A5033097614- Fish Ecology and Management Studies
- Marine and fisheries research
- Hydrology and Sediment Transport Processes
- Aquatic Invertebrate Ecology and Behavior
- Historical and Archaeological Studies
- Freshwater macroinvertebrate diversity and ecology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Physiological and biochemical adaptations
- Wildlife Ecology and Conservation
- Image Processing and 3D Reconstruction
- Fish Biology and Ecology Studies
- Social and Educational Sciences
- Animal Behavior and Reproduction
- Aquaculture Nutrition and Growth
- Ancient and Medieval Archaeology Studies
- Hydrology and Watershed Management Studies
- Ecology and biodiversity studies
- Soil and Water Nutrient Dynamics
- Environmental DNA in Biodiversity Studies
- Isotope Analysis in Ecology
- Fish biology, ecology, and behavior
- Species Distribution and Climate Change
- Marine Bivalve and Aquaculture Studies
- Aquatic Ecosystems and Biodiversity
- Archaeology and ancient environmental studies
Karlstad University
2015-2024
Swedish Institute for Studies in Education and Research
2024
Colorado Parks and Wildlife
2023
Hy-Line (United States)
2009
Philadelphia University
2009
Lund University
1997-1999
Abstract Background : According to the Swedish curriculum teachers in all subjects have a responsibility integrate holistic perspective of sustainable development (SD) and teach according an education for (ESD) approach. However previous research has shown that from different perceive SD differently. Purpose The study aimed at investigating if how teachers’ subject area influences their ability implement ESD; we investigated both impact teaching traditions barriers experienced. Sample A...
This article describes the results of a nationwide questionnaire study 3229 Swedish upper secondary school teachers' conceptual understanding sustainable development in relation to their subject discipline and teaching experience. Previous research has shown that teachers have difficulties complex concept development. According curriculum, all subjects should integrate holistic perspective including economic, ecological, social dimensions. shows differ mostly according traditions. Social...
Along a gradient of increasing productivity in lakes, the abundance perch (Perca fluviatilis) first increases and then decreases, whereas ruffe (Gymnocephalus cernuus) that roach (Rutilus rutilus) continue to increase. Perch, unlike ruffe, undergoes dramatic ontogenetic diet shifts. The decrease along may be due competition from at its plankton—feeding stage benthic—macroinvertebrate—feeding stage. Previous studies these three species have focused on effects other species. To further examine...
Foraging abilities and niche breadths of two percids, Perca fluviatilis Gymnocephalus cernua, under different environmental conditions
Abstract – Alternative reproductive tactics are commonly reported for salmonids (Pisces) and typically involve large migratory small resident individuals. Variation in tendency should reflect the different benefits costs that two phenotypes face with regard to fitness. Therefore, effect of food availability on adoption a tactic brown trout was investigated. Fifty were placed each 12 tanks fed at three levels. Growth‐related variables measured regularly, end experiment, proportion migrants...
Abstract Passage of fish through hydropower dams is associated with mortality, delay, increased energy expenditure and migratory failure for migrating the need remedial measures both upstream downstream migration widely recognised. A functional passage must ensure safe timely routes that a substantial portion will use. solutions address not only number or percentage successfully pass barrier, but also time it takes to pass. Here, we used radiotelemetry study functionality bypass...
Nonanadromous Atlantic salmon (Salmo salar) exhibit a combination of variation in life history, habitat, and species co-existence matched by few vertebrates. Distributed eastern North America northern Europe, habitat ranges from hundreds metres river to Europe’s largest lakes. As juveniles, those with access lake usually migrate feed grow prior reproduction. Prey such as smelt (Osmerus mordax, Osmerus eperlanus) vendace (Coregonus albula) facilitate large body size (50–85 cm at maturity)...
Populations of fishes provide valuable services for billions people, but face diverse and interacting threats that jeopardize their sustainability. Human population growth intensifying resource use food, water, energy goods are compromising fish populations through a variety mechanisms, including overfishing, habitat degradation declines in water quality. The important challenges raised by these issues have been recognized led to considerable advances over past decades managing mitigating...
Abstract Cross‐boundary fluxes of organisms and matter, termed “subsidies,” are now recognized to be reciprocal roughly equal importance for both aquatic terrestrial systems, even if input ecosystems has received most attention. The magnitude aquatic‐to‐terrestrial subsidies is well documented, but the drivers behind these their utilization by consumers characteristically local‐scale studies, limiting inferences that can drawn broader geographic scales. We therefore built analyzed a database...
Subsidies of energy and material from the riparian zone have large impacts on recipient stream habitats. Human-induced changes, such as deforestation, may profoundly affect these pathways. However, strength individual factors ecosystems is poorly understood since involved often interact in complex ways. We isolated two factors, manipulating flux terrestrial input intensity light a 2×2 factorial design, where we followed growth diet size-classes brown trout (Salmo trutta) development...
ABSTRACT Relatively little is known about the downstream migration of landlocked stocks Atlantic salmon Salmo salar L. smolts, as earlier studies have generally focused on upstream migration. However, in watersheds with many hydroelectric plants (HEPs), multiplicative loss downstream‐migrating smolts can be high, contributing to population declines or extirpations. Here we report results from a study wild River Klarälven. Salmon tagged acoustic transmitters, were released at different...
Behavioral assays constitute important research tools when assessing how fish respond to environmental change. However, it is unclear behavioral modifications recorded in laboratory are expressed natural ecosystems, a limitation that makes difficult evaluate the predictive power of laboratory-based measurements. In this study, we hypothesized exposure benzodiazepine (i.e., oxazepam) increases boldness and activity as well field – is, results can be used predict results. Moreover, expected...
Relative abundances of perch (Perca fluviatilis) and ruffe (Gymnocephalus cernuus) were studied in eight lakes ranked along a gradient increasing productivity. The diets relation to food resources quantified over 5-mo period one lake moderate high abundance decreased that increased the productivity gradient. Large ate fish whole season more productive lake, but rarely May June less lake. All size classes fed mainly on macrobenthos both lakes. diversity was higher low productivity, as diet...
Surface ice in rivers and lakes buffers the thermal environment provides overhead cover, protecting aquatic animals from terrestrial predators. We tested if surface influenced behavior (swimming activity, aggressive encounters, number of food items eaten) stress level (coloration eyes body) stream-living brown trout Salmo trutta at temperatures 3–4 °C indoor experimental flumes. hypothesized that an individual's resting metabolic rate (RMR, as measured by ventilation rate) would affect...
Decomposition is essential to carbon, nutrient, and energy cycling among within ecosystems. Several methods have been proposed for studying litter decomposition by using a standardized commercially available substrate. One of these the Tea Bag Index (TBI) which uses tea bags (green rooibos tea) incubated ~90 days. The TBI now applied all over globe, but despite its usefulness wide application, (as well as other methods) does not explicitly account differences in potential loss mass due...
Effects of roach Rutilus rutilus on two percids, Perca fluviatilis and Gymnocephalus cernuus: importance species interactions for diet shifts
Abstract Conservation of migratory salmonids requires understanding their ecology at multiple scales, combined with assessing anthropogenic impacts. We present a case‐study from over 100 years data for the endemic landlocked Atlantic salmon ( Salmo salar , Salmonidae) and brown trout trutta in Lake Vänern, Sweden. use this to develop life history‐based research monitoring priorities salmonids. In small wild populations remain only heavily regulated Rivers Klar (Klarälven) Gullspång...
Abstract The purpose of this study was to investigate behavior and survival radio‐tagged wild hatchery‐reared landlocked Atlantic Salmon Salmo salar smolts as they migrated past three hydropower dams equipped with fish bypass solutions in the Winooski River, Vermont. Among smolts, those released early were more likely initiate migration did so after less delay than late. Once initiated, however, late‐released hatchery at greater speeds. Throughout river system, performed similarly fish. Dam...