Search results for: Micael Jonsson

Items from 1 to 20 out of 24 results

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Guiding downstream migrating Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) of different life stages in a large river using bubbles

Johan Leander, Gustav Hellström, Jonathan Nordin, Micael Jonsson, more

River Research and Applications > 40 > 1 > 107 - 115

Salmonid repeat spawners are precious individuals for wild populations due to their high fecundity and previous spawning experience, making them important in environmental policy. However, repeat spawners rarely exist above hydropower dams in regulated rivers as the mortality of post‐spawners (kelts) when passing through turbines during downstream migration is very high. To mitigate this problem,...

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Seasonal variation in the coupling of microbial activity and leaf litter decomposition in a boreal stream network

Elliot Bastias, Ryan A. Sponseller, Mirco Bundschuh, Micael Jonsson

Freshwater Biology > 67 > 5 > 812 - 827

Most stream networks are characterised by spatial and temporal variability in the physico‐chemical conditions that regulate microbial processing of particulate organic matter. How these patterns control the turnover of particulate organic matter via altered activity of leaf‐associated microbes has rarely been studied in high‐latitude landscapes, particularly throughout long (i.e., up to 6 months)...

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Environmentally relevant concentrations of the common anxiolytic pharmaceutical oxazepam do not have acute effect on spawning behavior in mature male Atlantic salmon (Salmo salar) parr

Gustav Hellström, Tomas Brodin, Micael Jonsson, Håkan Olsen, more

Journal of Applied Ichthyology > 36 > 1 > 105 - 112

Low concentrations of psychiatric drugs are commonly found in surface waters around the world, and their ability to alter behaviors in aquatic fauna has raised concerns about ecological effects. One critical effect that contamination can have in aquatic systems is modifications of reproductive behaviors. In this study, we hypothesized that oxazepam, a common anxiolytic drug and aquatic contaminant...

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Catchment properties predict autochthony in stream filter feeders

Micael Jonsson, Lina E. Polvi, Ryan A. Sponseller, Karolina Stenroth

Hydrobiologia > 2018 > 815 > 1 > 83-95

Stream ecological theory predicts that the use of allochthonous resources declines with increasing channel width, while at the same time primary production and autochthonous carbon use by consumers increase. Although these expectations have found support in several studies, it is not well known how terrestrial runoff and/or inputs of primary production from lakes alter these longitudinal patterns...

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Screening of benzodiazepines in thirty European rivers

Jerker Fick, Tomas Brodin, Martina Heynen, Jonatan Klaminder, more

Chemosphere > 2017 > 176 > C > 324-332

Pharmaceuticals as environmental contaminants have received a lot of interest over the past decade but, for several pharmaceuticals, relatively little is known about their occurrence in European surface waters. Benzodiazepines, a class of pharmaceuticals with anxiolytic properties, have received interest due to their behavioral modifying effect on exposed biota. In this study, our results show the...

article

Land use influences macroinvertebrate community composition in boreal headwaters through altered stream conditions

Micael Jonsson, Ryan M. Burrows, Johan Lidman, Emma Fältström, more

Ambio > 2017 > 46 > 3 > 311-323

Land use is known to alter the nature of land–water interactions, but the potential effects of widespread forest management on headwaters in boreal regions remain poorly understood. We evaluated the importance of catchment land use, land cover, and local stream variables for macroinvertebrate community and functional trait diversity in 18 boreal headwater streams. Variation in macroinvertebrate metrics...

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Home alone—The effects of isolation on uptake of a pharmaceutical contaminant in a social fish

Martina Heynen, Tobias Backström, Jerker Fick, Micael Jonsson, more

Aquatic Toxicology > 2016 > 180 > C > 71-77

A wide range of biologically active pharmaceutical residues is present in aquatic systems worldwide. As uptake potential and the risk of effects in aquatic wildlife are directly coupled, the aim of this study was to investigate the relationships between stress by isolation, uptake and effects of the psychiatric pharmaceutical oxazepam in fish. To do this, we measured cortisol levels, behavioral stress...

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Effect of bioconcentration and trophic transfer on realized exposure to oxazepam in 2 predators, the dragonfly larvae (Aeshna grandis) and the Eurasian perch (Perca fluviatilis)

Martina Heynen, Jerker Fick, Micael Jonsson, Jonatan Klaminder, more

Environmental Toxicology and Chemistry > 35 > 4 > 930 - 937

Psychoactive substances are used worldwide and constitute one of the most common groups of pharmaceutical contaminants in surface waters. Although these pharmaceuticals are designed to be efficiently eliminated from the human body, very little is known about their trophic‐transfer potential in aquatic wildlife. Therefore, the goal of the present study was to quantify and compare uptake of an anxiolytic...

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Above‐ground and below‐ground responses to long‐term nutrient addition across a retrogressive chronosequence

David A. Wardle, Micael Jonsson, Jordan R. Mayor, Daniel B. Metcalfe, more

Journal of Ecology > 104 > 2 > 545 - 560

There is much interest in understanding ecosystem responses to local‐scale soil fertility variation, which has often been studied using retrogressive chronosequences that span thousands of years and show declining fertility and plant productivity over time. There have been few attempts to experimentally test how plant nutrient limitation changes during retrogression.We studied a well‐characterized...

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Upscaling behavioural studies to the field using acoustic telemetry

Gustav Hellström, Jonatan Klaminder, Micael Jonsson, Jerker Fick, more

Aquatic Toxicology > 2016 > 170 > C > 384-389

Laboratory-based behavioural assays are often used in ecotoxicological studies to assess the environmental risk of aquatic contaminants. While results from such laboratory-based risk assessments may be difficult to extrapolate to natural environments, technological advancements over the past decade now make it possible to perform risk assessments through detailed studies of exposed individuals in...

article

Effects of an antihistamine on carbon and nutrient recycling in streams

Micael Jonsson, Ellen Ershammar, Jerker Fick, Tomas Brodin, more

Science of The Total Environment > 2015 > 538 > C > 240-245

In stream ecosystems, microbes and macroinvertebrates consume leaf litter deposited from the riparian vegetation, and thereby recycle resources tied up in the litter. Several environmental variables influence rates of this recycling, but it is not well known if common pharmaceuticals, such as antihistamines, originating from wastewater effluent, have additional impacts. Exposure to dilute concentrations...

article

Nitrogen limitation of heterotrophic biofilms in boreal streams

Ryan M. Burrows, Erin R. Hotchkiss, Micael Jonsson, Hjalmar Laudon, more

Freshwater Biology > 60 > 7 > 1237 - 1251

Nutrient limitation of the biofilm is fundamental to stream ecosystem processes, as microbial activity shapes the biological availability and biogeochemical cycling of carbon and nutrients.We used nutrient‐diffusing substrata (NDS) to investigate heterotrophic nutrient limitation of microbial respiration (MR) across 20 streams draining boreal landscapes in northern Sweden. We also explored variation...

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Direct and Indirect Drivers of Moss Community Structure, Function, and Associated Microfauna Across a Successional Gradient

Micael Jonsson, Paul Kardol, Michael J. Gundale, Sheel Bansal, more

Ecosystems > 2015 > 18 > 1 > 154-169

Relative to vascular plants, little is known about what factors control bryophyte communities or how they respond to successional and environmental changes. Bryophytes are abundant in boreal forests, thus changes in moss community composition and functional traits (for example, moisture and nutrient content; rates of photosynthesis and respiration) may have important consequences for ecosystem processes...

article

Climate change modifies the size structure of assemblages of emerging aquatic insects

Micael Jonsson, Per Hedström, Karolina Stenroth, Erin R. Hotchkiss, more

Freshwater Biology > 60 > 1 > 78 - 88

Climate change is expected to not only raise water temperatures, but also to cause brownification of aquatic ecosystems via increased inputs of terrestrial dissolved organic matter. While efforts have been made to understand how increased temperature and brownification separately influence aquatic food webs, their interactive effects have been less investigated. Further, although climate change effects...

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Land‐use effects on terrestrial consumers through changed size structure of aquatic insects

Karolina Stenroth, Lina E. Polvi, Emma Fältström, Micael Jonsson

Freshwater Biology > 60 > 1 > 136 - 149

We assessed the influence of agricultural land use on aquatic–terrestrial linkages along streams arising from changes in the emergence of aquatic insects. We expected that terrestrial predators would respond to a change in the abundance and/or the size structure of the emerging aquatic insects by an increase or decrease in population size.We measured the flux of emergent aquatic insects and the abundance...

article

Reduced breeding success of Pied Flycatchers Ficedula hypoleuca along regulated rivers

Darius Strasevicius, Micael Jonsson, N. Erik I. Nyholm, Björn Malmqvist, more

Ibis > 155 > 2 > 348 - 356

Most large rivers in northern Sweden are regulated to produce hydropower, with subsequent effects on flow dynamics and aquatic insect communities. Several studies have shown that aquatic and terrestrial systems are intimately connected via the export of emergent aquatic insects, but few have assessed how human modifications of aquatic habitats may influence this connection. We compared breeding success...

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Influences of river regulation and environmental variables on upland bird assemblages in northern Sweden

Micael Jonsson, Darius Strasevicius, Björn Malmqvist

Ecological Research > 2012 > 27 > 5 > 945-954

Most large rivers in Sweden are regulated to produce hydropower. This transformation from free-flowing rivers to chains of elongate run-of-river impoundments has been shown to have consequences for aquatic, riparian and adjacent upland environments, and for the emergence patterns of aquatic insects that are important for terrestrial consumers. In this study, we investigated bird assemblages in upland-forest...

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Linking vegetation change, carbon sequestration and biodiversity: insights from island ecosystems in a long‐term natural experiment

David A. Wardle, Micael Jonsson, Sheel Bansal, Richard D. Bardgett, more

Journal of Ecology > 100 > 1 > 16 - 30

1. Despite recent interest in linkages between above‐ and below‐ground communities and their consequences for ecosystem processes, much remains unknown about their responses to long‐term ecosystem change. We synthesize multiple lines of evidence from a long‐term ‘natural experiment’ to illustrate how ecosystem retrogression (the decline in ecosystem process rates due to long‐term absence of major...

article

Direct and indirect effects of area, energy and habitat heterogeneity on breeding bird communities

Micael Jonsson, Göran Englund, David A. Wardle

Journal of Biogeography > 38 > 6 > 1186 - 1196

Aim To compare the ability of island biogeography theory, niche theory and species–energy theory to explain patterns of species richness and density for breeding bird communities across islands with contrasting characteristics. Location Thirty forested islands in two freshwater lakes in the boreal forest zone of northern Sweden (65°55′ N to 66°09′ N; 17°43′ E to 17°55′ E). Methods We performed...

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The influence of freshwater-lake subsidies on invertebrates occupying terrestrial vegetation

Micael Jonsson, David A. Wardle

Acta Oecologica > 2009 > 35 > 5 > 698-704

Studies investigating effects of aquatic-derived resource subsidies have often found large effects on terrestrial systems. Those studies have mostly been performed on effects of subsidies derived from oceanic and riverine systems, and very few have considered effects of subsidies from freshwater lakes. However, since lakes can produce large quantities of emergent aquatic insects that end up on nearby...

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INFONA - science communication portal

Search results for: Micael Jonsson

Guiding downstream migrating Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) of different life stages in a large river using bubbles

Seasonal variation in the coupling of microbial activity and leaf litter decomposition in a boreal stream network

Environmentally relevant concentrations of the common anxiolytic pharmaceutical oxazepam do not have acute effect on spawning behavior in mature male Atlantic salmon (Salmo salar) parr

Catchment properties predict autochthony in stream filter feeders

Screening of benzodiazepines in thirty European rivers

Land use influences macroinvertebrate community composition in boreal headwaters through altered stream conditions

Home alone—The effects of isolation on uptake of a pharmaceutical contaminant in a social fish

Effect of bioconcentration and trophic transfer on realized exposure to oxazepam in 2 predators, the dragonfly larvae (Aeshna grandis) and the Eurasian perch (Perca fluviatilis)

Above‐ground and below‐ground responses to long‐term nutrient addition across a retrogressive chronosequence

Upscaling behavioural studies to the field using acoustic telemetry

Effects of an antihistamine on carbon and nutrient recycling in streams

Nitrogen limitation of heterotrophic biofilms in boreal streams

Direct and Indirect Drivers of Moss Community Structure, Function, and Associated Microfauna Across a Successional Gradient

Climate change modifies the size structure of assemblages of emerging aquatic insects

Land‐use effects on terrestrial consumers through changed size structure of aquatic insects

Reduced breeding success of Pied Flycatchers Ficedula hypoleuca along regulated rivers

Influences of river regulation and environmental variables on upland bird assemblages in northern Sweden

Linking vegetation change, carbon sequestration and biodiversity: insights from island ecosystems in a long‐term natural experiment

Direct and indirect effects of area, energy and habitat heterogeneity on breeding bird communities

The influence of freshwater-lake subsidies on invertebrates occupying terrestrial vegetation

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