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Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems
RESEARCH ARTICLE

Phytogeography and climate analysis of Nothofagus subgenus Brassospora in New Guinea and New Caledonia

Jennifer Read A D , Geoffrey S. Hope B and Robert S. Hill C
+ Author Affiliations
- Author Affiliations

A School of Biological Sciences, Monash University, Vic. 3800, Australia.

B Department of Archaeology and Natural History, Research School of Pacific and Asian Studies, Australian National University, Canberra, ACT 0200, Australia.

C School of Earth and Environmental Sciences, University of Adelaide, Adelaide, SA 5005, and South Australian Museum, North Terrace, Adelaide, SA 5000, Australia.

D Corresponding author. Email: jenny.read@sci.monash.edu.au

Australian Journal of Botany 53(4) 297-312 https://doi.org/10.1071/BT04155
Submitted: 30 September 2004  Accepted: 15 February 2005   Published: 24 June 2005

Abstract

Nothofagus subgenus Brassospora now occurs only in New Guinea and New Caledonia, but is well known from fossil deposits of South America, New Zealand, Antarctica and Australia. It is commonly used for palaeoclimatic interpretation, but the climate characteristics of the extant species have not been described. In this paper we used the climatic estimation software, BIOCLIM, to derive a climate profile of 24 variables for each of the 14 species of Nothofagus native to New Guinea, and lapse rates and isohyet maps to describe the annual mean temperature and rainfall range of the five species native to New Caledonia. The New Guinea species occur at annual mean temperatures ranging from 10.6 to 23.5°C, with annual precipitation of 1762–7733 mm. The first three axes of a principal components analysis explained 85% of the total variation, the first axis comprising temperature variables, the second comprising precipitation range and precipitation of the wet season, and the third axis comprising dry-season precipitation and annual and diurnal temperature range. Some species had distinct combinations of positions along these component axes, indicating clear niche differentiation with respect to climate. The New Caledonian species occur at annual mean temperatures of 14.5–23.5°C, and annual precipitation of c. 1500–3500 mm. Although there was no significant difference in annual mean temperature and precipitation between the New Guinea and New Caledonian species, comparison of median values across species suggests specialisation of most New Caledonian species towards slightly drier conditions than the New Guinea species that occur at similarly high annual mean temperatures. Use of subgenus Brassospora to interpret palaeoclimates should take into account the variation in climate experienced across the range of extant species.


Acknowledgments

We gratefully acknowledge the assistance provided by staff at the Lae Herbarium (Papua New Guinea Department of Forests), the National Research Institute of Papua New Guinea for permission to undertake research in Papua New Guinea, the staff of the Herbarium of IRD, Institut de Recherche pour le Développement, Centre de Nouméa, New Caledonia. We thank Henry Nix (Centre for Resource and Environmental Studies, ANU) for his inputs to this study. This research has been funded with the support of the Australian Research Council.


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Appendix 1  (a) Precipitation and (b) temperature profiles of New Guinean species
Acronyms are explained and units given in Table 2. Values are means ± standard deviations, with ranges in parentheses
A1



Appendix 2.  Sorting of New Guinean species according to component scores, with climate summaries derived from PCA and Appendix 1
Only climate variables contributing strongly to each component are considered
A2



Appendix 3.  Summary of estimated annual mean temperature and annual precipitation experienced by New Caledonian Nothofagus species
The values are means with standard deviations; range is given in parentheses
A3