Search for dissertations about: "species"

Showing result 1 - 5 of 4051 swedish dissertations containing the word species.

  1. 1. Species Aid : Organizational Sensemaking in a Preservation Project in Albania

    University dissertation from Stockholm : Department of Social Anthropology, Stockholm University

    Author : Peter Green; Gudrun Dahl; Åsa Boholm; [2004]
    Keywords : HUMANIORA; HUMANITIES; Conservation; social anthropology; ecological anthropology; global environmental issues; Albania; sensemaking; organisational theory.; HUMANITIES and RELIGION History and philosophy subjects Ethnology Cultural anthropology; HUMANIORA och RELIGIONSVETENSKAP Historisk-filosofiska ämnen Etnologi Kulturantropologi;

    Abstract : 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. READ MORE

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

    University dissertation from Stockholm : Department of Zoology, Stockholm University

    Author : George Sangster; Per G. P. Ericson; Martin Päckert; [2013]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Aves; biogeography; integrative taxonomy; pluralism; ring species; speciation; species criteria; species limits; taxon chain; Systematic Zoology; zoologisk systematik och evolutionsforskning;

    Abstract : 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. READ MORE

  3. 3. Species Limits, and Evolutionary History of Glassfrogs

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Santiago Castroviejo-Fisher; Carles Vilà; Jennifer A. Leonard; Miguel Vences; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Amphibia; Anura; Biogeography; Centrolenidae; Diversification; Frogs; Molecular Phylogenetics; Neotropics; Pristimantis; Speciation; Species; Systematics; Taxonomy; NATURAL SCIENCES Biology Organism biology Systematics and phylogenetics; NATURVETENSKAP Biologi Organismbiologi Systematik och fylogeni; systematisk zoologi; Systematic Zoology;

    Abstract : 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. READ MORE

  4. 4. Biodiversity and Species Extinctions in Model Food Webs

    University dissertation from Institutionen för fysik, kemi och biologi

    Author : Charlotte Borrvall; Bo Ebenman; Owen Petchey; [2006]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; biodiversity; food webs; redundancy; relaxation time; stability; stochasticity; species deletion; species extinction; NATURAL SCIENCES Biology; NATURVETENSKAP Biologi;

    Abstract : Many of the earth’s ecosystems are experiencing large species losses due to human impacts such as habitat destruction and fragmentation, climate change, species invasions, pollution, and overfishing. Due to the complex interactions between species in food webs the extinction of one species could lead to a cascade of further extinctions and hence cause dramatic changes in species composition and ecosystem processes. READ MORE

  5. 5. Species Limits and Systematics in Some Passerine Birds

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Per Alström; Timothy M. Crowe; [2002]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Organismic biology; Mirafra; Seicercus; Phylloscopus; Motacilla; species concepts; species limits; phylogeny; morphology; vocalisations; mitochondrial DNA; nuclear DNA; incongruence; Organismbiologi; NATURAL SCIENCES Biology Organism biology; NATURVETENSKAP Biologi Organismbiologi; systematisk zoologi; Systematic Zoology;

    Abstract : I use morphological, vocal, molecular, behavioural, ecological and distributional data to re-evaluate the systematics of three passerine bird groups, the Mirafraassamica complex (bush-larks), the genus Seicercus ("spectacled-warblers"; with emphasis on the the S. burkii complex) and the genus Motacilla (wagtails). READ MORE