Topic
Fuscospora
About: Fuscospora is a research topic. Over the lifetime, 27 publications have been published within this topic receiving 522 citations.
Papers
TL;DR: The molecular approach strongly supports fossil-based estimates that Nothofagus diverged from the rest of Fagales more than 84 Myr ago, and the mid-Cenozoic estimate for the diversification of the four extant subgenera conflicts with the palynological interpretation.
Abstract: This study uses a molecular-dating approach to test hypotheses about the biogeography of Nothofagus. The molecular modelling suggests that the present-day subgenera and species date from a radiation that most likely commenced between 55 and 40 Myr ago. This rules out the possibility of a reconciled all-vicariance hypothesis for the biogeography of extant Nothofagus. However, the molecular dates for divergences between Australasian and South American taxa are consistent with the rifting of Australia and South America from Antarctica. The molecular dates further suggest a dispersal of subgenera Lophozonia and Fuscospora between Australia and New Zealand after the onset of the Antarctic Circumpolar Current and west wind drift. It appears likely that the New Caledonian lineage of subgenus Brassospora diverged from the New Guinean lineage elsewhere, prior to colonizing New Caledonia. The molecular approach strongly supports fossil-based estimates that Nothofagus diverged from the rest of Fagales more than 84 Myr ago. However, the mid-Cenozoic estimate for the diversification of the four extant subgenera conflicts with the palynological interpretation because pollen fossils, attributed to all four extant subgenera, were widespread across the Weddellian province of Gondwana about 71 Myr ago. The discrepancy between the pollen and molecular dates exists even when confidence intervals from several sources of error are taken into account. In contrast, the molecular age estimates are consistent with macrofossil dates. The incongruence between pollen fossils and molecular dates could be resolved if the early pollen types represent extinct lineages, with similar types later evolving independently in the extant lineages.
186 citations
TL;DR: A new phylogenetic analysis of morphological characters is presented and it is argued that these morphological and molecular differences are sufficient for the four clades of Nothofagaceae to be recognised at the primary rank of genus, and that this classification will be more informative and efficient than the currently circumscribed Noth ofagus with four subgenera.
Abstract: The generic taxonomy of the Nothofagaceae is revised. We present a new phylogenetic analysis of morphological characters and map these characters onto a recently published phylogenetic tree obtained from DNA sequence data. Results of these and previous analyses strongly support the monophyly of four clades of Nothofagaceae that are currently treated as subgenera of Nothofagus . The four clades of Nothofagaceae are robust and well-supported, with deep stem divergences, have evolutionary equivalence with other genera of Fagales, and can be circumscribed with morphological characters. We argue that these morphological and molecular differences are sufficient for the four clades of Nothofagaceae to be recognised at the primary rank of genus, and that this classification will be more informative and efficient than the currently circumscribed Nothofagus with four subgenera. Nothofagus is recircumscribed to include five species from southern South America, Lophozonia and Trisyngyne are reinstated, and the new genus Fuscospora is described. Fuscospora and Lophozonia , with six and seven species respectively, occur in New Zealand, southern South America and Australia. Trisyngyne comprises 25 species from New Caledonia, Papua New Guinea and Indonesia. New combinations are provided where necessary in each of these genera.
122 citations
TL;DR: The flora at Berwick Quarry contains species which are consistent with rainforest in the region, however, the flora is also notable for the presence of leaves of Eucalyptus, leaving little doubt that the flora represents a mixture of rainforest and open forest taxa.
Abstract: The Late Oligocene to possibly earliest Early Miocene Benvick Quany macrofossil flora was first described very early in this century by Henry Deane, but has since been largely ignored. Recent work at the quarry has led to major new collections and a reinvestigation of the flora. Seventeen taxa of macrofossils have been recovered, including Agathis, Dacrycarpus, four species of Lauraceae, Gymnostoma, Nothofagus, Eucalyptus, an indeterminate Myrtaceae and Proteaceae, three possible Cunoniaceae, and six unidentified taxa. Fagus maideni Deane is formally transferred to Nothofagus Blume. Nothofagus johnstoni Hill, Fagus luemanni Deane, and Atherosperma berwickense Deane, are considered to be junior synonyms of the species N. maideni (Deane) comb. nov. Only one of the seven fossil species of Eucalyptus established by Deane can be recognised in our material: E kitsoni Deane. His Lomatia species are probably Cunoniaceae. The Berwick Quarry flora contains species which are consistent with rainforest in the region, however, the flora is also notable for the presence of leaves of Eucalyptus, leaving little doubt that the flora at Berwick Quarry represents a mixture of rainforest and open forest taxa. The vegetation was probably a mosaic of open and closed forest, representing some of the earliest evidence for seasonality in Australia during the development of the modem flora. Palynological samples are dominated by Nothofagus subgenus Brassospora and Fuscospora.
55 citations
TL;DR: Forty-two flavonoids and a stilbene (pinosylvin) were identified in the leaf exudates of 11 temperate species of Nothofagus from South America, Australia and New Zealand and demonstrate significant taxonomic value at the subgeneric level.
26 citations
TL;DR: In this paper, the pollen and spores from surface samples consisting of moss polsters and soils collected from 15 sites in Northland and Rangitoto Island were analysed, and sample sites were chosen to be representative of differing plant communities in the Northland region.
Abstract: The pollen and spores from surface samples consisting of moss polsters and soils collected from 15 sites in Northland and Rangitoto Island were analysed. Sample sites were chosen to be representative of differing plant communities in the Northland region. Major plant communities could be distinguished by their characteristic pollen spectra but minor associations were difficult to distinguish. Gymnosperms (anemophilous) are generally proportionately or over‐represented compared with zoophi‐lous taxa. A notable exception to this is Agathis australis which is typically grossly under‐represented. Angiosperm elements of Northland forests are generally very poorly represented, the exception being Metrosideros spp. which are either well or over‐represented. In contrast to reports from other parts of New Zealand, moderate to high values (>5%) of Nothofagus subgenus Fuscospora pollen in Northland spectra suggest local presence. Poaceae pollen records only low frequencies in forest spectra, but dominates g...
19 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 2 |
| 2020 | 2 |
| 2018 | 2 |
| 2015 | 1 |
| 2014 | 2 |
| 2013 | 1 |