Lars Hansen results 161
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Across much of the Arctic, climate warming has reduced the extent of thicker and more persistent sea ice and increased the prevalence of thinner first-year ice. Thin first-year landfast sea ice is ecologically important because reduced ice thickness can increase light transmission to the ice–water interface, while the associated brine conditions, including salinity and permeability, can strongly influence algal biomass accumul...
Small meter-scale (1–10 m) spatial variability in snow depth, sea ice properties, ice algal biomass and photobiologyNARA Subscribed
Sea ice physical, biological, and chemical properties vary across a wide range of spatial scales, from meters to hundreds or thousands of meters. This spatial variability is commonly attributed to differ-ences in air and ice temperatures, light availability, snow cover thickness, grazing by protozoa, and ocean currents. In situ time series experiments on sea ice are widely used to examine temporal changes in ice algal biomass...
Greenhouse gas (GHG) emissions from coastal aquaculture are an emerging environmental concern, with implications for ecosystem sustainability and climate mitigation. In this preliminary field-based study, we quantified carbon dioxide (CO 2 ), methane (CH 4 ), and nitrous dioxide (N 2 O) fluxes from 35 randomly selected prawn farms in coastal Bangladesh, at a single time point using the floating chamber method, with concurrent...
Pectobacterium brasiliense ( Pbr ) is known to be one of the most virulent Pectobacterium species and is generally widely distributed across the globe, especially known for causing soft rot in potato-tubers and black leg in potato-plants. Currently no treatment mechanism exists, and many studies have focused on alternative treatment approaches such as biocontrol agents. Several studies have used phages targeting Pectobacterium...
A New Pathogen Population Challenges the Prevention and Control of Potato Late Blight in DenmarkNARA Subscribed
Unexpected and severe outbreaks of potato late blight occurred in Denmark during the 2022 growing season due to the emergence and rapid spread of a new SSR genotype, EU43, which exhibited 100% resistance to mandipropamid. This prompted a shift in control recommendations from block applications of fungicides to fungicide mixing and alternation. Three early warning components played a critical role in the effective management of...
Marine megafauna species are affected by a wide range of anthropogenic threats. To evaluate the risk of such threats, species’ vulnerability to each threat must first be determined. We build on the existing threats classification scheme and ranking system of the International Union for Conservation of Nature (IUCN) Red List of Threatened Species by assessing the vulnerability of 256 marine megafauna species to 23 at‐sea threat...
Escape tectonicsNARA Subscribed
This study investigates the seasonal dynamics of Disko Bay (Qeqertarsuup Tunua) in west Greenland. On the eastern side, the bay's hydrography is influenced by ice-ocean interactions and exchange with Ilulissat Icefjord (Kangiata Sullua), while on the western side, the bay exchanges waters with Baffin Bay. Since the mid-1990s, this region has experienced ocean warming, sea-ice decline, and the retreat of Greenland's fastest-flo...
Using augmented reality to avoid excavation damage in Denmark: a qualitative evaluationNARA Subscribed
Excavation damages are costly, in terms of both direct costs of the utility strike and mending broken constructions or utility lines and indirect costs which are reportedly up to 29 higher than the direct costs. The focus on obtaining accurate and reliable documentation of subsurface infrastructure has, thus, increased in recent years. This study, therefore, investigates if reality capture and augmented reality are usable tool...
The large environmental and economic impact of sea lice infestation in the salmon industry has encouraged the development of non-medical methods and preventive strategies to combat sea lice infestation. Sea lice (Lepeophtheirus salmonis and Caligus elongatus) are sensitive to low salinities, and using fresh water as protection against infection may thus significantly reduce sea lice infestation of salmon while reducing the cos...