Search results for " Sahel"
showing 4 items of 4 documents
Broad-front migration leads to strong migratory connectivity in the lesser kestrel (Falco naumanni)
2019
Aim: Migratory animals regularly move between often distant breeding and non‐breeding ranges. Knowledge about how these ranges are linked by movements of individuals from different populations is crucial for unravelling temporal variability in population spatial structuring and for identifying environmental drivers of population dynamics acting at different spatio‐temporal scales. We performed a large‐scale individual‐based migration tracking study of an Afro‐Palaearctic migratory raptor, to determine the patterns of migratory connectivity of European breeding populations. Location: Europe, Africa. Methods: Migration data were recorded using different devices (geolocators, satellite transmi…
Sahelin nälkäkriisin uutisointi : diskurssianalyyttinen tutkimus Helsingin Sanomien ja Ylen uutisoinnista Sahelin ruokakriisistä vuonna 2012
2012
In early 2012 the Sahel area in sub-Saharan Africa was facing shortage in food and millions of people were in risk of hunger. In my Bachelor´s thesis I´m investigating the coverage of the Sahel crisis of 2012 in two Finnish main media; the newspaper Helsingin Sanomat and the online news of Finnish broadcasting company Yle (http://yle.fi/uutiset/). My data was collected between January and September in 2012 and it consisted fifteen different articles. My research method was critical discourse analysis through which I hoped to bring out the hidden structures of the texts and also to see what kind of so-called sahelian reality the writer was describing. My main research questions were: How is …
Different trends of neighboring populations of Lesser Kestrel: Effects of climate and other environmental conditions
2019
The sensitivity of population trends to the climate and environment is generally considered a species-specific trait. However, evidence that populations may show different responses to the climate and environmental conditions is growing. Whether this differential sensitivity may arise even among neighboring populations remains elusive. We compared the trends of two neighboring populations of the Lesser Kestrel Falco naumanni, using data from a 12-year survey of 158 colonies in Sicily, Italy; the two populations inhabiting a lowland and an highland area, respectively. Population trends were modeled through the TRIM algorithms implemented in R (package rtrim). A reversed U-shaped population t…
Evolution des paysages Sahélines au cours des six dernières décennies dans la région de Niamey : de la disparition de la brousse tigrée à l'encroutem…
2010
In the Sahel, the rapid increase of the population during the last decades and the climate variation lead to an important environmental degradation. This work aims to measure the impacts of the human pressure on ecosystem during the six last decades. A diachronic cartography of a 100 km² area close to Niamey was done with aerial photographs (1950 and 1975) and GPS measurements (2009). Results showed that the tiger bush vegetation was completely cleared between 1950 and 2009 while the fallow decreases from 7 % to 1 %. In the sandy valley, the increase of cultivated fields from 20,7 % (1950) to 69,4 % (1975) favoured wind and water erosions which allowed surface soil crusting. Between 1975 an…