Sökning: "Alauda arvensis"
Hittade 5 uppsatser innehållade orden Alauda arvensis.
1. The effect of habitat type on farmland bird populations : In Tarnava Mare Natura2000 reserve, Romania
Master-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildning; Uppsala universitet/Institutionen för ekologi och genetikSammanfattning : 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. LÄS MER
2. Effekten av skyddszoner på antal häckande sånglärkor (Alauda arvensis)
Kandidat-uppsats, SLU/Dept. of EcologySammanfattning : I och med intensifieringen av jordbruket under de senaste 100 åren har jordbruksmiljön utsatts för stora förändringar. Exempelvis har arter som är beroende av jordbruksmark i många fall försatts i en ekologisk fälla. Detta innebär att arter felbedömer habitatkvalitén och föredrar i värsta fall de sämsta habitaten framför de bästa. LÄS MER
3. Effects of unsown patches in autumn-sown fields on Skylark territory densities : a study on skylark plots made in central Sweden
Master-uppsats, SLU/Dept. of EcologySammanfattning : Intensified cultivation of farmland is widely recognized to act negatively on many organisms, including birds as the Skylark (Alauda arvensis). During the last decades, this species has been showing a population decline of about 50-75 percent in northwestern Europe, including Sweden. LÄS MER
4. Effekter av predationsrisk på sånglärkors (Alauda arvensis) habitatval på åkermark
Kandidat-uppsats, SLU/Dept. of EcologySammanfattning : Along with other European farmland birds, the skylark (Alauda arvensis) has declined rapidly since the 1970’s. Between 1975 and 2003, the Swedish population of skylarks declined with 64 %. In Britain, the decline is often explained by alterations in farming practices in general and the shift from spring-sown to winter-sown cereals in particular. LÄS MER
5. Vilken effekt har lärkrutor på ogräsfloran vid ekologisk höstveteodling?
L3-uppsats, SLU/Dept. of Crop Production EcologySammanfattning : This study forms part of the R&D project "Improved survival of bird chicks in organic fields" managed by the Rural Economy & Agricultural society in Uppsala. The skylark (Alauda arvensis) is a species that has decreased drastically in Sweden as a consequence of more intensive cropping. LÄS MER