A5071753168- Freshwater macroinvertebrate diversity and ecology
- Soil and Water Nutrient Dynamics
- Fish Ecology and Management Studies
- Aquatic Ecosystems and Phytoplankton Dynamics
- Hydrology and Sediment Transport Processes
- Hydrology and Watershed Management Studies
- Coastal wetland ecosystem dynamics
- Peatlands and Wetlands Ecology
- Climate change and permafrost
- Ecology and Vegetation Dynamics Studies
- Soil erosion and sediment transport
- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Cryospheric studies and observations
- Aquatic Invertebrate Ecology and Behavior
- Environmental DNA in Biodiversity Studies
- Bryophyte Studies and Records
- Diatoms and Algae Research
- Geology and Paleoclimatology Research
- Biological Control of Invasive Species
- Species Distribution and Climate Change
- Arctic and Antarctic ice dynamics
- Marine and coastal plant biology
- Lichen and fungal ecology
- Plant responses to water stress
Aarhus University
2016-2025
Water Technology (Australia)
2020
Ecological Society of America
2017-2018
John Wiley & Sons (United States)
2017-2018
National Institute of Water and Atmospheric Research
2001-2005
University of Copenhagen
1998-2001
Abstract Fluvial riparian vegetation (RV) links fluvial and terrestrial ecosystems. It is under significant pressure from anthropogenic activities, and, therefore, the management restoration of RV are increasingly important worldwide. has been investigated different perspectives, so knowledge on its structure function widely distributed. An step forward to convert existing into an overview easily accessible—for example, for use in decision-making management. We aim provide ecosystem services...
Macrophytes play a key role in many unshaded lotic ecosystems, but little is known of the factors controlling their presence, abundance, and composition. Macrophyte diversity, composition were studied 15 New Zealand streams to test hypotheses that presence development macrophytes systems primarily controlled by hydrologic regime (frequency high‐velocity flood events) interflood spatial distribution performance taxa more stable strongly influenced local hydraulic conditions...
Summary 1 Freshwater habitats in cultivated and densely populated lowland regions of Europe have experienced profound changes during the last 100 years. We take advantage long interest aquatic plants Denmark to compare submerged flora lakes streams 1896 1996. 2 Most which contained a diverse vegetation years ago now high phytoplankton biomasses summer transparencies below 2.0 m characteristic eutrophication. The majority 17 included both old recent studies lost all or most their species....
Long-distance dispersal can affect speciation processes in two opposing ways. Dispersal promote geographic isolation or it bring together geographically distant and distantly related genotypes, thus counteracting local differentiation. We used the Gulf Coast of North America (GC), a "hot spot" reed diversity evolutionary dynamics, as model system to study diversification within invasive, cosmopolitan, polyploid grass Phragmites.Genetic was studied using collections representing all species...
Abstract Many inland waters exhibit complete or partial desiccation, have vanished due to global change, exposing sediments the atmosphere. Yet, data on carbon dioxide (CO 2 ) emissions from these are too scarce upscale for estimates understand their fundamental drivers. Here, we present results of a survey covering 196 dry across diverse ecosystem types and climate zones. We show that CO share drivers constitute substantial fraction cycled by waters. were consistent zones, with local...
Unlike in land plants, photosynthesis many aquatic plants relies on bicarbonate addition to carbon dioxide (CO2) compensate for the low diffusivity and potential depletion of CO2 water. Concentrations vary greatly with catchment geology. In this study, we investigate whether there is a link between these concentrations frequency freshwater possessing use trait. We show, globally, that plant species trait increases concentration. Regionally, however, reduced at sites where concentration...
Abstract Headwater streams remove, transform, and store inorganic nitrogen (N) delivered from surrounding watersheds, but excessive N inputs human activity can saturate removal capacity. Most research has focused on quantifying the water column over short periods in individual reaches, these ecosystem‐scale measurements suggest that assimilatory uptake accounts for most removal. However, cross‐system comparisons addressing relative role of particular biota responsible incorporating into...
1. The objective of the present study was to examine how physical stream environment in regulated and unregulated lowland streams affects diversity distribution macrophyte communities. We analysed abundance, composition macrophytes, together with parameters, seven unshaded Danish reaches. 2. Total coverage similar streams, but species richness Shannon were higher streams. Overall, we found fifty‐two different reaches sixty‐two spatial macrophytes on bottom more heterogeneous 3. positive...
Summary 1. Streams are subject to frequent natural and anthropogenic disturbances that cause sediment erosion loss of submerged vegetation. This makes downstream transport retention vegetative propagules on the streambed very important for re‐establishing vegetation cover. We measured dispersal macrophyte stem fragments (15–20 cm long) along 300 m long reaches four small medium sized Danish lowland streams. 2. The number drifting declined exponentially with distance below point release....
The successful spread of invasive plants in new environments is often linked to multiple introductions and a diverse gene pool that facilitates local adaptation variable environmental conditions. For clonal plants, however, phenotypic plasticity may be equally important. Here the primary adaptive strategy three non-native, clonally reproducing macrophytes (Egeria densa, Elodea canadensis Lagarosiphon major) New Zealand freshwaters were examined an attempt was made link observed differences...
Abstract Riparian zones are the paragon of transitional ecosystems, providing critical habitat and ecosystem services that especially threatened by global change. Following consultation with experts, 10 key challenges were identified to be addressed for riparian vegetation science management improvement: (1) Create a distinct scientific community establishing stronger bridges between disciplines; (2) Make more visible appreciated in society policies; (3) Improve knowledge regarding...
1. European lowland streams have experienced increased perturbation and eutrophication during the past 100 years. We use archive information from 27 Danish stream sites around 1896 new data 208 in 1996 to evaluate accompanying changes vegetation. Among sites, 13 were both studied 1996. 2. The species richness of submerged plants has declined profoundly over 100‐year period, particularly among large group Potamogeton species. This is evident direct comparison reaches included studies, general...
Two Phragmites australis taxa are recognized in Europe: P. ssp. altissimus, also known as isiaca, the Mediterranean region and temperate region. Another taxonomic group is frutescens. European genotypes diverse genetically, cytologically morphologically, related to African, Asiatic American genotypes. We investigated chloroplast DNA (cpDNA) diversity Europe defined current borders of gene pool. analysed variation with parsimony genetic distance methods, compared it that nuclear amplified...
Summary 1. A tracer release study was conducted in a macrophyte‐rich stream, the River Lilleaa Denmark. The objectives of were to compare uptake rates per unit area by primary producers and consumers macrophyte non‐macrophyte habitats, estimate whole‐stream this other stream types, identify pathways rate at which enters food web habitats. 2. Macrophyte habitats had four times higher an equal habitat as compared These represent lower limit potential effects because will be highly dependent on...