Bees’ livelihood depends completely on flowers. The pollen flowers produce is bees’ main and only food source. In turn, bees’ presence is crucial to plants’ reproduction. Without pollinators, most plants would go extinct. That’s why it is in our best interest to keep them both in good health.
‘Features of urban green space favourable for large and diverse bee populations’ is a study published in 2016 on journal Urban Forestry & Urban Greening that examined a number of green areas in the city of Poznan, Poland. Specifically, it sampled eight green spaces located from 250 to 4,900 metres from the city centre. Some of them were located in areas where buildings were really close to each other, others in areas where buildings were more distanced.
Researchers analysed the variety of bee species and plants found in these sites. They registered about 100 species of pollinators. Bee density in the areas analysed ranged from 247 to 614 bees per hectare. Researchers also drew some evidence-based conclusions on best practices regarding urban green space planning.
For bees it is easier to get around the city when they can find larger green spaces in the vicinity of suburban areas. If parks and gardens are too far away from each other, bees will avoid moving between areas. Some species of bees do not fly long distances in the first place. The reason for this is linked to body size. The smaller the bee, the shorter the trips she will take in order to find food. Urban areas not featuring enough green spaces lose on the possibility to increase their biodiversity.