=3195
Public information for ASAC project 2663 (PROJECT HOME PAGE)
url :
https://projects.aad.gov.au/search_projects_results.cfm?project_no=2663
Citation reference for this metadata record and dataset (VIEW RELATED INFORMATION)
url :
http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2663
Identifiers
- global : ASAC_2663
