Assessing UV-B induced DNA damage in Antarctic plants: is desiccation a compounding factor?
Metadata record for data from ASAC Project 1310
See the link below for public details on this project.
---- Public Summary from Project ----
Increasing UV-radiation over Antarctica each spring may damage DNA in plants. This research determined the susceptibility of Antarctic plants to such damage and investigated the effectiveness of protective and repair mechanisms. This helps predict how plants globally will cope with future climate change.
Samples have been collected from Heard Island, and near Casey Station, Antarctica. Three excel files constitute this dataset.
Heard Island 2003/4 Samples collected for project 1310
Vascular plant UVB site
GPS coordinates of vascular plant UV site 53 06 57 S, 73 43 30E A total of 4 g of each of 5 species (Pringlea antiscorbutica, Poa cookii. Deschampsia antarctica. Azorella selago, Acaena magellanica) were collected on 5 days over the season. These were analysed for DNA damage, UVB absorbing pigments, and photosynthetic and photoprotective pigments. Chlorophyll fluorescence and leaf temperature were measured on the sampled plants.
GPS co-ordinates: high nutrient site: 53 06 0.419S, 73 43 0.105E 4g of P. antiscorbutica and 0.8g of P. cookii were taken at the high nutrient site, along with chlorophyll fluorescence measurements.
GPS co-ordinates: low nutrient site: 53 06 29.09S, 73 43 00.36E 7.2g of P. antiscorbutica and 3.2g of P. cookii were taken at the low nutrient site, along with chlorophyll fluorescence measurements.
GPS co-ordinates: 53 05 0.645S, 073 40 0.339E
3.2 g of P. antiscorbutica plants was sampled and chlorophyll fluorescence measurements taken.
3.2g of P. antiscorbutica plants was sampled and chlorophyll fluorescence measurements taken.
Ceratodon Paddick Valley
GPS co-ordinates: 53 08 43.44S, 73 40 35.42E 3 g of Ceratodon purpureus was collected.
The fields in this dataset are:
grams dry weight (gdw)
Time (Local Time)
Leaf temperature (1, 2, etc)
F - Chlorophyll Fluorescence
Fm' - Fluorescence maximum measured in the light
Yield - Yield of fluorescence
No. and Mark are stamps put on the data during download
Can remote sensing be used to map vegetation and monitor community change in Antarctica?
This dataset consists of Hyperion satellite imagery, as well as GPS ground truthing of vegetation quadrats.
The aims of this project were:
1. to produce a spectral library of the major subantarctic terrestrial plant species and community types from ground spectroradiometery measurements .
2. to use the spectral library to assist in classification of vegetation communities.
File: 2392HI2003_04 Vegetation Survey Data.xls
Table of vegetation data collected from Heard Island in the summer of 2003-2004 by Johanna Turnbull. Areas surveyed were Paddick Valley, Fairchild Beach, Dovers Moraine and Skua Beach. Ten 1x1 m quadrats were sampled with each 30x30 m site surveyed. Quadrats were selected haphazardly. Numbers are given as percentage cover of each species, averaged out over the ten sampled quadrats, unless otherwise stated.
The Codes used for species/ground cover types and vegetation communities/associations can be found in sheet 2 of the excel file, called 'vegetation codes'. They are also listed below:
Vegetation - Species/Ground Cover Types
Code - Species/ground cover types
AM - Acaena magellanica
AS - Azorella selago
CA - Callitriche
CA w/ H2O - Callitriche in water
CO - Colobanthus sp.
DE - Deschampsia
G - Gravel
L - Lichen
LI - Liverwort
M - Moss/Bryophytes
MO - Montia fontana
PA - Pringlea antiscorbutica
PAN - Poa annua
PC - Poa cookii
PK - Poa kuerguelensis
PK/PC - P. kerguelensis / P. cookii Hybrid
R - rock
S - sand / soil
W - Water
Vegetation - Communities / Associations
Code - Community
DCC - Closed Cushionfield
DCC w/ Aceana - Closed Cushionfield with Aceana
DCC/H - Closed Cushionfield/Herbfield
DCC/H/T - Cushionfield/Herbfield/Tussock
FF - Fellfield
H - Herbfield
MF - Mossfield
PC/M - Pool Complex/Meadow
PCC - Open Cushionfield
PCC/MF - Open Cushionfield/Mossfield
SM - Mire/Flush/Meadow
SM/PCC - Mire/Flush/Open Cushionfield
THD - Tussock with Cushionfield/Herbfield
YVES FRENOT 1, DANA M. BERGSTROM 2, J.C. GLOAGUEN 3, R. TAVENARD 4 and D.G. STRULLU 4
1 UMR CNRS 6553 Ecobio, Universit de Rennes 1, Station Biologique, 35380 Paimpont, France,
2 Australian Antarctic Division, Channel Highway, Kingston, Tasmania 7050, Australia,
3 UMR CNRS 6553 Ecobbio, Universit de Rennes 1, campus de Beaulieu, 35042 Rennes cedex, France,
4 Lab. de Biologie et Physiologie V gtales, Universit d'Angers, 2 Bd Lavoisier, 49045 Angers cedex, France.
Roots of nine vascular plant species collected from subantarctic Heard Island were examined for mycorrhizae. Most of these species showed associations with vesicular-arbuscular mycorrhizae or dark septate mycorrhizae. The degree of root infection varied considerably within the sites, appearing to have an inverse relationship with the availability of nutrients in soil. As mycorrhizae are known to play an important role in the nutrient uptake by host-plants, the results suggest that mycorrhizae influence the capacities of plants to colonise in cold and low-nutrient environments such as subantarctic glacier forelands.
Details of Sampling sites
Plant samples were collected in the nine following sites from the eastern side of the island :
1 Unstable Feldmark (Site 1) - 53 6'47.5S-73 42'55.5E, 100m a.s.l.: sheltered east side of a moraine, just under a crest. Vegetation dominated by Pringlea antiscorbutica with low cover (less than 20%) and sparse individuals of Poa kerguelensis, Colobanthus kerguelensis and small cushions of Azorella selago. The total vegetation cover did not exceeded 40%. The mineral soil was coarse.
2 Open cushion carpet (Site 2) - 53 6'45.6S-73 43'07.6E, 43 m a.s.l.: gentle slope (3) at the bottom of a morainic slope, oriented east, with low vegetation cover (less than 40%) dominated by Azorella selago cushions. Poa kerguelensis, Colobanthus kerguelensis and bryophytes were also present. Soil was mineral. Presence of some burrows of petrels.
3 Closed cushion carpet (Site 3) - 53 6'43.6S-73 43'13.1E, 29 m a.s.l.: flat area covered with large cushions of Azorella selago which were coalesced into extensive carpets. Bryophytes were locally developed at the bottom of cushions. Soil was mineral between the cushion but peat accumulated under the vegetation. Few burrows of petrels were prs were present.
4 Pringlea hebfield slope (Site 4) - 53 6'32.3S-73 43'13.4E, 23 m a.s.l.: Morainic slope (20) oriented east, with a pure stand of Kerguelen cabbage, Pringlea antiscorbutica (greater than 80 % cover). Soil was organic and deep (greater than 50 cm).
5 Wet biotic vegetation (Site 5) - 53 6'39.3S-73 43'22.8E, 19 m a.s.l.: flat area occupied by several ponds (1-5 m in area). The plant community showed the highest species richness, including Acaena magellanica, Poa cookii, Deschampsia antarctica, Callitriche antarctica, Azorella selago, Colobanthus kerguelensis and numerous bryophytes. Soil was peaty in concave areas and more mineral elsewhere. This site was occasionally visited by fur seals or King Penguins during the moult.
6 Maritime biotic vegetation (Site 6) - 53 6'34.2S-73 43'25.7E, 15 m a.s.l.: coastal area characterised by tussocks of Poa cookii and Azorella selago cushions forming a chaotic microrelief. Callitriche antarctica grew at the bottom of tussocks. Soil was mainly sandy.
7 Stephenson glacier forelands (Site 7) - 53 5'54.8S-73 41'40.2E, 4 m a.s;l.: flat area near the proglacial lake. Poa annua grew either in close communities where it was dominant (other species being Poa kerguelensis, Deschampsia antarctica, Azorella selago, Callitriche antarctica and Pringlea antiscorbutica), or in open communities where it grew as sparse individuals. Soil was mineral and, in some places, very rich in fine particles (thixotropy).
8 Winston glacier forelands (Site 8) - 53 9'20.6S-73 38'30.8E, 8 m a.s.l.: Mossy seepage areas near snout of the Winston Glacier. P. annua grew in a stream-line on a very young morainic deposit, with Acaena magellanica, Montia fontana and liverworts.
9 Skua Beach (Site 9) - 53 5'18.8S-73 40'38.9E, 5 m a.s.l.: On moraine outwash plain approximately 200m inland, at seaward edge of extensive area of moss flushes (with Poa annua, Pringlea antiscorbutica, Deschampsia antarctica, Montia fontana, Acaena magellanica) growing along braided streams aided streams and coalescing to form large expanses of wet vegetation. This area was under ice in 1947.
This metadata record is part of ASAC project 1015 (ASAC_1015). ASAC project 1015 forms part of the Regional Sensitivity to Climate Change (RiSCC) program.
See Publication/Reference for citation of a paper which includes the data described by this metadata record.
The paper is available for download from the provided URL. See also Access Constraints.