Sökning: "biogeography"

Visar resultat 1 - 5 av 11 uppsatser innehållade ordet biogeography.

  1. 1. Systematics and the evolution of flower symmetry of Posoqueria (Rubiaceae)

    Master-uppsats, Göteborgs universitet / Institutionen för biologi och miljövetenskap

    Författare :Sebastián Giraldo Gómez; [2023-06-14]
    Nyckelord :Posoquerieae; Cinchonoideae; Ixoroideae; Dialypetalanthoideae; Angiosperms 353; target capture; Hybpiper; Pollen Catapult Mechanism.;

    Sammanfattning : The genus Posoqueria is a Neotropical group of shrubs and trees in the coffee family Rubiaceae. Posoqueria is phylogenetically poorly understood and presents several internal taxonomical difficulties. LÄS MER

  3. 2. Lavar i skogsöar i en fragmenterad skogsmiljö

    Kandidat-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Christian Mendez From; [2023]
    Nyckelord :Boreal forest; Fragmentation; Habitat; Lichenes; Island biogeography; Species-area concept.;

    Sammanfattning : Epiphytic lichens are important species in the forest ecosystem. The Swedish forestry model affects them by fragmenting large old continuous forests. These fragments could be used as islands in a test of MacArthur and Wilsons theory of island biogeography. LÄS MER

  4. 3. Utbredning och mångfald av invasiva främmande växtarter i Hällaryds skärgård och deras relation till ö-storlek, habitattyper och mänsklig påverkan : En inventering av invasiva arter i östersjöskärgården

    Kandidat-uppsats, Karlstads universitet/Fakulteten för hälsa, natur- och teknikvetenskap (from 2013)

    Författare :Emma Söderberg; [2023]
    Nyckelord :Ecology; invasive; archipelago; botany; survey; diversity; alien species; biogeography; Ekologi; invasiv; skärgård; botanik; inventering; mångfald; främmande växter;

    Sammanfattning : Invasive alien plant species are a major threat to biodiversity, and they have the ability to quickly disperse to new areas and change ecosystems. Human impact is one of the main causes of spread of invasive species since most species are spread through trade and transport and through horticulture. LÄS MER

  5. 4. Effects of past fragmentation and habitat loss and current management methods on the changes in vascular plant communities. : An evaluation of extinction debt in semi-natural grasslands in Sweden

    Kandidat-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildning

    Författare :Adina Sennblad; [2021]
    Nyckelord :;

    Sammanfattning : Habitat loss and fragmentation are believed to be two of the main reasons for high extinction rates of species, resulting in decreased biodiversity. According to the island biogeography theory, the species richness in a patch, here a semi-natural grassland, is dependent on the landscape composition, and therefore changes in the landscape composition will result in changes in the species richness of the grassland. LÄS MER

  7. 5. Biology and biodiversity of tardigrades in the world and in Sweden : Current status and future visions

    Master-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Niki Andersson; [2017]
    Nyckelord :tardigrade; tardigrada; biology; biodiversity;

    Sammanfattning : Tardigrades are small water-dwelling invertebrates that can live almost anywhere in the world. Even though they are well-known our knowledge about them is still scarce. LÄS MER