A5043664542- Marine and coastal ecosystems
- Hydrology and Watershed Management Studies
- Diatoms and Algae Research
- Marine Biology and Ecology Research
- Flood Risk Assessment and Management
- Aquatic Ecosystems and Phytoplankton Dynamics
- Mycotoxins in Agriculture and Food
- Ocean Acidification Effects and Responses
- Plant Pathogens and Fungal Diseases
- Hydrology and Drought Analysis
- Soil erosion and sediment transport
- Aquatic Invertebrate Ecology and Behavior
- Geology and Paleoclimatology Research
- Soil Moisture and Remote Sensing
- Soil and Water Nutrient Dynamics
- Geochemistry and Elemental Analysis
- Microbial Community Ecology and Physiology
- Paleontology and Stratigraphy of Fossils
- Isotope Analysis in Ecology
- Wheat and Barley Genetics and Pathology
- Plant Water Relations and Carbon Dynamics
- Freshwater macroinvertebrate diversity and ecology
- Plant Disease Resistance and Genetics
- Marine and coastal plant biology
- Horticultural and Viticultural Research
University of Otago
2016-2025
National Oceanography Centre
2025
Luxembourg Institute of Science and Technology
2014-2018
GEOMAR Helmholtz Centre for Ocean Research Kiel
2006-2016
University of Life Sciences in Poznań
2016
Association for Computing Machinery
2015
Penn Center for AIDS Research
2015
Consumers, Health, Agriculture and Food Executive Agency
2009-2014
University of Gothenburg
2009-2012
National Library of Luxembourg
2004-2007
We studied the direct effects of CO2 and related changes in seawater carbonate chemistry on marine planktonic organisms a mesocosm experiment. In nine outdoor enclosures (~11 m3 each), partial pressure (pCO2) was modified by an aeration system. The triplicate treatments represented low (~190 parts per million volume (ppmV) CO2), present (~410 ppmV high (~710 CO2) pCO2 conditions. After initial fertilization with nitrate phosphate bloom dominated coccolithophorid Emiliania huxleyi occurred...
Volcanoes confront Earth scientists with new fundamental questions: Can airborne volcanic ash release nutrients on contact seawater, thereby excite the marine primary productivity (MPP); and, most notably, can volcanoes through oceanic fertilization affect global climate in a way that is so far poorly understood? Here we present results from biogeochemical experiments showing 1) subduction zone rapidly an array of (co‐)limiting algal growth vast areas, 2) at speed much faster (minute‐scale)...
Abstract: The effects of cold acclimation on primary metabolism in actively growing poplar ( Populus tremula L. × P. tremuloides Michaux) were studied. Three‐month‐old plants exposed to chilling stress (4 °C) and compared plant material kept at a control temperature (23 °C). This treatment did not affect the survival but growth was almost stopped. freezing tolerance adult leaves increased from ‐ 5.7 °C for 9.8 after 14 days exposure 4 °C. During acclimation, evolution soluble carbohydrate...
During the European Iron Fertilisation Experiment (EIFEX), performed in Southern Ocean, we investigated reactions of different phytoplankton size classes to iron fertilization, applying measurements fractionated pigments, particulate organic matter, microscopy, and flow cytometry. Chlorophyll a (Chl a) concentrations at 20-m depth increased more than fivefold following fertilization through day 26, while carbon (POC), nitrogen (PON), phosphorus (POP) roughly doubled 29. Concentrations Chl...
Abstract. With the onset of new satellite radar constellations (e.g. Sentinel-1) and advances in computational science grid computing) enabling supply processing multi-mission data at a temporal frequency that is compatible with real-time flood forecasting requirements, this study presents concept for sequential assimilation Synthetic Aperture Radar (SAR)-derived water stages into coupled hydrologic-hydraulic models. The proposed methodology consists adjusting storages fluxes simulated by...
Abstract. Satellite-based active microwave sensors not only provide synoptic overviews of flooded areas, but also offer an effective way to estimate spatially distributed river water levels. If rapidly produced and processed, these data can be used for updating hydraulic models in near real-time. The usefulness such approaches with real event sets provided by currently existing has yet demonstrated. In this case study, a Particle Filter-based assimilation scheme is integrate ERS-2 SAR...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 470:191-205 (2012) - DOI: https://doi.org/10.3354/meps10082 Influence of ocean warming and acidification on trace metal biogeochemistry Linn J. Hoffmann1,2,*, Eike Breitbarth1,2, Philip W. Boyd3, Keith A. Hunter1 1Department Chemistry, University Otago, PO Box 56, Dunedin 9054, New Zealand 2GEOMAR Helmholtz...
Ocean acidification and greenhouse warming will interactively influence competitive success of key phytoplankton groups such as diatoms, but how long-term responses to global change affect community structure is unknown. We incubated a mixed natural diatom from coastal New Zealand waters in short-term (two-week) incubation experiment using factorial matrix and/or elevated pCO2 measured effects on structure. then isolated the dominant diatoms clonal cultures conditioned them for 1 year under...
Abstract. In hydrological models, evaporation from interception is often disregarded, combined with transpiration, or taken as a fixed percentage of rainfall. general not considered to be significant process in rainfall-runoff modelling. However, it appears that on average can amount 20–50% the precipitation. Therefore, knowledge about important. Traditional research mainly focuses canopy and almost completely denies forest floor interception, although this an important mechanism precedes...
Background and Aims Late frosts are a significant risk to grape production in frost-prone viticultural regions. Increasing air temperature because of climate change is likely advance budburst last frost events spring. So far, it unclear whether one trend will be more pronounced than the other, hence, late damage increase or decrease. The aim this work was investigate future Luxembourgish winegrowing region by assessing effect simulated conditions on timing date. Methods Results assessed...
Abstract. Based on an international workshop (Gothenburg, 14–16 May 2008), this review article aims to combine interdisciplinary knowledge from coastal and open ocean research iron biogeochemistry. The major scientific findings of the past decade are structured into sections natural artificial fertilization, inputs estuarine systems, colloidal organic matter, biological processes. Potential effects global climate change, particularly acidification, biogeochemistry discussed. synthesized...
High concentrations of microplastics have been found in sea ice but the mechanisms by which they get captured into and role algae might play this process remain unknown. Similarly, we do not know how presence impact colonization algae. To estimate ecological for Polar ecosystems, it is essential to understand their behaviour during formation possible interactions with organisms inhabiting ice. In study tested interaction between Fragillariopsis cylindrus microplastic beads without present...
Abstract Oligotrophic subtropical gyres are the largest continuous biomes on Earth and play a key role in global biogeochemical cycles. Microbial communities govern primary production carbon cycling oligotrophic South Pacific Gyre, yet ecological processes which underpin microbial biogeography region remain understudied. We investigated community assembly at three depths over ~2,000‐km transect was longitudinal, so ran from 32°S, 170°W to 152°W). Thus latitude (32°S) constant. surface waters...