Sökning: "Natural Sciences Biological Sciences Ecology"

Visar resultat 1 - 5 av 1388 avhandlingar innehållade orden Natural Sciences Biological Sciences Ecology.

  1. 1. Learning-by-modeling : Novel Computational Approaches for Exploring the Dynamics of Learning and Self-governance in Social-ecological Systems

    Författare :Emilie Lindkvist; Maja Schlüter; Jon Norberg; Örjan Ekeberg; James Dyke; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Complex adaptive systems; Renewable resources; Adaptive management; Small-scale fisheries; Artificial intelligence; Reinforcement learning; Agent-based modeling; agent-baserade modeller; artificiell intelligens; social-ekologiska system; komplexa adaptiva system; förnyelsebara naturresurser; adaptiv förvaltning; Sustainability Science; vetenskap om hållbar utveckling;

    Sammanfattning : As a consequence of global environmental change, sustainable management and governance of natural resources face critical challenges, such as dealing with non-linear dynamics, increased resource variability, and uncertainty. This thesis seeks to address some of these challenges by using simulation models. LÄS MER

  3. 2. Genomic and morphological diversity of marine planktonic diatom-diazotroph associations : a continuum of integration and diversification through geological time

    Författare :Andrea Caputo; Rachel Ann Foster; Monika Quinones Winder; Ramon Massana; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; phytoplankton; diatoms; cyanobacteria; diazotrophs; symbiosis; evolution; phylogenetics; confocal microscopy; qPCR; CARD-FISH; tropics; sub-tropics; Marine Ecology; marin ekologi;

    Sammanfattning : Symbioses between eukaryotes and nitrogen (N2)-fixing cyanobacteria (or diazotrophs) are quite common in the plankton community. A few genera of diatoms (Bacillariophyceae) such as Rhizosolenia, Hemiaulus and Chaetoceros are well known to form symbioses with the heterocystous diazotrophic cyanobacteria Richelia intracellularis and Calothrix rhizosoleniae. LÄS MER

  4. 3. Transcriptional biomarkers of toxicity – powerful tools or random noise? : An applied perspective from studies on bivalves

    Författare :Gustaf Magnus Oskar Ekelund Ugge; Olof Berglund; Annie Jonsson; Helena Westerdahl; Mikael Ejdebäck; Bruno Nunes; Högskolan i Skövde; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Biomarkers; Bivalves; Bivalvia; Ecotoxicology; Environmental toxicology; Environmental risk assessment; RT-qPCR; qPCR; Quantitative PCR; Systematic review; Meta-analysis; Dose-response relationships; Concentration-response relationships; Heavy metals; Metals; General toxicity; Copper; Duck mussel; Anodonta anatina; Freshwater; Gene transcription; Biomarkörer; Musslor; Bivalvia; Ekotoxikologi; Miljötoxikologi; Miljöriskbedömning; RT-qPCR; qPCR; Kvantitativ PCR; Systematic review; Metaanalys; Dos-responssamband; Koncentration-responssamband; Tungmetaller; Metaller; Allmän toxicitet; Koppar; Allmän dammussla; Anodonta anatina; Sötvatten; Gentranskription; Ekologisk modellering; Ecological Modelling Group; Biomarkörer; Musslor; Bivalvia; Ekotoxikologi; Miljötoxikologi; Miljöriskbedömning; RT-qPCR; qPCR; Kvantitativ PCR; Systematic review; Metaanalys; Dos-responssamband; Koncentration-responssamband; Tungmetaller; Metaller; Allmän toxicitet; Koppar; Allmän dammussla; Anodonta anatina; Sötvaten; Gentranskription; Biomarkers; Bivalves; Ecotoxicology; Environmental toxicology; Environmental risk assessment; Quantitative PCR; Meta-analysis; Dose-response relationships; Concentration-response relationships; Heavy metals; Metals; General toxicity; Copper; Duck mussel; Freshwater; Gene transcription;

    Sammanfattning : Aquatic organisms are constantly at risk of being exposed to potentially harmful chemical compounds of natural or anthropogenic origin. Biological life can for instance respond to chemical stressors by changes in gene expression, and thus, certain gene transcripts can potentially function as biomarkers, i.e. LÄS MER

  5. 4. Ticks - ecology, new hazards, and relevance for public health

    Författare :Thérese Janzén; Monica Hammer; Patrik Dinnétz; Mona Petersson; Lars Korslund; Södertörns högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Baltic Sea region; eco-epidemiology; habitat; Ixodes persulcatus; Ixodes ricinus; landscape; risk; urbanization; Environmental Studies; Miljövetenskapliga studier; Östersjö- och Östeuropaforskning; Baltic and East European studies;

    Sammanfattning : Ticks and tick-borne diseases are ranking second only to mosquitoes as vectors of pathogens responsible for diseases in both humans and domestic animals. In the countries around the Baltic Sea, two medically important tick species are increasing both in range and abundance, and the public health threat posed by tick-borne diseases in this area is steadily growing. LÄS MER

  7. 5. Optimal strategies and information in foraging theory

    Författare :Emma Sernland; Högskolan i Skövde; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Bayesian foraging; information use; public information; prior information; negative binomial distribution; group foraging; decision-making; information updating; leaving strategy; Ecology; Ekologi; NATURAL SCIENCES; NATURVETENSKAP; Other biology; Övrig biologi; Naturvetenskap; Natural sciences; information use; Bayesian foraging; public information; prior information; negative binomial distribution; group foraging; decision-making; information updating; leaving strategy; Ecology; Ekologi;

    Sammanfattning : In this thesis, I present both theoretical and empirical work where we have studied how humans and animals use information in situations where they need to continually update their information on the density of a resource. We have found that the amount of information, and the way the information is presented, are important factors for how well decisions are adapted to current circumstances. LÄS MER