Samenvatting

Climate change has great ecological consequences for animals. Furthermore, these changes can differ among different geographical areas. In birds it has been found that they can cause mismatches with their food supply as they do not respond to climate change at the same pace. By understanding more about these consequences on a full geographic range, more can be learned about the effects of climate change on birds. In order to accomplish this, a dataset using citizen collected nest records from the eastern bluebird and the mountain bluebird over North-America were received from Nestwatch and analysed using linear regression models. Furthermore, models were created that interacted temperature and year with the breeding parameters in order to see how they progressed in the last twenty years over the geographic range and how they responded to change in temperature.