Essays about: "bird occurrence"

Showing result 1 - 5 of 11 essays containing the words bird occurrence.

  1. 1. Estimating historic ranges of extinct scavenging birds from North America during the late Pleistocene using co-occurrence data from the fossil record

    University essay from Göteborgs universitet / Institutionen för biologi och miljövetenskap

    Author : Melissa Miranda; [2023-06-30]
    Keywords : Scavenging birds; Vultures; Co-occurrence Data; Range Estimates; Spatial Autoregressive Models; Co-extinction;

    Abstract : The aim of my study was to estimate and compare the historic range of nine scavenging birds from North America that went jointly extinct with their mammalian megafaunal prey in the Late Pleistocene. Although the severity and timing of their co-extinction are strongly correlated, there has been little analytical support in providing estimates for the possible geographic distribution of scavenging birds prior to the extinction event. READ MORE

  3. 2. The effect of habitat type on farmland bird populations : In Tarnava Mare Natura2000 reserve, Romania

    University essay from Uppsala universitet/Institutionen för biologisk grundutbildning; Uppsala universitet/Institutionen för ekologi och genetik

    Author : Krisztina Csiki; [2020]
    Keywords : farmland; birds; agriculture; Tarnava; Mare; Natura2000; reserve; yellowhammer; tree sparrow; skylark; red-backed shrike; common whitethroat;

    Abstract : Widespread extinction is a critical threat to biodiversity and is largely caused by human overexploitation of habitat and populations. A widely used and hence well studied organism group for indication of biodiversity is birds. READ MORE

  4. 3. Metoder för övervakning av West Nile virus : exempel på integrerad veterinär- och humanmedicin

    University essay from SLU/Dept. of Biomedical Sciences and Veterinary Public Health

    Author : Julia Heyman; [2017]
    Keywords : West Nile virus; övervakning; folkhälsa; seroprevalens; sentinel; vektor; West Nile virus; surveillance; public health; seroprevalence; sentinels; vectors;

    Abstract : West Nile virus är ett vektorburet RNA-virus som i naturen vidmakthålls i en transmissionscykel mellan myggor och fåglar. I vektorerna amplifieras viruset och vid blodmål kan fåglar infekteras och då uppnå tillräckligt hög viremi för att andra myggor ska smittas. Den myggart som oftast är bärare av viruset är Culex pipiens. READ MORE

  5. 4. Ecological requirements of the threetoed woodpecker (Picoides tridactylus L.) in boreal forests of northern Sweden

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

    Author : Michelle Balasso; [2016]
    Keywords : three-toed woodpecker; dead wood; dead spruce; snags; habitat requirements; boreal forest; forest management;

    Abstract : The three-toed woodpecker (Picoides tridactylus L.) is a forest specialist bird, highly dependent on dead and decaying trees for foraging. I investigated the occurrence of the three-toed woodpecker in relation to vegetation characteristics including dead wood in the boreal forests of northern Sweden. READ MORE

  6. 5. Bird biodiversity in relation to forest composition in Sweden

    University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Author : Annabelle Finck; [2015]
    Keywords : timber production; bird biodiversity; indicator species; forest composition; bird occurrence; Physical Geography and Ecosystems Science; Earth and Environmental Sciences;

    Abstract : The large development of timber activities in Sweden has induced important changes in forest composition. Today they are less old, deciduous trees and snags in Swedish forests. Such changes threaten the survival of certain bird species in Sweden. READ MORE