Patterned quaking mire at Handspike Point, Macquarie Island
Raised mires occur on an emerging marine terrace of Holocene age at Handspike Point, Macquarie Island, and slope seawards. Ponions of these mires are characterised by numerous, anastomosing to parallel, low peat ridges, separated by waterlogged troughs. The resulting patterns arc accentuated by the...
Published in: | Papers and Proceedings of the Royal Society of Tasmania |
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1996
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ftunivtasmania:oai:eprints.utas.edu.au:13662 2023-05-15T17:09:56+02:00 Patterned quaking mire at Handspike Point, Macquarie Island Rich, J 1996 application/pdf https://eprints.utas.edu.au/13662/ https://eprints.utas.edu.au/13662/4/1996-part1-Rich-patterned.pdf en eng https://eprints.utas.edu.au/13662/4/1996-part1-Rich-patterned.pdf Rich, J 1996 , 'Patterned quaking mire at Handspike Point, Macquarie Island' , Papers and Proceedings of the Royal Society of Tasmania, vol. 130, no. 1 , pp. 49-66 , doi:10.26749/rstpp.130.1.49 <http://dx.doi.org/10.26749/rstpp.130.1.49>. cc_utas Royal Society of Tasmania RST Van Diemens Land natural history science ecology taxonomy botany zoology geology geography papers & proceedings Australia UTAS Library Article PeerReviewed 1996 ftunivtasmania https://doi.org/10.26749/rstpp.130.1.49 2020-05-30T07:27:24Z Raised mires occur on an emerging marine terrace of Holocene age at Handspike Point, Macquarie Island, and slope seawards. Ponions of these mires are characterised by numerous, anastomosing to parallel, low peat ridges, separated by waterlogged troughs. The resulting patterns arc accentuated by the distinctive rosette plant Pleurophyllurn hookeri, which grows only on the ridges. Sampling suggests that ridge and trough patterns persist to at least l.)m depth. Pleurophy/lum colonisation appears to be a function of the difference in trough: ridge peat bulk density. As chis density ratio approaches 0.8, waterlogging decreases and Pleurophyllurn vigour is enhanced. Patterns are oriented at various angles to the present surface slopes, bur roughly parallel to the plateau margin and normal to the regional slope of the marine terrace. The divergence between pattern and local contour orientation results from non-uniform accretion. Patterns at angles to the contours appear to provide benefits which include enhanced water-level stability. The Handspike mires exhibit many characteristics of patterned and non-pancrned peatlands ubiquitous throughout the Northern Hemisphere, with particular similarities to eccentric domed mires of the Baltic region. Vertical accretion is estimated to average 1mm yr-1; lateral accretion appears to be in equilibrium with the emerging marine terrace. Article in Journal/Newspaper Macquarie Island University of Tasmania: UTas ePrints Papers and Proceedings of the Royal Society of Tasmania 130 1 49 66 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
Royal Society of Tasmania RST Van Diemens Land natural history science ecology taxonomy botany zoology geology geography papers & proceedings Australia UTAS Library |
spellingShingle |
Royal Society of Tasmania RST Van Diemens Land natural history science ecology taxonomy botany zoology geology geography papers & proceedings Australia UTAS Library Rich, J Patterned quaking mire at Handspike Point, Macquarie Island |
topic_facet |
Royal Society of Tasmania RST Van Diemens Land natural history science ecology taxonomy botany zoology geology geography papers & proceedings Australia UTAS Library |
description |
Raised mires occur on an emerging marine terrace of Holocene age at Handspike Point, Macquarie Island, and slope seawards. Ponions of these mires are characterised by numerous, anastomosing to parallel, low peat ridges, separated by waterlogged troughs. The resulting patterns arc accentuated by the distinctive rosette plant Pleurophyllurn hookeri, which grows only on the ridges. Sampling suggests that ridge and trough patterns persist to at least l.)m depth. Pleurophy/lum colonisation appears to be a function of the difference in trough: ridge peat bulk density. As chis density ratio approaches 0.8, waterlogging decreases and Pleurophyllurn vigour is enhanced. Patterns are oriented at various angles to the present surface slopes, bur roughly parallel to the plateau margin and normal to the regional slope of the marine terrace. The divergence between pattern and local contour orientation results from non-uniform accretion. Patterns at angles to the contours appear to provide benefits which include enhanced water-level stability. The Handspike mires exhibit many characteristics of patterned and non-pancrned peatlands ubiquitous throughout the Northern Hemisphere, with particular similarities to eccentric domed mires of the Baltic region. Vertical accretion is estimated to average 1mm yr-1; lateral accretion appears to be in equilibrium with the emerging marine terrace. |
format |
Article in Journal/Newspaper |
author |
Rich, J |
author_facet |
Rich, J |
author_sort |
Rich, J |
title |
Patterned quaking mire at Handspike Point, Macquarie Island |
title_short |
Patterned quaking mire at Handspike Point, Macquarie Island |
title_full |
Patterned quaking mire at Handspike Point, Macquarie Island |
title_fullStr |
Patterned quaking mire at Handspike Point, Macquarie Island |
title_full_unstemmed |
Patterned quaking mire at Handspike Point, Macquarie Island |
title_sort |
patterned quaking mire at handspike point, macquarie island |
publishDate |
1996 |
url |
https://eprints.utas.edu.au/13662/ https://eprints.utas.edu.au/13662/4/1996-part1-Rich-patterned.pdf |
genre |
Macquarie Island |
genre_facet |
Macquarie Island |
op_relation |
https://eprints.utas.edu.au/13662/4/1996-part1-Rich-patterned.pdf Rich, J 1996 , 'Patterned quaking mire at Handspike Point, Macquarie Island' , Papers and Proceedings of the Royal Society of Tasmania, vol. 130, no. 1 , pp. 49-66 , doi:10.26749/rstpp.130.1.49 <http://dx.doi.org/10.26749/rstpp.130.1.49>. |
op_rights |
cc_utas |
op_doi |
https://doi.org/10.26749/rstpp.130.1.49 |
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Papers and Proceedings of the Royal Society of Tasmania |
container_volume |
130 |
container_issue |
1 |
container_start_page |
49 |
op_container_end_page |
66 |
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1766066303047565312 |