Sökning: "gradual evolution"

Visar resultat 1 - 5 av 42 avhandlingar innehållade orden gradual evolution.

  1. 1. Predator psychology and mimicry evolution - a theoretical analysis

    Detta är en avhandling från Stockholm : Department of Zoology, Stockholm University

    Författare :Alexandra Balogh; Olof Leimar; Michael Speed; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Müllerian mimicry; two-step evolution; gradual evolution; mutualism; predator psychology; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology Ethology and behavioural ecology; NATURVETENSKAP Biologi Terrestrisk; limnisk och marin ekologi Etologi och beteendeekologi; etologi; Ethology;

    Sammanfattning : The evolution of Müllerian mimicry depends on many factors, among which predator psychology is the most important one. Predator avoidance learning, generalization and discrimination are primary selective agents during the evolutionary process. LÄS MER

  2. 2. Insights into the Evolution of Moth Pheromone Communication: Lessons from the European Corn Borer

    Detta är en avhandling från Chemical Ecology and Ecotoxicology, Department of Biology, Lund University

    Författare :Jean-Marc Lassance; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; biosynthetic enzymes; evolution; Ostrinia nubilalis; mate choice; mate finding; olfaction; biosynthesis; speciation; moth; pheromone; olfactory receptors.;

    Sammanfattning : Chemical communication by means of sex pheromones is central to the mating systems of a wide range of organisms. Because reproductive isolation is often based on pheromone differences, understanding how pheromones diverge is necessary for a complete comprehension of the speciation process. LÄS MER

  3. 3. Evolution of Mimicry and Aposematism Explained: Salient Traits and Predator Psychology

    Detta är en avhandling från Stockholm : Department of Zoology, Stockholm University

    Författare :Baharan Kazemi; Olof Leimar; Gabriella Gamberale-Stille; Mike Speed; [2017]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; imperfect mimicry; mimicry evolution; predator learning; discrimination; generalization; salience; overshadowing; aposematism; warning signal evolution; generalization bias; peak shift; etologi; Ethology;

    Sammanfattning : Aposematic species have evolved conspicuous warning signals, such as bright colors and striking patterns, to deter predators. Some edible and harmless species take advantage of this deterrent effect by mimicking their appearance. Mimicry is a great example of how natural selection produces remarkable adaptations. LÄS MER

  4. 4. Evolution of cellular complexity and other remarkable features in Gemmataceae Complex bacterial lineages defy prokaryotic trends

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Mayank Mahajan; Siv G. E. Andersson; James O. McInerney; [2019]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Molecular evolution; Planctomycetes; Gemmataceae; functional organization; signalling; protein interaction; peptidoglycan; membranes; cell division; radiation tolerance; Pfam; SCOP; comparative genomics; protein architecture; domain shuffling and orthologous clustering; Bioinformatics; Bioinformatik; Biologi med inriktning mot molekylär evolution; Biology with specialization in Molecular Evolution; Biology with specialization in Molecular Biology; Biologi med inriktning mot molekylärbiologi;

    Sammanfattning : Bacteria of the family Gemmataceae belong the phylum Planctomycetes and are remarkable because of their complex cellular architectures, previously considered to be traits exclusive to eukaryotes. This thesis provides clues to the atypical cell envelope, the enhanced radiotolerance and the amazing cellular complexity of these bacteria. LÄS MER

  5. 5. Expectations and Linguistic Meaning

    Detta är en avhandling från Lund University Cognitive Science Kungshuset, LundagårdSE-222 22 LUND [email protected]

    Författare :Simon Winter; [1998]
    Nyckelord :HUMANIORA; HUMANITIES; Philology; covariation; linguistic meaning; cognition; expectations; evolution; conventionalization; pragmatics-semanticscontinuum; dialogue dynamics; shareability; referentialcommunication; ontology; deontic and epistemic modality; breakdown analysis; Språkvetenskap;

    Sammanfattning : What is the relation between the words in language and our everyday actions? Are linguistic structures dependent on our actions, or does language function on its own? This thesis deals with the pragmatic foundations of language and proposes a model of meaning in language that is based on our expectations about the world and about other people. On this view, language is seen as composed of three functional layers of pragmatics, semantics and morpho-syntax, with each layer having a certain autonomy: semantics captures useful generalizations from the pragmatic level, and morpho-syntax captures generalizations from the semantic level. LÄS MER