A5083389575- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Pleistocene-Era Hominins and Archaeology
- Environmental DNA in Biodiversity Studies
- Geological formations and processes
- Microbial Community Ecology and Physiology
- Pacific and Southeast Asian Studies
- Soil and Water Nutrient Dynamics
- Archaeology and ancient environmental studies
- Tree-ring climate responses
- Protist diversity and phylogeny
- Aquatic Ecosystems and Phytoplankton Dynamics
- Peatlands and Wetlands Ecology
- Water Quality and Pollution Assessment
- Geological and Geochemical Analysis
- Fish Ecology and Management Studies
- Coastal wetland ecosystem dynamics
- Geophysics and Gravity Measurements
- Aquatic Invertebrate Ecology and Behavior
- Marine animal studies overview
- Freshwater macroinvertebrate diversity and ecology
- Lichen and fungal ecology
- Indigenous Studies and Ecology
- Geological and Geophysical Studies
- Scientific Research and Discoveries
Victoria University of Wellington
2015-2024
University of Otago
2023
University of New Brunswick
2008-2015
A comprehensive database of paleoclimate records is needed to place recent warming into the longer-term context natural climate variability. We present a global compilation quality-controlled, published, temperature-sensitive proxy extending back 12,000 years through Holocene. Data were compiled from 679 sites where time series cover at least 4000 years, are resolved sub-millennial scale (median spacing 400 or finer) and have one age control point every 3000 with cut-off values slackened in...
ABSTRACT Lake surface sediments are dominated by microorganisms that play significant roles in biogeochemical cycling within lakes. There is limited knowledge on the relative importance of local environmental factors and altitude bacterial microeukaryotic community richness composition lake sediments. In present study, sediment samples were collected from 40 lakes along an gradient (2–1215 m). Microbial communities characterized using 16S (bacteria) 18S (microeukaryotes) rRNA gene...
Abstract The frequency and intensity of cyanobacterial blooms is increasing worldwide. Multiple factors are implicated, most which anthropogenic. New Zealand provides a useful location to study the impacts human settlement on lake ecosystems. first humans (Polynesians) arrived about 750 years ago. Following their settlement, there were marked landscape modifications intensified after European 150 aims this reconstruct communities in six lakes over last 1000 explore key drivers change....
Abstract. Although analyses of tephra-derived glass shards have been undertaken in New Zealand for nearly four decades (pioneered by Paul Froggatt), our study is the first to systematically develop a formal, comprehensive, open-access reference dataset glass-shard compositions tephras. These data will provide an important tool future studies identify and correlate tephra deposits associated petrological magma-related within beyond. Here we present foundation TephraNZ, selected Zealand....
ABSTRACT Despite wide‐ranging interest in the vegetation and climate of Northland, New Zealand, during last glacial cycle, region timeframe lack quantitative reconstructions while land‐based pollen records have tended to be poorly dated fragmentary. The is also important for geochronology due co‐occurrence Rotoehu tephra, a widely dispersed isochron near current limits radiocarbon dating, extensive subfossil wood remains Agathis australis , with strong dendrochronological...
Lake sediments are natural archives that accumulate information on biological communities and their surrounding catchments. Paleolimnology has traditionally focussed identifying fossilized organisms to reconstruct past environments. In the last decade, application of molecular methodologies increased in paleolimnological studies, but further research investigating factors such as sample heterogeneity DNA degradation required. present study we investigated bacterial community (16S rRNA...
ABSTRACT Branched glycerol dialkyl tetraethers (brGDGTs) were abundant in surface sediments of freshwater lakes and catchment soils at altitudes from 10 to 2020 m New Zealand. Significant differences brGDGT compositions between lake indicate sources separate microbial habitats. An expanded modern calibration dataset comprising 33 has enabled a revised function for determining past ean nnual air t emperature (MAT) brGDGTs Zealand sediments: MAT (°C) = −31.664 × MBT + 16.252 ( n 30). The uses...
Lake sediments accumulate information on biological communities thus acting as natural archives. Traditionally paleolimnology has focussed fossilized remains of organisms, however, many organisms do not leave fossil evidence, meaning major ecosystem components are missing from environmental reconstructions. Many studies now incorporate molecular methods, including investigating microbial using DNA (eDNA), but there is uncertainty about the contribution living to inventories. In present...
Abstract Environmental DNA provides an opportunity to track long‐term changes in biological communities lake ecosystems but the detection of macroorganisms, such as freshwater fish and mussels, sedimentary (sedDNA) has only been successfully reported a few studies date. Factors low abundance target organisms, sampling location, molecular approach used, quantity may influence detection, though exploring these factors are lacking. In present study, sediment cores were collected from depocenter...
Regional vegetation, climate history, and local water table fluctuations for the past 14,600 years are reconstructed from pollen charcoal records of an ombrogenous peatbog in northern New Zealand (38°S). A long-term warming trend between 10,000 cal. yr BP is punctuated by two brief plateaux 14,200–13,800 13,500–12,000 BP. Periods relatively drier conditions inferred 14,000–13,400 12,000–10,000 BP, while a wet period observed 6000 The last 7000 feature stable temperatures, drying that...
Summary 1. Tyler’s Line delimits two distinct limnological provinces that reflect differences in climate, geology and vegetation Tasmania. Lakes west of are typically acidic dystrophic with relatively shallow euphotic zones, whereas eastern lakes circumneutral oligotrophic or ultra‐oligotrophic, allowing deeper penetration light. Consequently, defines a boundary where species assemblages change over short distance. 2. A survey 48 Tasmanian was undertaken to identify indicator taxa the...
A new multi-proxy paleo database for lake ecosystem and catchment change in Aotearoa New Zealand (ANZ) points to the potential resource service roles of Typha orientalis (raupō). In context chronic wetland degradation over past century, this iconic yet enigmatic plant can be viewed, alternately, as an invasive threat; a valuable cultural economic resource; natural, indigenous agent bioremediation. Our investigation reconstructs history raupō ~1000 years, based on 92 pollen records generated...