Energy expenditure during egg laying is equal for early and late breeding free-living female great tits

In many bird populations, variation in the timing of reproduction exists but it is not obvious how this variation is maintained as timing has substantial fitness consequences. Daily energy expenditure (DEE) during the egg laying period increases with decreasing temperatures and thus perhaps only females that can produce eggs at low energetic cost will lay early in the season, at low temperatures. We tested whether late laying females have a higher daily energy expenditure during egg laying than early laying females in 43 great tits (Parus major), by comparing on the same day the DEE of early females late in their laying sequence with DEE of late females early in their egg laying sequence. We also validated the assumption that there are no within female differences in DEE within the egg laying sequence. We found a negative effect of temperature and a positive effect of female body mass on DEE but no evidence for differences in DEE between early and late laying females. However, costs incurred during egg laying may have carry-over effects later in the breeding cycle and if such carry-over effects differ for early and late laying females this could contribute to the maintenance of phenotypic variation in laying dates

Religious regimes: rethinking the societal role of religion in post-war Europe

© 2015 Cambridge University Press.This article discusses the concept of 'religious regimes' in order to identify institutionalised arrangements regulating the social position of religion. By analysing such regimes and the views underpinning them, three visions of the societal role of religion come into focus: segmented pluralism, the Christian nation and the secular nation. Taking up Dutch post-war history as a case study, it becomes clear that religious regimes regularly result from fragile compromises. The concept thus yields insight into the gradual transitions between different institutional arrangements regarding religion and into the impact of changing views on the societal role of religion within and outside religious communities