Sökning: "species"

Visar resultat 1 - 5 av 4893 avhandlingar innehållade ordet species.

1. 1. Biologisk mångfald i läroböcker i biologi

   Författare :Maria Ferlin; Högskolan i Borås; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; textbooks; biological diversity; social semiotics; multimodality; meaning making; concept; species; species concept; Utbildningsvetenskap med inriktning mot naturvetenskap; Textbooks; Biological diversity; Social semiotics; Multimodality; Meaning making; Concept; Species; Species concept;

   Sammanfattning : The aim of this thesis is to analyse offered meaning, that is, what and how subject content is communicated to the recipients. In this case the subject content is biological diversity and the communicative artefacts are biology books for the latter grades in the Swedish compulsory school. LÄS MER

3. 2. Species Aid : Organizational Sensemaking in a Preservation Project in Albania

   Författare :Peter Green; Gudrun Dahl; Åsa Boholm; Stockholms universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; Conservation; social anthropology; ecological anthropology; global environmental issues; Albania; sensemaking; organisational theory.; Cultural anthropology; Kulturantropologi;

   Sammanfattning : In 1994 a Hungarian fisheries biologist specialised on sturgeons revealed that there was at least one population of sturgeons belonging to the threatened sturgeon species Ac. Naccari still present in the Albanian aquatic fauna. The stage was now set for an international conservation initiative. LÄS MER

4. 3. Integrative taxonomy of birds : Studies into the nature, origin and delimitation of species

   Författare :George Sangster; Per G. P. Ericson; Martin Päckert; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Aves; biogeography; integrative taxonomy; pluralism; ring species; speciation; species criteria; species limits; taxon chain; Systematic Zoology; zoologisk systematik och evolutionsforskning;

   Sammanfattning : Species are the basic currency in biodiversity studies but what constitutes a species has long been controversial. A major breakthough was the insight that most systematists agree that species are segments of population lineages, and that multiple lines of evidence should be employed and integrated, a procedure called integrative taxonomy. LÄS MER

5. 4. Through the magnifying glass - The big small world of marine meiofauna : Morphology, species and evolution in Nemertodermatida

   Författare :Inga Meyer-Wachsmuth; Ulf Jondelius; Mark E Sidall; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Nemertodermatida; Acoelomorpha; morphology; CLSM; Phalloidin; musculature; DNA; cryptic species; species delimitation; dispersal; taxonomy; phylogenetics; IHC; nervous system; Systematic Zoology; zoologisk systematik och evolutionsforskning;

   Sammanfattning : Nemertodermatida is a group of microscopic marine worm-like animals that live as part of the marine meiofauna in sandy or muddy sediments; one species lives commensally in a holothurian. These benthic worms were thought to disperse passively with ocean currents, resulting in little speciation and thus wide or even cosmopolitan distributions. LÄS MER

7. 5. Species Limits, and Evolutionary History of Glassfrogs

   Författare :Santiago Castroviejo-Fisher; Carles Vilà; Jennifer A. Leonard; Miguel Vences; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Amphibia; Anura; Biogeography; Centrolenidae; Diversification; Frogs; Molecular Phylogenetics; Neotropics; Pristimantis; Speciation; Species; Systematics; Taxonomy; Systematics and phylogenetics; Systematik och fylogeni; systematisk zoologi; Systematic Zoology;

   Sammanfattning : Recognizing the mechanisms of speciation and the limits of species is essential to understand the origin of biodiversity and how to conserve it. The general aims of my investigations during my doctoral studies were two-fold: to study evolutionary patterns and processes, and to provide specific and superspecific taxonomic classifications that try to reflect evolutionary history. LÄS MER