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Population increase in Deschampsia Antarctica: genotypic variation or phenotypic plasticity?
Entry ID: Deschampsia_project_NL_Wouw


Summary
Abstract: PROBLEM DEFINITION

Genetic exchange between local populations of Deschampsia Antarctica (Poaceae), one of the two phanerogams occurring in Antarctica, might be difficult. Dispersal of the species within and between vegetated areas is believed to be via rain splash and via birds, collecting tufts of the species for nesting material, thus facilitating both vegetative and generative dispersal, but this is probably of local importance only. Its long distance dispersion is unclear. And yet, the species has a large distribution area, ranging from the frigid Antarctic to oceanic and alpine habitats. A marked increase in numbers of individual plants in established populations, as well as a vigorous colonization of recently deglaciated areas over the last four decades has been reported. Recent publications report also vigorous flowering, as well as abundant seed set and presence of seedlings throughout its distribution area, often attributed to parameters of global change, especially temperature increase. The fact that the species becomes more reproductive with increasing temperature could be either a plastic response, or selection for more reproductive genotypes under a changing temperature regime, or both. The role of genetic variation and phenotypic plasticity in the adaptation of Deschampsia Antarctica to increasing temperatures and its recent colonization of deglaciated areas is the aim of this study.

OBJECTIVES
-To investigate if colonization of new areas is restricted to special genotypes, which possess special traits or are more plastic than others.
-To establish the genotypic variation within and between geographically disjunct populations.
-To establish the level of plasticity in generative traits of Deschampsia Antarctica, with respect to the key environmental factors: temperature and moisture.

APPROACH

Using molecular techniques, the genotypic variation of D. Antarctica will be established in living samples and samples taken from herbarium specimens. From herbarium material only chlorophyll DNA can be successfully analyzed. Fresh material will be collected and preserved for the collection of nuclear DNA. Within and between population variability will be studied at the genotypic level using the overall AFLP fingerprint similarity as well as at the gene level, assuming Hardy Weinberg equilibriums (Schneider et al. 2000). Chloroplast DNA variation will be investigated using universal primers and digestion with restriction enzymes. This will provide phylogenetic analysis of the regions (phylogeography) and possibly allow a reconstruction of historical colonization patterns. The amount of nuclear DNA will be determined by flow cytometry of fresh material in different populations as this may affect the duration of the life cycle (Bennett et al, 1982).

Genotypic variation and phenotypic plasticity in reproductive traits will be determined by growing cloned plant-genotypes from different populations under a set of environmental (temperature, moisture) circumstances and measure generative traits. Differences in the response of genotypes or populations to these environmental conditions would indicate within- or among population variation in reproductive traits.

Related URL
Link: View Related Information
Description: Journal of Biogeography, Volume 35, Issue 2 (p 365-376)

Geographic Coverage
 N: -47.0 S: -67.6  E: 51.0  W: -68.34

 Min Altitude: 0  Max Altitude: 300

Data Set Citation
Dataset Creator: Mark Van de Wouw
Dataset Title: Molecular genetics Deschampsia antarctica
Dataset Series Name: Genetic configuration Deschampsia antarctica populations
Dataset Release Date: 2009-02-12T00:00:00.000Z
Dataset Release Place: Royal Netherlands Institute for Sea Research (NIOZ
Dataset Publisher: A.H.L. Huiskes
Version: Not provided


Temporal Coverage
Start Date: 2003-01-01
Stop Date: 2006-03-01


Paleo_Temporal_Coverage
Chrono Unit:


Location Keywords
OCEAN > SOUTHERN OCEAN > CROZET ISLANDS
OCEAN > SOUTHERN OCEAN > HEARD ISLAND
OCEAN > SOUTHERN OCEAN > KERGUELEN ISLANDS
OCEAN > SOUTHERN OCEAN > FALKLAND ISLANDS
CONTINENT > ANTARCTICA > PENINSULA
GEOGRAPHIC REGION > POLAR


Science Keywords
BIOSPHERE >ECOSYSTEMS >TERRESTRIAL ECOSYSTEMS >ALPINE/TUNDRA    [Definition]
BIOSPHERE >ECOSYSTEMS >TERRESTRIAL ECOSYSTEMS >GRASSLANDS    [Definition]
BIOLOGICAL CLASSIFICATION >PLANTS >ANGIOSPERMS (FLOWERING PLANTS) >MONOCOTS >DESCHAMPSIA ANTARCTICA    [Definition]


Platform
FIELD SURVEYS    [Information]


Instrument
FLUORESCENCE SPECTROSCOPY    [Information]


Project
RISCC >Regional Sensitivity to Climate Change    [Information]
EBA >Evolution and Biodiversity in the Antarctic    [Information]


Data Set Progress
COMPLETE


Data Center
National Antarctic Data Centre, Netherlands Institute for Sea Research, Netherlands Organization for Scientific Research, Netherlands    [Information]
Data Center URL: http://www.nioo.knaw.nl/

Data Center Personnel
Name: TACO F. DE BRUIN
Phone: +31-222-369 479
Fax: +31-222-319674
Email: bruin at nioz.nl
Contact Address:
P.O. Box 59
City: Den Burg
Postal Code: 1790 AB
Country: The Netherlands


Personnel
MARK VAN DE WOUW
Role: INVESTIGATOR
Role: TECHNICAL CONTACT
Phone: +31-317-480 916
Fax: +31-317-484 884
Email: Mark.vandewouw at wur.nl
Contact Address:
P.O. Box 9101
City: Wageningen
Postal Code: 6700 HB
Country: THE NETHERLANDS


AD HUISKES
Role: METADATA AUTHOR
Phone: +31 (0)113 577445
Fax: +31 (0)113 573616
Email: ad.huiskes at nioz.nl
Contact Address:
Royal Netherlands Institute for Sea Research (NIOZ)
P.O.Box 140
City: Yerseke
Province or State: Zeeland
Postal Code: 4400 AC
Country: The Netherlands


Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2009-02-12
Last DIF Revision Date: 2018-08-29



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