How urban heat affects bee populations
(PHYSorg.com Biology)

North Carolina is home to 500 species of wild bees, yet only a subset of these are common in cities and suburbs. People encourage wild bees by planting flowers and creating pollinator gardens to provide the pollen and nectar bees need. However, even gardens rich with flowers do not have the same bee abundance or diversity as natural areas. So, there must be things besides flowers that limit urban bee communities. But what are they?