A5036520455- Polar Research and Ecology
- Diatoms and Algae Research
- Microbial Community Ecology and Physiology
- Marine and coastal plant biology
- Algal biology and biofuel production
- Geology and Paleoclimatology Research
- Marine and coastal ecosystems
- Protist diversity and phylogeny
- Aquatic Ecosystems and Phytoplankton Dynamics
- Lichen and fungal ecology
- Cryospheric studies and observations
- Environmental DNA in Biodiversity Studies
- Freshwater macroinvertebrate diversity and ecology
- Marine Biology and Ecology Research
- Isotope Analysis in Ecology
- Microbial Fuel Cells and Bioremediation
- Aquatic Invertebrate Ecology and Behavior
- Plant Pathogens and Fungal Diseases
- Plant Diversity and Evolution
- Climate change and permafrost
- Biocrusts and Microbial Ecology
- Genomics and Phylogenetic Studies
- Coastal wetland ecosystem dynamics
- Mine drainage and remediation techniques
- Photosynthetic Processes and Mechanisms
Manaaki Whenua – Landcare Research
2015-2025
Cadre Research
2005-2023
University of Canterbury
2002-2011
The nature of heterotachy at the center recent controversy over relative performance tree-building methods is different from form that has been inferred in empirical studies. latter have suggested proportions variable sites (pvar) vary among orthologues and paralogues. However, strength this inference, describing what may be one most important evolutionary properties sequence data, remained weak. Consequently, other models evolution proposed to explain some long-branch attraction (LBA)...
The phylogenetic branching order of the green algal groups that gave rise to land plants remains uncertain despite its fundamental importance understanding plant evolution. Previous studies have demonstrated evolved from streptophyte algae, but different lineages streptophytes been suggested be sister group plants. To better understand evolutionary history and determine potential effects "long-branch attraction" in reconstruction, we analyzed a chloroplast genome data set including three new...
Abstract Nostoc commune Vaucher (a cyanobacterium) is a very conspicuous terrestrial primary producer in Victoria Land, continental Antarctica. Because polar ecosystems are considered to be especially sensitive environmental changes, understanding the constraints on net carbon (C) fixation by N. necessary determine effects of changes ecological functioning ice‐free areas continent. A model describing C populations an Antarctic dry valley was constructed using field and laboratory...
Conventional microbial fuel cells (MFCs) consist of biological anodes and abiotic cathodes separated by a proton-exchange membrane. The cathode usually catalyses the reduction oxygen to produce water means expensive catalysts such as platinum.Footnote1 cathodic reaction is often limiting in MFCs researchers are now focusing on efficient, low-cost improve at cathode. This paper describes photosynthetic biocathode sediment-type MFC constructed without carbon stainless steel did not contain any...
Summary The extremely cold and arid Antarctic dry valleys are one of the most environmentally harsh terrestrial ecosystems supporting organisms in which biogeochemical transformations carbon exclusively driven by microorganisms. natural abundance 13 C 15 N source organic materials soils have been examined to obtain evidence for provenance soil matter loss as CO 2 during extended incubation (approximately 1200 days at 10°C under moist conditions) has used determine potential decay C. remote...
Four new species, Bracteacoccus ruber, Chlamydomonas palmellomoewusii, Elliptochloris philistinensis and Schizochlamydella orbicularis, three monospecific genera, Cryptodesmus ellipsoideus, Achoma brachiatum, Variochloris pyrenoglobularis, are described from cultured material isolated alpine herbfield soil of Mt Philistine, New Zealand. genetic information is also reported for Pseudococcomyxa simplex, which was the site previously.
Trebouxiophytes of the genus Prasiola are well known in Antarctica, where they among most important primary producers. Although many aspects their biology have been thoroughly investigated, scarcity molecular data has so far prevented an accurate assessment taxonomy and phylogenetic position. Using sequences chloroplast genes rbcL psaB, we demonstrate existence three cryptic species that were previously confused under crispa (Lightfoot) Kützing. Genuine P. occurs Antarctica; its presence was...
SUMMARY The microalga Haematococcus lacustris is a source of astaxanthin used widely in aquaculture, pharmaceutical, and cosmetic industries. A new strain (LCR‐26C‐1f) isolated from the New Zealand alpine zone was evaluated this study. influence vitamins, micronutrients, various carbon nitrogen sources were investigated to maximize biomass production batch cultures using shake flasks. Supplementation vitamins consisting thiamine, biotin, cyanocobalamin improved cell density by 40% over...
The modern concept of the genus Chloromonas includes a subclade species found exclusively in snow. We describe (Cr.) fuhrii sp. nov., new member this clade, which is closely related to Cr. muramotoi from Japan. characterised by absence stigma, pyrenoid, and defined papilla, ready loss flagella culture, single lobed chloroplast. Strains have been sourced green, orange, pink/red has Svalbard, Antarctica, New Zealand, with most genetic variation occurring Svalbard. minimal present Zealand...
Spirogyra is an extremely common, high-biomass, and species-rich green alga of freshwater ecosystems. Conjugating material with zygospores traditionally required to achieve identification beyond genus. Although filament width classes have been related habitat status elsewhere, the phylogenetic content these unknown. We report results a survey 90 sites in New Zealand, designed determine species distributions contrasting stream habitats, using rbcL sequencing microscopically separated...
AbstractP.M. Novis. 2006. Taxonomy of Klebsormidium (Klebsormidiales, Charophyceae) in New Zealand streams and the significance low-pH habitats. Phycologia 45: 293–301. DOI: 10.2216/04-70.1A new species, acidophilum, is proposed to accommodate a newly described organism isolated from strongly acidic (pH <3.0) mine-contaminated on west coast South Island, Zealand. This differs dissectum, pH-neutral habitats, according filament diameter morphological response pH manipulation culture....
The quadriflagellate snow alga Chlainomonas Christen, distributed in New Zealand and North America, has several unusual structural attributes. A process assumed to be cytokinesis involves extrusion of protoplasm from the parent through a narrow canal, C. kolii (J. T. Hardy et Curl) Hoham produces net‐like outer envelope rather than cell wall, flagellar basal apparatus consists two semi‐independent pairs bodies. Structural connections between body appear minimal, but connecting system...
Abstract The quadriflagellate genus Chlainomonas frequently dominates red snow globally. It is unusual in several respects, with two separated pairs of flagella, apparent cell division via extrusion cytoplasmic threads, and being nested phylogenetically within the biflagellate Chloromonas . Here, we showed that austral species (Cr.) rubroleosa , originally described from Antarctic snow, a close relative challenging monophyly as currently conceived. Sequences 18S rRNA gene robustly linked Cr....
Microscopy, DNA sequencing, and amplified fragment length polymorphism (AFLP) were used to examine variation within Nostoc commune from collections between 72 78°S in Victoria Land, Antarctica. Although there is considerable bias of collected material towards southern latitudes, this varies greatly age (collected 1984 2004), an important new phylogeographic pattern was found. sequencing the tRNA leu (UAA) region, recently define form species N. , revealed little collections. AFLP analysis,...
The systematics of the green algal class Ulvophyceae have been difficult to resolve with ultrastructural and molecular phylogenetic analyses. Therefore, we investigated relationships among ulvophycean orders by determining distribution two discrete genetic characters previously identified only in order Dasycladales. First, Acetabularia acetabulum uses core translation GTPase Elongation Factor 1alpha (EF-1alpha) while most Chlorophyta instead possess related Factor-Like (EFL). Second, nuclear...