Sökning: "gastropods"

Hittade 4 uppsatser innehållade ordet gastropods.

  1. 1. Body patterning and cognition in cephalopods - a literature review

    Master-uppsats, SLU/Dept. of Animal Environment and Health

    Författare :Georgina Chu; [2023]
    Nyckelord :cephalopods; octopus; body patterning; colour alteration; chromatophores; pigment cells; cognition; learning and memory;

    Sammanfattning : Cephalopods are a valuable model for studying the evolution of cognition due to their distinctive brain structure, organisation, and connectivity patterns compared to vertebrates. The development of large brains and behavioural complexities are believed to be triggered by evolutionary pressures stemming from factors like heightened predation, more demanding foraging conditions, and intense mating competition. LÄS MER

  3. 2. An Investigation into Predation, Mortality and Taphonomic Bias inthe Population Distribution of Neptunea contraria from theRed Crag of East Anglia

    Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Alexander Seale; [2016]
    Nyckelord :Predation; taphonomy; sampling bias; palaeobiology; gastropods; population distribution; Predation; tafonomi; provtagning snedhet; paleobiologi; snäckor; populationsfördelning;

    Sammanfattning : Predation is a key factor in evolutionary dynamics. It disrupts the potential of fossilisation in prey items and is poorly recorded in the fossil record; failed predation in conical marine gastropods is recorded in scars. LÄS MER

  4. 3. Middle-Upper Ordovician trilobites and stratigraphy along the Kyrkbäcken rivulet in the Röstånga area, southern Sweden

    Magister-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Christian Pålsson; [1995]
    Nyckelord :Middle-Upper Ordovician; Röstånga; Kyrkbäcken rivulet; stratigraphy; 1ithology; taxonomy; trilobites; Skagen Limestone; Sularp Shale; Mossen Fm; Jerrestad Formation; Earth and Environmental Sciences;

    Sammanfattning : Middle-Upper Ordovician strata are well exposed along the Kyrkbäcken rivulet in the Röstånga area of Scania. The investigated sequence dips about 40° towards the south, and comprises about 26 m of strata. It consists largely of siliceous limestones, mudstones, shales, and bentonites. LÄS MER

  5. 4. Stratigrafisk och faunistisk undersökning av Vitabäckslerorna i Skåne

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Jonas Ekström; [1985]
    Nyckelord :geologi; geografi; Skåne; Sweden; gastropods; ostracods; brackish water assemblages; Jurassic - Cretaceous boundary; bivalves; molluscs; Vitabäckslera; Earth and Environmental Sciences;

    Sammanfattning : The Vitabäck clays, the Jurassic - Cretaceous transitionai beds in Sweden, contain brackish water faunas with close affinities to their counterparts in north-western Europe. The faunas are dominated by the bivalve genera Myrene and Neomiodon. There is no evidence for limnic or marine conditions, which previously has been assumed. LÄS MER