Comparing urban sites to farmland and nature reserves, a team of British researchers found good reason to promote urban areas for their value in conserving and restoring pollinator populations. Net/net urban areas are good for bee species richness although the community of flower visitors was more homogeneous—there were fewer of other types of pollinators. They found that rare species were just about as likely to be found in urban areas as they were in farmland or nature reserves. “…identifying good urban habitats for pollinators and improving their value for pollinators should be part of any strategy to conserve and restore pollinators.”
Moral of the story: Keep planting pollinator habitat in urban managed landscapes, it makes a difference.