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In the context of worldwide biodiversity and wild bee decline, it is increasingly important to better understand the effect of land-use changes on wild bee communities at a global scale. To do so, we studied the effect of city area and urban green spaces layout on wild bee species richness and community composition, as well as on wild bee species with an unfavorable UICN conservation status. This study was based on a large European dataset encompassing 20 cities from France, Belgium and Switzerland. We found a mean wild bee species richness in cities of 96 ± 48 (SD), showing that this species richness was highly variable among cities. The main factor positively influencing wild bee species richness in cities was the area of the city. Conversely, species richness was not significantly related to the total area of urban green spaces in a given city, measured as the spatial extent of urban parks, wastelands and other semi-natural habitats, excluding urban private gardens. Species with conservation status were quite scarce in urban environments, especially when compared to the European Red List of Bees, and we could not link their presence to either city or urban green space area. Dissimilarities in wild bee species community compositions were not associated with any of the studied characteristics of cities. We found that the dissimilarity of wild bee community composition among cities was mainly driven by the rarest species, as the most common ones were found in a majority of the cities sampled. Overall, these results emphasize that larger cities host more wild bee species, but are no refuge for the ones with concerning conservation status. Thus, stakeholders are encouraged to design their cities in favor of biodiversity to better support wild bee communities, and perhaps mitigate the established effect of the urban ecological filter. [ABSTRACT FROM AUTHOR]

The premise of our research paper is that large (by the size of the population) municipalities are more complex to govern and manage, and this, in turn, calls for a more professional and apolitical local government. Using data from the largest European survey of mayors, we analyzed the influence of mayors and chief administrative officers in Europe and checked for correlations with the size of the local government. We present empirical evidence to support that the perceived influence of mayors varies with the size of the municipality regardless of the institutional configuration of power relationships. We found that very large municipalities (80,000 or more inhabitants) had weaker mayors. The presumption that a larger, more complex local (urban) environment calls for more professional leadership has been addressed in numerous publications; however, the answer was usually beyond the reach of the empirical tests. [ABSTRACT FROM AUTHOR]

The objective of this study was to examine, across 22 countries, the association between community size and individual sport, team sport, and exercise participation. Hierarchal non-linear Bernoulli modeling is used to examine the association between community size (100,000-10,000; <10,000) and (a) individual sport, (b) team sport, and (c) exercise participation. After controlling for country-level clustering and demographic variables, those residing a community with between 100,000 and 10,000 residents are more likely to participate in individual sport [odds ratio (OR) = 1.14; 95% confidence interval (CI) = 1.05-1.23] while residing in a community with less than 10,000 residents is unrelated (OR = 1.06; 95% CI = 0.96-1.19). Those residing in communities with between 100,000 and 10,000 residents were more likely to participate in team sport (OR = 1.21; 95% CI = 1.01-1.45) while residing in a community with less than 10,000 residents is unrelated (OR = 1.02; 95% CI = 0.88-1.18). Residing in a community with between 100,000 and 10,000 residents is unrelated to exercise participation (OR = 0.97; 95% CI = 0.89-1.7), while residing in a community with less than 10,000 residents is negatively related to exercise participation (OR = 0.86; 95% CI = 0.79-0.93). These findings provide novel evidence that communities between 100,000 and 10,000 residents are related to increased sport participation, particularly team sport participation., (© 2015 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.)