A5018880001- Hydrology and Sediment Transport Processes
- Ecology and Vegetation Dynamics Studies
- Fish Ecology and Management Studies
- Soil erosion and sediment transport
- Species Distribution and Climate Change
- Hydrology and Watershed Management Studies
- Environmental Conservation and Management
- Peatlands and Wetlands Ecology
- Botany and Plant Ecology Studies
- Genetic diversity and population structure
- Wildlife Ecology and Conservation
- Coastal wetland ecosystem dynamics
- Evolution and Paleontology Studies
- Plant and animal studies
- Freshwater macroinvertebrate diversity and ecology
- Plant Water Relations and Carbon Dynamics
- Ecology and biodiversity studies
- Rangeland and Wildlife Management
- Plant responses to water stress
- Bryophyte Studies and Records
- Aquatic Ecosystems and Phytoplankton Dynamics
- Aquatic Invertebrate Ecology and Behavior
- Botany, Ecology, and Taxonomy Studies
- Soil and Water Nutrient Dynamics
- Conservation, Ecology, Wildlife Education
Umeå University
2016-2025
Stockholm University
2000-2005
The Open University
2003
ABSTRACT Aim Invasion ecology includes many hypotheses. Empirical evidence suggests that most of these can explain the success some invaders to degree in circumstances. If they all are correct, what does this tell us about invasion? We illustrate major themes invasion ecology, and provide an overarching framework helps organize research foster links among subfields more generally. Location Global. Methods review synthesize 29 leading hypotheses plant ecology. Structured around propagule...
We suggest Milankovitch climate oscillations as a common cause for geographical patterns in species diversity, species' range sizes, polyploidy, and the degree of specialization dispersability organisms. Periodical changes orbit Earth climatic termed oscillations, leading to large size location distributions. name these recurrent “orbitally forced dynamics” (ORD). The magnitude ORD varies space time. decreases gradual speciation (attained by over many generations), increases sizes...
▪ Abstract Variations in Earth's orbit with periods of 10–100 thousand years (kyr) (Milankovitch oscillations) have led to recurrent and rapid climatic shifts throughout history. These cause changes the geographical distributions clades, which we term orbitally forced range dynamics (ORD). The magnitude ORD varies geographically, e.g., latitude. Climatic extinction, splitting, merging gene pools clades. They select among individuals clades for traits enhancing ability survive situ establish...
I propose that global patterns in numbers of range-restricted endemic species are caused by variation the amplitude climatic change occurring on time-scales 10-100 thousand years (Milankovitch oscillations). The smaller shifts, more probable it is palaeoendemics survive and diverging gene pools persist without going extinct or merging, favouring evolution neoendemics. Using mean annual temperature since last glacial maximum, estimated from circulation models, show higher an area, fewer...
The long-term effect of water-level regulation on riparian plant communities was assessed for storage reservoirs and run-of-river impoundments. Soon after the onset regulation, there were few species sparse vegetation cover, regardless whether new water level intersected former upland or vegetation. In longer term, an impoverished maintained by reservoirs, whereas in impoundments, some community characteristics deteriorated others recovered compared to adjacent free-flowing rivers.
Regulation and fragmentation by dams belong to the most widespread deliberate impacts of humans on world's rivers, especially in Northern Hemisphere. We evaluated effects hydroelectric development comparing flora vascular plants 200-m-long reaches river margin distributed along eight entire rivers northern Sweden. Four these were free-flowing, four strongly regulated for purposes. First, we compared species diversity per site between free-flowing rivers. To reduce natural, between-river...
Summary 1. Hydropower is often presented as a clean and renewable energy source that environmentally preferable to fossil fuels or nuclear power. production, however, fundamentally transforms rivers their ecosystems by fragmenting channels altering river flows. These changes reduce flow velocity the number of rapids, alter wetland, floodplain delta ecosystems. Dams disrupt dispersal riverine organisms sediment dynamics may biodiversity composition abundance. Freshwater now belong among...
Abstract. Sulphuric acid concentrations were measured and calculated based on pseudo steady state model with corresponding measurements of CO, NOx, O3, SO2, methane non-methane hydrocarbon (NMHC) as well solar spectral irradiance particle number size distributions. The performed a part the EU project QUEST (Quantification Aerosol Nucleation in European Boundary layer) during an intensive field campaign, which was conducted Hyytiälä, Finland March–April 2003. In this paper, closure between...
Rivers are increasingly fragmented by dams, resulting in disruption of natural dispersal pathways and subsequent changes riverine communities. We assessed the effect dams as barriers to plant along rivers comparing flora vascular plants between pairs run-of-river impoundments northern Sweden. Adjacent similar environmental settings develop different riparian floras because species with poor floating capacity become unevenly distributed among impoundments. Such discontinuities were not found...
Summary1 We examined differences in species richness and frequencies of vascular plants the riverbank vegetation between main channel Vindel River system seven its tributaries ...
Summary The importance of dispersal for plant community structure is poorly understood. Previous studies have hypothesized that patterns in the distribution and genetic riparian communities were caused by hydrochory, i.e. water. We separated relative contributions propagules from hydrochory other vectors comparing colonization pairs plots, one subject to flooding deposition hydrochores unflooded. number colonizing individuals mortality rate per year did not differ significantly with...
Summary 1. This paper introduces key messages from a number of papers emanating the Second International Symposium on Riverine Landscapes held in August 2004 Sweden, focusing river restoration. Together these provide an overview science restoration, and point out future research needs. 2. Restoration tests feasibility recreating complex ecosystems more simple degraded states, thereby presenting major challenge to ecological science. Therefore, close cooperation between practitioners...
We used the largest DNA-based phylogeny of flowering plants to date evaluate importance energy vs. past climate change in predicting global patterns diversification. Relative diversification rates increased towards equator, suggesting that differences per-lineage net may be an important component latitudinal diversity gradient. The amplitude Quaternary oscillations experienced by families explained variation equally well compared contemporary measures, and measures were intercorrelated,...
We present a framework distinguishing three principal controls of speciation rate: rate splitting, level persistence, and length duration. contend that discussions on diversification become clearer in the light this framework, because variation could be attributed to any these controls. In particular, we claim role persistence within‐species lineages controlling rates has been greatly underappreciated. More emphasis control would change expectations several biological traits environmental...
Abstract Riparian ecosystems are central elements in many landscapes because of their shape, diversity and function as filters corridors. They also among the environments most disturbed threatened by humans. Human‐induced changes riparian vegetation flora were assessed comparing free‐flowing regulated rivers northern Sweden. Although structure is rather uniform along rivers, it varies distinctly different water‐level fluctuations storage reservoirs, run river impoundments unimpounded but...
The spatial distribution and temporal availability of propagules fundamentally constrain plant community development. This study experimentally tested several hypotheses about the relative roles wind water dispersal in colonization development riparian communities along rivers. Through controlling source (dispersed by wind, water, or both) reaching newly created, bare river margin sites, we isolated other factors over five years. Replicated treatments were established at 12 sites spanning...