[Parameters: Topic='BIOSPHERE', Term='VEGETATION', Variable_Level_1='NITROGEN']
A Study of the Nitrogen-fixing Microbiota of Macquarie Island Plant CommunitiesEntry ID: ASAC_194
Abstract: The nitrogen fixing biota of Macquarie Island are dominated by cyanobacteria growing epiphytically or symbiotically with plants or lichens. Highest rates of acetylene reduction (N-fixation) were found in the leafy lichen Peltigera sp. Colonising herbfields and short grasslands, and in the coastal angiosperm Colobanthus muscoides. Significant rates of N-fixation were also associated with the ... liverwort Jamesoniella colorata commonly occurring in coastal and plateau mires, in a moss-bed of Dicranella cardotii colonising a land-slip face on the grassland slopes at 100m altitude, and within polsters of the mosses Ditrichum strictum and Andreaea sp. found in exposed localities on the plateau at 200-300m altitude. It was concluded that the common feature of plants supporting active N-fixation in dry habitats was the dense packing of stems and leaves, enabling water translocation to the cyanobacterial zone by wick action. Epiphytic cyanobacterial fixation in wet habitats was widespread and not restricted to plant species.
This work was published in Polar Biology, 11: 601-606.
Start Date: 1990-12-01Stop Date: 1991-01-31
BIOSPHERE > VEGETATION > NITROGEN
BIOLOGICAL CLASSIFICATION > BACTERIA/ARCHAEA
BIOLOGICAL CLASSIFICATION > PLANTS > ANGIOSPERMS (FLOWERING PLANTS)
BIOLOGICAL CLASSIFICATION > PLANTS > MOSSES/HORNWORTS/LIVERWORTS
BIOLOGICAL CLASSIFICATION > FUNGI > LICHENS
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > NUTRIENT CYCLING
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Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_194 when using these data.
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Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: +61 3 6226 2636
Fax: +61 3 6226 2642
Email: martin.line at utas.edu.au
SCHOOL OF AGRICULTURAL SCIENCE GPO BOX 252-54 University of Tasmania
Province or State: Tasmania
Postal Code: 7001
Line M.A. (1992), Nitrogen fixation in the sub-Antarctic Macquarie Island, Polar Biology, 11, 601-606
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DIF Creation Date: 2000-07-20
Last DIF Revision Date: 2014-01-10