Vegetation changes and their climatic implication for the late Pleistocene at Lake Poukawa, Hawkes Bay, New Zealand

Okuda, M., Shulmeister, J and Flenley, J. R. (2002) Vegetation changes and their climatic implication for the late Pleistocene at Lake Poukawa, Hawkes Bay, New Zealand. Global and Planetary Change, 33 3-4: 269-282. doi:10.1016/S0921-8181(02)00082-6


Author Okuda, M.
Shulmeister, J
Flenley, J. R.
Title Vegetation changes and their climatic implication for the late Pleistocene at Lake Poukawa, Hawkes Bay, New Zealand
Journal name Global and Planetary Change   Check publisher's open access policy
ISSN 0921-8181
1872-6364
Publication date 2002-07-01
Year available 2002
Sub-type Article (original research)
DOI 10.1016/S0921-8181(02)00082-6
Open Access Status Not yet assessed
Volume 33
Issue 3-4
Start page 269
End page 282
Total pages 14
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Formatted abstract
A detailed vegetation history extending back to the Last Interglacial (Marine Isotope Substage 5e) is presented for Lake Poukawa, Hawkes Bay, New Zealand. This history is based on palynological analyses of a 198-m core record, age secured by uranium/thorium (U/Th) and optically stimulated luminescence (OSL) dates as well as tephrochronology. Vegetation of the penultimate glacial (Isotope Stage 6) probably consisted of a very sparse shrubby herbland of stunted podocarps (Phyllocladus sp.), daisies, grasses and sedges. Similar floras existed in each of the succeeding cool periods. Four interglacial/interstadial floras are preserved. The peak of the Last Interglacial (Substage 5e) was dominated by extensive lowland forest of tall forest podocarps (Podocarpus/Prumnopitys), most probably matai (Prumnopitys taxifolia) with red beech (Nothofagus fusca), secondary forest trees (Coprosma spp., Myrsine spp.) and tree ferns (Cyathea spp.). In the Poukawa basin itself, a swamp forest of the podocarp (Dacrycarpus dacrydioides) with the true palm (Rhopalostylis sapida) expanded. Substage 5e was significantly warmer and/or moister than the present day. Substage 5c/5a was marked by montane forest of red and silver beeches (N. fusca and N. menziesii), Phyllocladus spp. and secondary trees. A reduced representation of Podocarpus/Prumnopitys possibly consists of montane podocarp (Podocarpus hallii). We infer the temperature of Substage 5c/5a to have been 3.5-5°C lower than the present day. Although Stage 3 flora are superficially similar to those of Substage 5c/5a, the beeches are relatively less dominant. The regional flora during Stage 1 is very similar to those of Substage 5e, but the density is lower with no swamp forest during the present interglaciation. This may represent a change in evapotranspiration balance around Poukawa, but may also be controlled by hydrological conditions within the basin.
Keyword MIS 5
New Zealand
Palynology
Pollen concentration
The last glacial
Vegetation history
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Geography, Planning and Environmental Management Publications
 
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