Sökning: "Nigel Hughes"

Hittade 2 avhandlingar innehållade orden Nigel Hughes.

  1. 1. The morphology and evolutionary significance of the anomalocaridids

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Allison C. Daley; Graham E. Budd; Nigel C. Hughes; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; anomalocaridids; Cambrian; Burgess Shale; exceptional preservation; palaeontology; NATURAL SCIENCES Earth sciences Exogenous earth sciences Historical geology and palaeontology; NATURVETENSKAP Geovetenskap Exogen geovetenskap Historisk geologi och paleontologi; Historical Geology and Paleontology; Historisk geologi och paleontologi;

    Sammanfattning : Approximately 600 to 500 million years ago, a major evolutionary radiation called the “Cambrian Explosion” gave rise to nearly all of the major animal phyla known today. This radiation is recorded by various fossil lagerstätten, such as the Burgess Shale in Canada, where soft-bodied animals are preserved in exquisite detail. LÄS MER

  2. 2. Morphometric analysis of Cambrian fossils and its evolutionary significance

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Illiam Jackson; Graham Budd; Jorijntje Henderiks; Richard Mann; Nigel Hughes; [2017]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Extended Evolutionary Synthesis; phenotypic plasticity; genetic assimilation; phenotypic accommodation; Agnostus pisiformis; Mackinnonia; elliptical fourier analysis; species concept;

    Sammanfattning : The Extended Evolutionary Synthesis (EES) is currently emerging as a theoretical alternative to the Modern Synthesis (MS) in which to frame evolutionary observations and interpretations. These alternative frameworks differ fundamentally in their understanding of the relative roles of the genotype, phenotype, development and environment in evolutionary processes and patterns. LÄS MER