ORCID Profile
0000-0003-0014-5560
Current Organisations
The University of Auckland
,
Auckland War Memorial Museum
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Publisher: Wiley
Date: 13-09-0100
DOI: 10.1111/J.1529-8817.2011.01052.X
Abstract: The red algal order Bangiales has been revised as a result of detailed regional studies and the development of expert local knowledge of Bangiales floras, followed by collaborative global analyses based on wide taxon s ling and molecular analyses. Combined analyses of the nuclear SSU rRNA gene and the plastid RUBISCO LSU (rbcL) gene for 157 Bangiales taxa have been conducted. Fifteen genera of Bangiales, seven filamentous and eight foliose, are recognized. This classification includes five newly described and two resurrected genera. This revision constitutes a major change in understanding relationships and evolution in this order. The genus Porphyra is now restricted to five described species and a number of undescribed species. Other foliose taxa previously placed in Porphyra are now recognized to belong to the genera Boreophyllum gen. nov., Clymene gen. nov., Fuscifolium gen. nov., Lysithea gen. nov., Miuraea gen. nov., Pyropia, and Wildemania. Four of the seven filamentous genera recognized in our analyses already have generic names (Bangia, Dione, Minerva, and Pseudobangia), and are all currently monotypic. The unnamed filamentous genera are clearly composed of multiple species, and few of these species have names. Further research is required: the genus to which the marine taxon Bangia fuscopurpurea belongs is not known, and there are also a large number of species previously described as Porphyra for which nuclear SSU ribosomal RNA (nrSSU) or rbcL sequence data should be obtained so that they can be assigned to the appropriate genus.
Publisher: Informa UK Limited
Date: 12-2003
Publisher: Elsevier BV
Date: 03-2008
DOI: 10.1016/J.YMPEV.2007.12.016
Abstract: A number of molecular studies of the Corallinales, a calcified order of the red algae, have used the conservative nSSU gene to investigate relationships within the order. However interspecific variation at this locus is low for closely related species, limiting resolution of recently erged groups. In this study, we obtained psbA sequence data from specimens of the order from New Zealand that had been identified according to current taxonomic criteria. We compared phylogenetic analyses based on psbA with those based on nSSU for the same dataset, and also analysed nSSU sequences of the New Zealand material with nSSU sequences of Corallinales taxa from other parts of the world. Our study shows that psbA has considerable potential as a marker for this group, being easily lified and considerably more variable than nSSU. Combined analyses using both markers provide significant support for relationships at both distal and terminal nodes of the analysis. Our analysis supports the monophyly of all three families currently defined in Corallinales: the Sporolithaceae, Hapalidiaceae and Corallinaceae, and indicates cryptic speciation in Mesophyllum and Spongites.
Publisher: Wiley
Date: 06-01-2022
DOI: 10.1111/JPY.13227
Abstract: A multigene ( psb A, rbc L, 18S rDNA) molecular phylogeny of the genus Phymatolithon showed a polyphyletic grouping of two monophyletic clades within the Hapalidiales. DNA sequence data integrated with morpho‐anatomical comparisons of type material and of recently collected specimens were used to establish Phymatolithopsis gen. nov. with three species, P. prolixa comb. nov., the generitype, P. repanda comb. nov. and P. donghaensis sp. nov. Phymatolithopsis is sister to Mesophyllum and occurs in a clade distinct from Phymatolithon and boreal species currently assigned to Lithothamnion . Morpho‐anatomically, Phymatolithopsis is comprised of species that are non‐geniculate and encrusting, bear epithallial cells with rounded walls (not flared), subepithallial initials that are usually as short as or shorter than their immediate inward derivatives, conceptacle primordia from all stages forming superficially directly from subepithallial initials, mature carposporangial conceptacles with a discontinuous fusion cell, gonimoblast filaments that develop at the margins of the fusion cell around the periphery of the carposporangial conceptacle chambers, and multiporate tetra/bisporangial conceptacles. Phymatolithopsis can be distinguished from Phymatolithon by the origin of its conceptacle primordia, which are initiated superficially, directly from the layer of subepithallial initials below the epithallial cells and the distribution of gonimoblast filaments in carposporangial conceptacles, that are at the margins of the fusion cells.
Publisher: Wiley
Date: 25-04-2023
DOI: 10.1002/LNO.12345
Abstract: Coralline algae are an essential element of benthic ecosystems throughout the ocean's photic zone. Yet, the role of light in shaping the physiology of coralline algae from cold‐water, low‐light habitats is poorly understood. Here, we assess the calcification physiology of five cool temperate coralline algae in response to different irradiance levels over 3 months. We show that in contrast to current models focused on warmer water species, previously observed enhancement of calcification rates by photosynthesis is largely limited to lower irradiances, and that the removal of CO 2 from the calcifying fluid is not the underlying mechanism of this enhancement. Instead, this most likely occurs via two processes: (1) increased ion pumping rates to elevate the calcium carbonate saturation state in the calcifying fluid and (2) a higher daytime pH in the diffusion boundary layer that raises calcifying fluid pH. However, as irradiance increases, ion pumping becomes increasingly saturated limiting further enhancements. Our results also suggest the existence of two calcification strategies in coralline algae and indicate that magnesium incorporation is determined by the magnesium to calcium ratio in the calcifying fluid ([Mg] CF /[Ca] CF ). This study adds to our mechanistic understanding of calcification in coralline algae and fills in much needed knowledge about the role of light in controlling their physiology.
Publisher: Springer Science and Business Media LLC
Date: 25-04-2017
Publisher: Informa UK Limited
Date: 12-1999
Publisher: Springer Science and Business Media LLC
Date: 07-2011
DOI: 10.1038/475036A
Publisher: Springer Science and Business Media LLC
Date: 27-11-2014
Publisher: Informa UK Limited
Date: 05-09-2023
Publisher: Springer Science and Business Media LLC
Date: 05-12-2016
Publisher: CSIRO Publishing
Date: 2003
DOI: 10.1071/SB02025
Abstract: Extensive collections of Porphyra from throughout New Zealand since the early 1980s have revealed unexpectedly high ersity within the genus. From small-scale, opportunistic s ling of southern Australian Porphyra, small subunit ribosomal RNA gene (SSU) sequence data confirm the presence in Tasmania of a recently-described species of Porphyra, P. rakiura W.A.Nelson. This is the first report of P. rakiura from outside New Zealand. Analysis of rbcL–rbcS spacer DNA sequence from P. rakiura specimens and from an isotype specimen of P. lucasii Levring confirm that P. rakiura can be distinguished from the P. lucasii isotype at the molecular level as well as morphologically. A Western Australian specimen collected as P. lucasii provides a nuclear SSU sequence that is clearly different (92.1% similar) to that of P. rakiura, and rbcL–rbcS spacer sequence data identical to that of the P. lucasii isotype. Sequence data from the rbcL–rbcS spacer of a herbarium specimen from South Australia initially identified as P. lucasii, but with P. rakiura-like morphology, demonstrate that it is genetically distinct from P. rakiura and place it closer to, but not identical with, the P. lucasii isotype. This challenges the current taxonomic understanding of Porphyra in Australia, and of P. lucasii in particular.
Publisher: Informa UK Limited
Date: 05-2004
Publisher: Informa UK Limited
Date: 2013
Publisher: Springer Science and Business Media LLC
Date: 16-05-2014
Publisher: Elsevier BV
Date: 10-2014
Publisher: Wiley
Date: 2016
DOI: 10.1111/PRE.12113
Publisher: Public Library of Science (PLoS)
Date: 02-12-2019
Publisher: Informa UK Limited
Date: 05-2009
Publisher: Informa UK Limited
Date: 17-07-2023
Publisher: CSIRO Publishing
Date: 2010
DOI: 10.1071/SB09033
Abstract: The phylogenetic relationships of Porphyra collected from the Falkland Islands have been examined using molecular data from two loci, the plastid rbcL gene and the nuclear nSSU gene, in conjunction with morphological observations. Nine species have been distinguished, belonging to four distinct lineages within the Bangiales, differing from one another by 16–137 substitutions in the rbcL gene. One species is closely related to P. lissima, a north Atlantic taxon, three are resolved in a clade that includes several species from New Zealand, Australia and South Africa, as well as P. umbilicalis, whereas four others are more closely related to Southern Ocean species, including P. cinnamomea, P. virididentata and several as yet unnamed taxa from New Zealand, Australia and South Africa. Three species, one of which we identify as P. columbina, appear to be widely distributed in the Southern Ocean, with representatives on the Falkland Islands and on islands of the Australian and New Zealand subantarctic.
Publisher: Informa UK Limited
Date: 28-06-2018
Publisher: Elsevier BV
Date: 06-2004
Publisher: Wiley
Date: 19-08-2008
Publisher: Wiley
Date: 27-04-2015
DOI: 10.1111/JPY.12301
Abstract: The marine red algal family Liagoraceae sensu lato is shown to be polyphyletic based on analyses of a combined rbcL and psaA data set and the pattern of carposporophyte development. Fifteen of eighteen genera analyzed formed a monophyletic lineage that included the genus Liagora. Nemalion did not cluster with Liagoraceae sensu stricto, and Nemaliaceae is reinstated, characterized morphologically by the formation of the primary gonimolobes by longitudinal isions of the gonimoblast initial. Yamadaella and Liagoropsis, previously placed in the Dermonemataceae, are shown to be independent lineages and are recognized as two new families Yamadaellaceae and Liagoropsidaceae. Yamadaellaceae is characterized by two gonimoblast initials cut off bilaterally from the fertilized carpogonium and diffusely spreading gonimoblast filaments. Liagoropsidaceae is characterized by at least three gonimoblast initials cut off by longitudinal septa from the fertilized carpogonium. In contrast, Liagoraceae sensu stricto is characterized by a single gonimoblast initial cut off transversely or diagonally from the fertilized carpogonium. Reproductive features, such as diffuse gonimoblasts and unfused carpogonial branches following postfertilization, appear to have evolved on more than one occasion in the Nemaliales and are therefore not taxonomically diagnostic at the family level, although they may be useful in recognizing genera.
Publisher: Wiley
Date: 05-04-2021
DOI: 10.1111/JPY.13115
Abstract: The coralline algal genus Corallinapetra is currently monospecific and was established on the species Corallinapetra novaezelandiae , known from a single collection from north‐eastern New Zealand. On the basis of multi‐gene phylogenetic analyses, Corallinapetra has been resolved apart from all currently recognized families and orders within the Corallinophycidae. We analyzed DNA sequence data from the holotype of Lithothamnion gabrielii , which has been considered a heterotypic synonym of L. muelleri , and an unidentified s le collected from Stewart Island in New Zealand, using psb A, rbc L, and COI‐5P genes. We also observed detailed morpho‐anatomical characters with light and scanning electron microscopy. Our phylogenetic analyses showed that L. gabrielii and the s le from New Zealand belonged to the same clade as Corallinapetra , distinct from other families and orders in the Corallinophycidae. Members of this clade are distinguishable from other families and orders in the Corallinophycidae by possessing sporangia that are surrounded by remnant sterile filaments that are weakly calcified in mature multiporate sporangial conceptacles that produce zonately ided tetrasporangia. Therefore, we propose that Corallinapetra be placed in its own family, Corallinapetraceae and order, Corallinapetrales, and that L. gabrielii should be assigned to Corallinapetra , as C. gabrielii , to reflect their phylogenetic relationships. We also obtained a partial rbc L sequence data from the lectotype of L. muelleri , the generitype of Lithothamnion . Comparison of the L. muelleri type sequence with L. gabrielii unambiguously demonstrated that these two species are not conspecific, and confirm the placement of L. muelleri within the Hapalidiales.
Publisher: Wiley
Date: 04-05-2023
DOI: 10.1111/JPY.13336
Abstract: Introduced seaweeds and undescribed species often remain undetected because marine regional floras are as yet poorly understood. DNA sequencing facilitates their detection, but databases are incomplete, so their improvement will continue to lead the discovery of these species. Here we aim to clarify the taxonomy of two turf‐forming red algal Australian species that morphologically resemble the European Aphanocladia stichidiosa . We also aim to elucidate whether either of these species could have been introduced in Europe or Australia. We studied their morphology, analyzed 17 rbc L sequences of European and Australian specimens, examined their generic assignment using a phylogeny based on 24 plastid genomes, and investigated their biogeography using a taxon‐rich phylogeny including 52 rbc L sequences of species in the Pterosiphonieae. The rbc L sequences of one of the Australian species were identical to A. stichidiosa from Europe, considerably expanding its known distribution. Unexpectedly, our phylogenetic analyses resolved this species in the Lophurella clade rather than in Aphanocladia and the new combination L. stichidiosa is proposed. The other Australian species is described as L. pseudocorticata sp. nov. Although L. stichidiosa was originally described in the Mediterranean ca. 70 years ago, our phylogenetic analyses placed it in a lineage restricted to the southern hemisphere, showing that it is native to Australia and introduced to Europe. This study confirms that further work using molecular tools is needed to characterize seaweed ersity, especially among the poorly explored algal turfs, and showcases the usefulness of phylogenetic approaches to uncover introduced species and to determine their native ranges.
Publisher: Elsevier BV
Date: 2001
Publisher: Wiley
Date: 27-03-2015
DOI: 10.1111/JPY.12288
Abstract: Coralline red algae from the New Zealand region were investigated in a study focused on documenting regional ersity. We present a multi-gene analysis using sequence data obtained for four genes (nSSU, psaA, psbA, rbcL) from 68 s les. The study revealed cryptic ersity at both genus and species levels, confirming and providing further evidence of problems with current taxonomic concepts in the Corallinophycidae. In addition, a new genus Corallinapetra novaezelandiae gen. et sp. nov. is erected for material from northern New Zealand. Corallinapetra is excluded from all currently recognized families and orders within the Corallinophycidae and thus represents a previously unrecognized lineage within this subclass. We discuss rank in the Corallinophycidae and propose the order Hapalidiales.
Publisher: Informa UK Limited
Date: 14-10-2020
Publisher: Informa UK Limited
Date: 07-03-2019
Publisher: Informa UK Limited
Date: 25-09-2017
No related grants have been discovered for wendy nelson.