<i>Ceratocephalus pungens</i>(Ranunculaceae): A new species from New Zealand

Garnock‐Jones, P. J.

doi:10.1080/0028825x.1984.10425240

Cited by 10 publications

(3 citation statements)

References 5 publications

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“…The distinctive morphological characters of both Ceratocephala and Myosurus support their segregation from Ranunculus. The achenes of Ceratocephala have inflated empty chambers on either sides, an elongated beak, except one endemic species in New Zealand (Garnock-Jones, 1984), and a base chromosome number x = 7, which has been reported in only some species of Ranunculus. The karyotype of Ceratocephala, however, is different from these species (Goepfert, 1974).…”

Section: Discussionmentioning

confidence: 91%

A molecular phylogeny, morphology and classification of genera of Ranunculeae (Ranunculaceae)

Emadzade

Lehnebach

Lockhart

et al. 2010

TAXON

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Ranunculeae represent a highly diverse and cosmopolitan tribe within Ranunculaceae. Because of the great diversity of morphological features and lack of molecular phylogeny for the tribe, the classification of its genera has always been controversial. We report here molecular phylogenetic analyses based on nuclear and plastid markers (nrITS, matK, trnK, psbJ-petA) that provide a framework for understanding relationships and character evolution within the tribe. Maximum parsimony analyses suggest a weakly supported basal dichotomy, while Neighbor Net analysis indicates strong support for five distinct lineages. Both methods revealed several well-supported, small terminal clades which correspond to previously described genera, characterised by unique morphological features and character combinations. Anatomical structures of the achenes suggested relationships with greatest concordance to those in the molecular phylogeny. Macroscopic analysis of achene morphology often indicated parallel evolution of structures related to certain dispersal mechanisms. Characters of perianth, androecium, gynoeceum and pollen are highly homoplasious, but several features characteristic of small terminal clades and terminal branches can be observed. Geographic isolation and adaptions may have triggered the evolution of morphological characters. We conclude that a classification accepting several small genera (Arcteranthis, and a large genus Ranunculus s.str. (including Batrachium, Aphanostemma and Gampsoceras) reflects best the molecular phylogeny and morphological diversity of the tribe.

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Section: Discussionmentioning

confidence: 91%

A molecular phylogeny, morphology and classification of genera of Ranunculeae (Ranunculaceae)

Emadzade

Lehnebach

Lockhart

et al. 2010

TAXON

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“…We cannot infer from our data whether the ancestors of these genera had already arrived in the Southern Hemisphere or whether this migration happened within genera. Nevertheless, according to the age of node 5 (early Miocene), the occurrence of some species of Myosurus and Ceratocephala endemic to New Zealand (Garnock‐Jones, 1984; Fig. 1b, f) is explained by LDD or by island‐hopping via New Guinea and Australia (Fig.…”

Section: Discussionmentioning

confidence: 99%

Northern Hemisphere origin, transoceanic dispersal, and diversification of Ranunculeae DC. (Ranunculaceae) in the Cenozoic

Emadzade

Hörandl

2010

Journal of Biogeography

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Aim The role of dispersal versus vicariance for plant distribution patterns has long been disputed. We study the temporal and spatial diversification of Ranunculeae, an almost cosmopolitan tribe comprising 19 genera, to understand the processes that have resulted in the present inter‐continental disjunctions. Location All continents (except Antarctica). Methods Based on phylogenetic analyses of nuclear and chloroplast DNA sequences for 18 genera and 89 species, we develop a temporal–spatial framework for the reconstruction of the biogeographical history of Ranunculeae. To estimate divergence dates, Bayesian uncorrelated rates analyses and four calibration points derived from geological, fossil and external molecular information were applied. Parsimony‐based methods for dispersal–vicariance analysis (diva and Mesquite) and a maximum likelihood‐based method (Lagrange) were used for reconstructing ancestral areas. Six areas corresponding to continents were delimited. Results The reconstruction of ancestral areas is congruent in the diva and maximum likelihood‐based analyses for most nodes, but Mesquite reveals equivocal results at deep nodes. Our study suggests a Northern Hemisphere origin for the Ranunculeae in the Eocene and a weakly supported vicariance event between North America and Eurasia. The Eurasian clade diversified between the early Oligocene and the late Miocene, with at least three independent migrations to the Southern Hemisphere. The North American clade diversified in the Miocene and dispersed later to Eurasia, South America and Africa. Main conclusions Ranunculeae diversified between the late Eocene and the late Miocene. During this time period, the main oceanic barriers already existed between continents and thus dispersal is the most likely explanation for the current distribution of the tribe. In the Southern Hemisphere, a vicariance model related to the break‐up of Gondwana is clearly rejected. Dispersals between continents could have occurred via migration over land bridges, such as the Bering Land Bridge, or via long‐distance dispersal.

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“…Two native annual species (Ceratocephalus pungens and Myosurus minimus subsp. novae-zelandiae; Garnock-Jones 1984, 1986Webb et al 1988) were recorded at low abundance at a few localities on Flat Top Hill in the spring only. Houle & Phillips (1989) reported greater seasonal turnover of species (i.e., changes in species presence) on drought-prone, shallow soils than on deeper soils on granite outcrops, and abundance shifts, rather than species turnover, on deeper soils.…”

Section: Seasonal Changesmentioning

confidence: 98%

Seasonal changes in semi‐arid vegetation of Central Otago, New Zealand

Walker

Wilson

Mark

1999

New Zealand Journal of Botany

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Seasonal changes in the semi-arid grassland vegetation of Central Otago, New Zealand, are examined using data collected in nine pairs of spring and autumn sampling dates at five long-term plots, and data from consecutive autumn, spring, and summer surveys across an environmental gradient. Seasonal changes are small in relation to those occurring in the vegetation from year to year, and to spatial differences in vegetation across the landscape. Seasonal changes in community characteristics and in the abundance of most species differ between years. Climatic control of seasonal change appears to be complex and site-specific. Greater seasonal variation, in both species presence and species abundance, is found in shady sites and on deeper soils. Spring vegetation tends to be more variable and less well structured than autumn vegetation. It is suggested that the annual soil moisture cycle of winter recharge and summer depletion leads to a random element in the spring vegetation (i.e., the relatively widespread germination of distributed seed under temporarily favourable climatic conditions) and that, by autumn, species are more strongly confined to particular environments according to their tolerance of moisture stress.

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Ceratocephalus pungens(Ranunculaceae): A new species from New Zealand

Cited by 10 publications

References 5 publications

A molecular phylogeny, morphology and classification of genera of Ranunculeae (Ranunculaceae)

A molecular phylogeny, morphology and classification of genera of Ranunculeae (Ranunculaceae)

Northern Hemisphere origin, transoceanic dispersal, and diversification of Ranunculeae DC. (Ranunculaceae) in the Cenozoic

Seasonal changes in semi‐arid vegetation of Central Otago, New Zealand

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