A5069920702- Fish Ecology and Management Studies
- Aquatic Invertebrate Ecology and Behavior
- Species Distribution and Climate Change
- Ecology and Vegetation Dynamics Studies
- Freshwater macroinvertebrate diversity and ecology
- Plant and animal studies
- Marine and fisheries research
- Wildlife Ecology and Conservation
- Genetic diversity and population structure
- Animal Behavior and Reproduction
- Evolution and Genetic Dynamics
- Animal Ecology and Behavior Studies
- Mathematical and Theoretical Epidemiology and Ecology Models
- Avian ecology and behavior
- Marine and coastal ecosystems
- Isotope Analysis in Ecology
- Environmental DNA in Biodiversity Studies
- Insect-Plant Interactions and Control
- Aquatic Ecosystems and Phytoplankton Dynamics
- Physiological and biochemical adaptations
- Plant Parasitism and Resistance
- Genetic and phenotypic traits in livestock
- Marine Biology and Ecology Research
- Insect and Arachnid Ecology and Behavior
- Forensic and Genetic Research
Umeå University
2014-2023
Umeå Plant Science Centre
2012
Uppsala University
2010
Stockholm University
2006
University of Kentucky
1997-2000
The use of lake sedimentary DNA to track the long-term changes in both terrestrial and aquatic biota is a rapidly advancing field paleoecological research. Although largely applied nowadays, knowledge gaps remain this there therefore still research be conducted ensure reliability signal. Building on most recent literature seven original case studies, we synthesize state-of-the-art analytical procedures for effective sampling, extraction, amplification, quantification and/or generation...
We theoretically explore consequences of warming for predator-prey dynamics, broadening previous approaches in three ways: we include beyond-optimal temperatures, predators may have a type III functional response, and prey carrying capacity depends on explicitly modelled resources. Several robust patterns arise. The relationship between temperature can range from near-independence to monotonically declining/increasing hump-shaped. Predators persist U-shaped region resource supply...
Abstract Empirical research has for a long time observed that animal densities may both increase and decrease with patch size, these variable responses have been difficult to explain using the current theoretical framework. The most influential hypothesis, resource concentration predicts only positive density–area relations, as consequence of different emigration immigration rates in small large patches, empirical deviations inspired flurry alternative explanations. In this paper, we use...
The temperature dependence of predation rates is a key issue for understanding and predicting the responses ecosystems to climate change. Using simple mechanistic model, we demonstrate that differences in relative performances predator prey can cause strong threshold effects attack rates. Empirical data on rate northern pike ( Esox lucius ) feeding brown trout Salmo trutta confirm this result. Attack fell sharply below +11°C, which corresponded shift performance with respect maximum escape...
SUMMARY Crayfish in headwater streams are subjected to predation from two sources: (a) fish; and (b) terrestrial predators including wading birds mammals. Field observations of the mortality tethered crayfish size classes were used examined how risks imposed by types varied with water depth size. We also distribution large small stream pools without predatory fish. Predatory fish, mostly green sunfish, Lepomis cyctuellus , creek chub, Semotilus atromaculatus rapidly consumed (body length =...
The value of meta-analysis in ecology hinges on the reproducibility patterns generated by quantitative synthesis. Meta-analysts will vary criteria they use to screen studies and select data within studies, even when addressing exactly same question. We summarize some many decisions that an ecologist must make deciding what include a then show, using multiple meta-analyses taken from literature stream predation experiments, meta-analytic conclusions can be colored selection are not...
Field experiments involving local manipulations of predator densities are an important tool for studying the role predation in natural communities. I use mathematical models to investigate how treatment effects should vary with size area manipulated open experiments, i.e., studies that allow prey migrate and out from experimental units. The most general result is influence movements on decreases increasing spatial scale experiment, while effect rate independent scale. Thus, results seen...
Natural occurrence of overturned stones and the distribution moss with respect to stone size stability were examined in two North Swedish woodland streams. In total, 16.7% moss-covered had obviously been last few years. Moss was rare on small except for those that embedded surrounding substrate. On large (>12 cm), abundant embedment did not affect here. It is concluded substrates markedly affected stream moss. a field experiment, simulate mild spate effects, recovery invertebrates followed...
A major area of current research is to understand how climate change will impact species interactions and ultimately biodiversity. variety environmental conditions are rapidly changing owing warming, these often affect both the strength outcome interactions. We used fish distributions replicated introductions investigate influencing coexistence two fishes in Swedish lakes: brown trout (Salmo trutta) pike (Esox lucius). logistic regression model showed that coexist large lakes (more than 4.5...
Abstract The 1.5 °C target for global warming calls evaluating short-term (30–50 years) climate change mitigation with different forests usage. In the current scientific literature and in public debate, there are contrasting views on how should be managed to maximize total benefit, including use of products changes carbon pools. Three major factors influence conclusions studies: (a) time horizon, (b) site productivity, (c) substitution calculations. Here we show dependency among these by an...
Habitat fragmentation may strongly affect species density, interactions, and the rate of ecosystem processes. It is therefore important to understand observed variability among responses underlying mechanisms. In this study, we compare density-area relationships (DARs) for 344 lepidopteran belonging 22 families (butterflies moths). This analysis suggested that DAR(slope) generally positive moths negative butterflies. The differences are occur because largely olfactory searchers, whereas most...
Abstract Scale transition theory is a framework for predicting regional population dynamics from local process functions and estimates of spatial heterogeneity. Using this framework, we estimated scale functional responses benthic predator–prey system in the Baltic Sea. Functional were based on laboratory experiments or field observations stomach contents, prey densities measured at (0.1 m 2 ) (300 km ). Laboratory data overestimated consumption high densities, whereas predictions tallied...
Phenotypic plasticity is the ability of one genotype to produce different phenotypes depending on environmental conditions. Several conceptual models emphasize role in promoting reproductive isolation and, ultimately, speciation populations that forage two or more resources. These predict plays a critical early stages speciation, prior genetic divergence, by facilitating fast phenotypic divergence. The plastically express alternative may, however, interfere with phase formation barriers,...
We sampled macroinvertebrates in 51 rapids regulated and unregulated north Swedish rivers. Our objective was to quantify the effects on invertebrate fauna of altered flow patterns, habitat area isolation. The remaining rivers have two types regime: (a) Those with pattern, but unreduced flow, are characterized by low long-term variation high day variation. Typically, spring flood is strongly reduced, whereas winter greatly increased relation situation streams. (b) Rapids from which a major...
1. We examine the relationship between immigration rate and patch area for different types of movement behaviours detection modes. Theoretical models suggest that scale dependence per unit (I/A) can be described by a power model I/A = i*Area(zeta), where zeta describes strength dependence. 2. Three scaling were identified. Area (zeta 0) is expected passively dispersed organisms have same probability landing anywhere in patch. Perimeter (-0.30 > -0.45) when patches are detected from very...
1 The keystone piscivore northern pike Esox lucius can structure fish communities, and models predicting pike-focused connectivity will be important for management of many waters. 2 We explored the ability to colonize upstream locations modelled presence–absence in lakes based on landscape features derived from maps. An model (UC model) was generated using data 87 lakes. validated UC with retrospective whole-lake experiments involving introductions (n = 49) extirpations (by rotenone) 96), as...
Abstract Diamond [Assembly of species communities. In: Ecology and Evolution Communities (eds Cody, M.L. & Diamond, J.M.). Harvard University Press, Cambridge, pp. 342–444] proposed that resource competition leads to checkerboard‐like distributions competing species. This proposal prompted research revealed checkerboard patterns within a wide range communities, but the mechanisms generate such are still poorly understood. Here we present whole‐lake natural experiments analyses...