Essays about: "bird occurrence"
Showing result 1 - 5 of 11 essays containing the words bird occurrence.
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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 miljövetenskapAbstract : 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
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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 genetikAbstract : 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
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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 HealthAbstract : 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
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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 StudiesAbstract : 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
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5. Bird biodiversity in relation to forest composition in Sweden
University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskapAbstract : 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