Nikolai Friberg

Nikolai Friberg
Aarhus University | AU · Department of Bioscience

About

146
Publications
51,853
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5,903
Citations
Citations since 2017
40 Research Items
2695 Citations
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20172018201920202021202220230100200300400500
20172018201920202021202220230100200300400500

Publications

Publications (146)
Article
Full-text available
Unlabelled: Microplastic is now ubiquitous in freshwater, sediment and biota, globally. This is as a consequence of inputs from, for example, waste mismanagement, effluents from wastewater treatment plants and surface runoff from agricultural areas. In this study, we investigated point source pollution of plastic to an upland stream, originating f...
Article
Full-text available
Restoration has been increasingly applied over the last decades as a way to improve the ecological conditions in stream ecosystems, but documentation of the impact of restoration on ecosystem functions is sparse. Here, we applied a space-for-time approach to explore effects of stream restoration on metabolism and organic matter decomposition in low...
Article
Full-text available
Microplastics have been detected in lake environments globally, including in remote regions. Agricultural and populated areas are known to congregate several inputs and release pathways for microplastic. This study investigated microplastic (50–5000 µm) contamination in five Danish freshwater lakes with catchments dominated by arable land use. The...
Article
The cover image is based on the Original Article Temperature and spatial connectivity drive patterns in freshwater macroinvertebrate diversity across the Arctic, by Jennifer Lento et al. https://doi.org/10.1111/fwb.13805.
Book
Full-text available
Rivers of Europe, Second Edition, presents the latest update on the only primary source of complete and comparative baseline data on the biological and hydrological characteristics of more than 180 of the highest profile rivers in Europe. With even more full-color photographs and maps, the book includes conservation information on current patterns...
Chapter
Some of the main rivers of the Central European Highlands and Plains flow into the Baltic and North Seas, including the rivers Weser, Elbe, and Oder, drain the ecoregion of the central European highlands and plains. In addition to these rivers, this chapter describes some smaller but peculiar rivers such as the Em (Sweden), Skjern (Denmark), Spree...
Article
Full-text available
Populations of Atlantic salmon are crashing across most of its natural range: understanding the underlying causes and predicting these collapses in time to intervene effectively are urgent ecological and socioeconomic priorities. Current management techniques rely on phenomenological analyses of demographic population time-series and thus lack a me...
Article
Full-text available
The annual global loss of organic carbon from terrestrial ecosystems into rivers is similar to the organic carbon stored in soils each year. Dissolved organic matter (DOM) flows through the food web to macroinvertebrates, but little is known about the effect of DOM increase on stream food webs and how much macroinvertebrates may contribute to the r...
Article
Full-text available
Riparian forest buffers have multiple benefits for biodiversity and ecosystem services in both freshwater and terrestrial habitats but are rarely implemented in water ecosystem management, partly reflecting the lack of information on the effectiveness of this measure. In this context, social learning is valuable to inform stakeholders of the effica...
Article
Anthropogenic inputs of nutrients and organic matter are common in tropical lowland rivers while little is known about the pollution-induced changes in oxygen availability and respiratory performance of ectotherms in these high temperature systems. We investigated the effects of agriculture and urban land-use on river water oxygen levels (diel meas...
Article
Full-text available
• Warming in the Arctic is predicted to change freshwater biodiversity through loss of unique taxa and northward range expansion of lower latitude taxa. Detecting such changes requires establishing circumpolar baselines for diversity, and understanding the primary drivers of diversity. • We examined benthic macroinvertebrate diversity using a circu...
Article
Full-text available
The aim of this study is to generate a first global overview of pressures and methods used to assess the environmental quality of rivers and streams using macroinvertebrates. In total, 314 peer-review studies were reviewed, published in the period 1997 – 2018, from developing economies in Africa, South-Central America, Mexico and Southern Asia. To...
Article
Full-text available
Riparian zones form a boundary between aquatic and terrestrial ecosystems, with dispro-portionate influences on food web dynamics and ecosystem functioning in both habitats. However,riparian boundaries are frequently degraded by human activities, including urbanization, leading todirect impacts on terrestrial communities and indirect changes that a...
Article
Full-text available
Stream and terrestrial ecosystems are intimately connected by riparian zones that support high biodiversity but are also vulnerable to human impacts. Landscape disturbances, overgrazing, and diffuse pollution of agrochemicals threaten riparian biodiversity and the delivery of ecosystem services in agricultural landscapes. We assessed how terrestria...
Article
Full-text available
Patches of riparian woody vegetation potentially help mitigate environmental impacts of agriculture and safeguard biodiversity. We investigated the effects of riparian forest on invertebrate diversity in coupled stream-riparian networks using a case study in the Zwalm river basin (Flanders, Belgium). Agriculture is one of the main pressures in the...
Article
Patches of riparian woody vegetation potentially help mitigate environmental impacts of agriculture and safeguard biodiversity. We investigated the effects of riparian forest on invertebrate diversity in coupled stream-riparian networks using a case study in the Zwalm river basin (Flanders, Belgium). Agriculture is one of the main pressures in the...
Article
Full-text available
Urbanization impacts stream ecosystems globally through degraded water quality, altered hydrology, and landscape disturbances at the catchment and riparian scales, causing biodiversity losses and altered system functioning. Addressing the "urban stream syndrome" requires multiple mitigation tools, and rehabilitation of riparian vegetation may help...
Article
Full-text available
• Arctic freshwaters support biota adapted to the harsh conditions at these latitudes, but the climate is changing rapidly and so are the underlying environmental filters. Currently, we have limited understanding of broad‐scale patterns of Arctic riverine biodiversity and the correlates of α‐ and β‐diversity. • Using information from a database set...
Article
We collected quantitative macroinvertebrate samples and measured environmental and geographical parameters at 13 sites: six along the main stem and seven in tributaries close to the main channel over a 700 m gradient in altitude and 22 km longitudinal distance along the River Kokra in the Slovenian Alps. Our objectives were 1) to compare longitudin...
Article
Hydromorphological river restoration can significantly alter habitat configuration and modify invertebrate assemblages of rivers and floodplains. However, the consequences of these changes for ecosystem functioning and aquatic-terrestrial interactions are not known. As a restored shoreline has a more heterogeneous structure compared to a straighten...
Article
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This paper serves as an introduction to the CROSSLINK project and highlights the potential for our study to help inform riparian management.
Article
Full-text available
Citation: Demars, B. O. L., N. Friberg, and B. Thornton. 2020. Pulse of dissolved organic matter alters reciprocal carbon subsidies between autotrophs and bacteria in stream food webs. Ecological Monographs 90(1): Abstract. Soils are currently leaching out dissolved organic matter (DOM) at an increasing pace due to climate and land use change or re...
Poster
The CROSSLINK project is a pan-European research project with a multidisciplinary research team from five countries. The project focuses on the role of cross-habitat linkages between stream (aquatic) and adjacent riparian (terrestrial) habitats in modified landscapes. Multiple human pressures can affect longitudinal and lateral connectivity in rive...
Technical Report
Full-text available
CAFF Circumpolar Biodiversity Monitoring Program State of Arctic Freshwater Biodiversity Report.
Article
Full-text available
River ecosystems receive and process vast quantities of terrestrial organic carbon, the fate of which depends strongly on microbial activity. Variation in and controls of processing rates, however, are poorly characterized at the global scale. In response, we used a peer-sourced research network and a highly standardized carbon processing assay to...
Article
Full-text available
River ecosystems receive and process vast quantities of terrestrial organic carbon, the fate of which depends strongly on microbial activity. Variation in and controls of processing rates, however, are poorly characterized at the global scale. In response, we used a peer-sourced research network and a highly standardized carbon processing assay to...
Article
Full-text available
River ecosystems receive and process vast quantities of terrestrial organic carbon, the fate of which depends strongly on microbial activity. Variation in and controls of processing rates, however, are poorly characterized at the global scale. In response, we used a peer-sourced research network and a highly standardized carbon processing assay to...
Article
Full-text available
River ecosystems receive and process vast quantities of terrestrial organic carbon, the fate of which depends strongly on microbial activity. Variation in and controls of processing rates, however, are poorly characterized at the global scale. In response, we used a peer-sourced research network and a highly standardized carbon processing assay to...
Preprint
Full-text available
1. Soils are currently leaching out their organic matter at an increasing pace and darkening aquatic ecosystems due to climate and land use change, or recovery from acidification. The implications for stream biogeochemistry and food webs remain largely unknown, notably the metabolic balance (biotic CO2 emissions), reciprocal subsidies between autot...
Conference Paper
Full-text available
Stream-riparian networks comprise strongly-linked ecosystems that underpin landscape integrity. However, they are subject to multiple human uses and pressures that affect connectivity in these networks, driving biodiversity losses, threatening ecosystem services, and causing stakeholder conflicts. A range of approaches were promoted to understand h...
Article
Full-text available
Natural ecosystems typically consist of many small and few large organisms. The scaling of this negative relationship between body mass and abundance has important implications for resource partitioning and energy usage. Global warming over the next century is predicted to favour smaller organisms, producing steeper mass–abundance scaling and a les...
Technical Report
D3.2 summary - river manuscripts: Manuscript 1 investigates the effects of a two months experimentally induced extreme low-flow scenario on the physical, biological, and functional characteristics in a macrophyte- rich lowland stream. A significant decline in the stream wetted habitat area, an increase in water temperature, and an increase in the a...
Article
The spatial organisation of biotic communities derives from factors operating at a wide range of spatial and temporal scales. Despite strong scientific evidence of prevalent spatial control of community composition in freshwater ecosystems, local environmental factors are often considered as the main drivers of community change. Furthermore, taxono...
Article
The focus of ecosystem restoration has recently shifted from pure rehabilitation objectives to both improving ecological functioning and the delivery of ecosystem services. However, these different targets need to be integrated to create a unified, synergistic, and balanced restoration approach. This should be done by combining state‐of‐the‐art kno...
Article
Streams and rivers are an important source of CO2 emissions. One important control of these emissions is the metabolic balance between photosynthesis, which converts CO2 to organic carbon, and respiration, which converts organic carbon into CO2 (refs,). Carbon emissions from rivers could increase with warming, independently of organic carbon inputs...
Data
Figure S1. Map of the Hengill geothermal valley. Figure S2. Length‐weight relationship for brown trout. Figure S3. Scale radius to fish length relationships. Figure S4. Dietary niche width of trout and invertebrates. Figure S5. Selectivity in the feeding of trout on common prey groups. Table S1. Sample sizes for estimating dietary niche width...
Article
Full-text available
We exposed 34 species of stream macroinvertebrates, representing 29 families, to a 90 min pulse of the pyrethroid lambda-cyhalothrin. For 28 of these species, no pyrethroid ecotoxicity data exists. We recorded mortality rates 6 days post-exposure and the behavioural response to pyrethroid exposure was recorded using automated video tracking. Most a...
Article
Full-text available
River restoration enhances not only habitat diversity in the stream channel and riparian zone, but also retention of organic matter, which together are expected to enhance aquatic-terrestrial linkages, and the range of autochthonous and allochthonous resources. Consequently, alterations of food-web structure and trophic relationships can be expecte...
Article
Full-text available
Global warming is widely predicted to reduce the biomass production of top predators, or even result in species loss. Several exceptions to this expectation have been identified, however, and it is vital that we understand the underlying mechanisms if we are to improve our ability to predict future trends. Here, we used a natural warming experiment...
Article
Full-text available
We review approaches and tools currently used in Nordic countries (Denmark, Finland, Norway and Sweden) for integrated assessment of ‘ecological status’ sensu the EU Water Framework Directive as well as assessment of ‘eutrophication status’ in coastal and marine waters. Integration principles for combining indicators within Biological Quality Eleme...
Chapter
Stream ecology may be influenced by the temporary trapping of solutes in geomorphologic structures, which is usually quantified by fitting the Transient Storage Model to tracer data. This paper explores the relationships between the parameters of this model and those of two simpler models, namely the Advection-Dispersion Model and the Aggregated De...
Article
Full-text available
The ecosystem services (EcoS) concept is being used increasingly to attach values to natural systems and the multiple benefits they provide to human societies. Ecosystem processes or functions only become EcoS if they are shown to have social and/or economic value. This should assure an explicit connection between the natural and social sciences, b...
Article
Full-text available
Global warming is widely predicted to reduce the biomass production of top predators, or even result in species loss. Several exceptions to this expectation have been identified, however, and it is vital that we understand the underlying mechanisms if we are to improve our ability to predict future trends. Here, we used a natural warming experiment...
Article
Previous studies investigating community-level relationships between plant functional trait characteristics and stream environmental characteristics remain scarce. Here, we used community-weighted means to identify how plant traits link to lowland stream typology and how agricultural intensity in the catchment affects trait composition. We analysed...
Article
1.Restoration of river hydromorphology often has limited detected effects on river biota. One frequently discussed reason is that the restored river length is insufficient to allow populations to develop and give the room for geomorphologic processes to occur.2.We investigated ten pairs of restored river sections of which one was a large project in...
Article
We revealed a history of legacy pesticides in water and sediment samples from 19 small streams across an agricultural landscape. Dominant legacy compounds included organochlorine pesticides, such as DDT and lindane, the organophosphate chlorpyrifos and triazine herbicides such as terbutylazine and simazine which have long been banned in the EU. The...
Article
Full-text available
The ongoing degradation of freshwater habitat quality and subsequent losses of biodiversity is alarming. One key to successful freshwater management is to understand how different scale-dependent diversity components (i.e. γ-, α- and β-diversity) change along present-day anthropogenic impact gradients. We used macrophyte, fish and macroinvertebrate...
Article
Full-text available
We evaluated the restoration of physical habitats and its influence on macroinvertebrate community structure in 18 Danish lowland streams comprising six restored streams, six streams with little physical alteration and six channelized streams. We hypothesized that physical habitats and macroinvertebrate communities of restored streams would resembl...
Article
Freshwater habitats and organisms are among the most threatened on Earth, and freshwater ecosystems have been subject to large biodiversity losses. We developed a Climate Change Sensitivity (CCS) indicator based on trait information for a selection of stream-and lake-dwelling Ephemeroptera, Plecoptera and Trichoptera taxa. We calculated the CCS sco...
Article
Full-text available
Understanding and predicting how global warming affects the structure and functioning of natural ecosystems is a key challenge of the 21st century. Isolated laboratory and field experiments testing global change hypotheses have been criticised for being too small-scale and overly simplistic, whereas surveys are inferential and often confound temper...
Article
Pyrethroids are widely used insecticides that may seriously harm aquatic organisms. Being strongly hydrophobic, pyrethroids in solution occur only in short pulses but may be retained in sediments for longer periods. Consequently, most studies consider the chronic exposure of sediment dwelling organisms. We collected data from 16 studies to determin...
Article
Full-text available
Global climate change will affect worldwide agriculture in many ways. The anticipated or already occurring changes raise concerns about the sustainability of production and the ability of agriculture to feed human populations. This appeals to sustainable agriculture providing ecosystem services more efficient