Sökning: "diversity patterns"

Visar resultat 1 - 5 av 272 avhandlingar innehållade orden diversity patterns.

  1. 1. Patterns in diversity : Geochemical analyses and settlement changes during the Iron Age - Early Medieval time in the Lake Mälaren region, Sweden

    Detta är en avhandling från Stockholm : Institutionen för arkeologi och antikens kultur

    Författare :Björn Hjulström; Sven Isaksson; Michael Parker Pearson; ; [2008]
    Nyckelord :HUMANIORA; HUMANITIES; HUMANITIES and RELIGION History and philosophy subjects Archaeology subjects Archaeology; HUMANIORA och RELIGIONSVETENSKAP Historisk-filosofiska ämnen Arkeologiämnen Arkeologi; Archaeological Science; laborativ arkeologi;

    Sammanfattning : The principal aims of this thesis were two-fold, encompassing both a geochemical approach and a focus on the settlement structure of the Lake Mälaren region of Sweden during the first millennium A.D. LÄS MER

  2. 2. Spikemoss patterns Systematics and historical biogeography of Selaginellaceae

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Stina Weststrand; Petra Korall; Michael J. Donoghue; [2016]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; classification; historical biogeography; lycophytes; nomenclature; phylogeny; Selaginella; Selaginellaceae; systematics; fylogeni; historisk biogeografi; klassifikation; lummerväxter; nomenklatur; Selaginella; Selaginellaceae; systematik; Biologi med inriktning mot systematik; Biology with specialization in Systematics;

    Sammanfattning : Selaginellaceae, spikemosses, is a heterosporous plant family belonging to the lycophytes. With an estimated age of some 350 million years, the family is historically important as one of the oldest known groups of vascular plants. Selaginellaceae is herbaceous with a worldwide distribution. However, the majority of the ca. LÄS MER

  3. 3. Diversity Underfoot Systematics and Biogeography of the Dictyostelid Social Amoebae

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Allison L Perrigo; Sandra Baldauf; Maria Romeralo; David Bass; [2013]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Amoeba; biogeography; cryptic species; dictyostelid; latitudinal gradient; multicellularity; protist; social amoeba; phylogenetics; systematics; new species; Biology with specialization in Systematics; Biologi med inriktning mot systematik;

    Sammanfattning : Dictyostelids (Amoebozoa) are a group of social amoebae consisting of approximately 150 species, which are found in terrestrial habitats worldwide. They are divided into eight major clades based on molecular phylogeny, and within these clades are many species complexes. LÄS MER

  4. 4. Ecology of lichens in boreal coniferous forests with reference to spatial and temporal patterns

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Per-Anders Esseen; Lars Ericson; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Lichens; epiphytes; Alectoria; Bryoria; Cladonia; Usnea; Picea abies; Pinus sylvestris; dispersal; litterfall; succession; diversity; spatial patterns;

    Sammanfattning : The thesis deals with the ecology of lichens in two contrasting types of forest, epiphytic lichens in old Picea abies forest of the fi re-refugia type and epigeic as well as epixylic lichens in a successional sequence of fire- susceptible Pinus sylvestris forests. Results in five separate papers form the basis for a discussion of general patterns of dispersal, succession and life strategies in lichens. LÄS MER

  5. 5. Mutation and Diversity in Avian Sex Chromosomes

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Hannah Sundström; Hans Ellegren; David W. Burt; [2003]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Genetics; mutation rate; diversity; sex chromosomes; indels; male bias; selective sweep; effective population size; birds; Genetik; MEDICINE Dermatology and venerology; clinical genetics; internal medicine Clinical genetics; MEDICIN Dermatologi och venerologi; klinisk genetik; invärtesmedicin Klinisk genetik;

    Sammanfattning : Sex chromosomes are useful for the study of how factors such as mutation, selection, recombination and effective population size affect diversity and divergence.A comparison of gametologous introns in seven different bird species revealed a complete lack of diversity on the female-specific W chromosome. LÄS MER