Sökning: "bird migration"

Visar resultat 1 - 5 av 21 uppsatser innehållade orden bird migration.

1. 1. Temporary Halting of Wind Turbine Rotors toMitigate Effects on Birds

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

   Författare :Ola Hedberg; [2024]
   Nyckelord :Bird; mitigation; effect; wind farm; turbine; wind power; halting; collision; risk; birds; power; generation;

   Sammanfattning : This study assesses the viability of temporarily halting wind turbine operations as amitigation measure to protect bird populations during migration periods. Conducted in thenorthern Baltic, it examines the migration patterns, timings, and altitudes of various birdspecies, aiming to identify the most critical times for implementing turbine stoppages. LÄS MER

3. 2. Sparvugglans (Glaucidium passerinum) invasioner vid Hammarö Fågelstation, Värmland

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

   Författare :Amanda Odénius Hedman; [2023]
   Nyckelord :invasion; irruptions; irruptive migration; ecology; behavior; bird migration; eurasian pygmy own; glaucidium passerinum; Invasion; migration; beteende; ekologi; fågelmigration; sparvuggla; glaucidium passerinum; migrationsmönster;

   Sammanfattning : Sparvugglan (Glaucidium passerinum) är en invasionsfågel som uppvisar årliga fluktuationer i sina invasioner vid Hammarö Fågelstation. Invasioner av denna art utlöses vanligtvis av brist på föda tidigt under hösten, vilket kan orsaka att hundratals fåglar migrerar på ett oförutsägbart sätt. LÄS MER

4. 3. The perfect wing, The perfect trade-off? : What implements the main selection pressure on wing morphology?

   Master-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildning

   Författare :Emme MacDonald; [2023]
   Nyckelord :Bird; wing morphology; migration; habitat; aspect ratio; wing loading;

   Sammanfattning : Selection pressure is a constant force in evolution, pushing birds and their wings towards an optimal shape and structure, were increasing performance, and minimizing the costs is central. But even though the science of aerodynamics can provide calculations of the optimal construction for the wing in different situations this rarely directly correspond to what is observed in nature. LÄS MER

5. 4. Conservation Genomics of the Long-tailed Duck

   Master-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildning

   Författare :Brynhildur Magnúsdóttir; [2021]
   Nyckelord :Long-tailed duck; migration; conservation; population structure; genome;

   Sammanfattning : With increasingly warming climate, many bird species have been forced to respond to environmental changes, and the long-tailed duck (Clangula hyemalis) is no exception. The populations of the long-tailed duck have been in decline the past few decades and the species is classified as globally vulnerable and near threatened in both Iceland and Sweden. LÄS MER

7. 5. Geografisk segregering under vintertid hos rödhake (Erithacus rubecula)

   Kandidat-uppsats, Linköpings universitet/Institutionen för fysik, kemi och biologi

   Författare :David Ek; [2020]
   Nyckelord :Bird migration; Climate change; Erithacus rubecula; European Robin; Segregation; Wintering area;

   Sammanfattning : Segregation, that animals of different sex and/or age do not spend time together all year round, is a common phenomenon. One example is that males and older individuals in migratory birds wintering further north. Migration time also affects the distribution of birds in the wintering area. LÄS MER