Essays about: "Wiener index"

Showing result 1 - 5 of 7 essays containing the words Wiener index.

  1. 1. The effects of management practices and environmental variables on the biodiversity of Nardus grasslands in the national park Hohe Tauern, Austria

    University essay from SLU/Dept. of Ecology

    Author : Rebecca Paulina Dörner; [2023]
    Keywords : biodiversity; Nardus stricta; Nardus grassland; national park Hohe Tauern; East Tyrol; alpine pastures;

    Abstract : Introduction. A large part of the biodiversity of the Alps is linked to an interaction between the natural environment and traditional land-use practices. This study focuses on the priority habitat type of species rich Nardus grasslands (Natura 2000 Code 6230*), which is endangered, but continues to thrive in extensively managed subalpine pastures. READ MORE

  3. 2. Distances in random trees

    University essay from Uppsala universitet/Sannolikhetsteori och kombinatorik

    Author : Jacob Lundblad; [2023]
    Keywords : Random trees; simply generated trees; recursive trees; plane oriented recursive trees; PORTs; Wiener index; internal path length;

    Abstract : The Wiener index of a graph G is defined as the sum of the distances between all pairs of vertices in G. In this master thesis we introduce recursive trees, plane oriented recursive trees (PORTs) and simply generated trees. READ MORE

  4. 3. Blädningsbrukets påverkan på biologisk mångfald : effekten på kärlväxters biodiversitet och specifikt förekomsten av blåbär

    University essay from SLU/Dept. of Forest Ecology and Management

    Author : Erik Hallgren; Anna Sandberg; [2022]
    Keywords : blädningsbruk; hyggesfritt skogsbruk; kärlväxter; blåbär; Vaccinium myrtillus; artrikedom; biodiversitet;

    Abstract : The utilization of the Swedish forest as a natural resource has intensified during the last decade, which has led to an increase in disturbances on the forest ecosystems as a result of clear cutting. The effect of forestry on species richness and species composition has a large impact on how well the biodiversity and ecological communities can function. READ MORE

  5. 4. Macroinvertebrate sampling in hydropeaking rivers : Testing Hester-Dendy samplers in a laboratory environment using different flow conditions

    University essay from Karlstads universitet/Avdelningen för biologi

    Author : Mattias Hansson; [2020]
    Keywords : hydropower; bioassessment; benthic macroinvertebrates; biotic indicator; vattenkraft; biologiska bedömningsgrunder; bentiska makroevertebrater; bioindikator;

    Abstract : Degraded rivers and streams caused by disturbances have created a need for reliable tools to assess the ecological status of such ecosystems. Numerous methods and programs have been developed to assess ecological status using biological indicators, benthic macroinvertebrates are the most commonly used biotic indicator. READ MORE

  6. 5. Nocturnal moths use of novel habitats : a case study on a power line in a forest-mire mosaic in boreal Sweden

    University essay from SLU/Dept. of Wildlife, Fish and Environmental Studies

    Author : Oskar Lövbom; [2020]
    Keywords : pollinators; Lepidoptera; moth; transmission line; assemblage structure; Noctuoidea; Geometridae;

    Abstract : Biodiversity and pollinators are declining all over the world, and a factor thought to cause this decline is destruction of natural habitats. One new way that has been discussed in an effort to try to mitigate the effects of declining habitats is to understand and use novel habitats, which are habitats created when, for example, building roads, railways, and power lines. READ MORE