06/05/2024
It doesn’t pay to be rich if you want bee diversity
A new study from CU Boulder has found that wealthier neighborhoods in Boulder County tend to have fewer varieties of bees compared to their middle-income counterparts. One reason, the study suggests, is that wealthier areas often have more impervious surfaces that prevent rainwater from seeping into the ground. These neighborhoods also have more mature trees, which are beneficial for temperature regulation but not for native pollinators when most of those trees are non-native species. One way to counteract this trend is to plant more native vegetation.
Wealthier areas also tend to use more pesticides, fertilizers and mulch, disrupting the natural balance of soils, the study found.
“Most of the bees found in these gardens, such as long-horn bees and squash bees, nest in the ground, so they are sensitive to changes in the soil,” said Asia Kaiser, a doctoral student in the Department of Ecology and Evolutionary Biology at CU Boulder and the study’s lead author.
Last spring, the team planted approximately 70 jalapeño pepper plants in seven large community gardens across Boulder and Louisville. Using traps, they collected over 3,000 insects and other arthropods, including spiders, from the gardens.
The study’s findings contradict previous research suggesting that wealthier neighborhoods, with increased green space, tend to have more animal biodiversity. This study did find that some insects, such as beetles, thrived in wealthier areas, but these pests are not effective pollinators.
The impact of the pollinators was evident, as plants in the middle-income gardens produced larger fruits than those in wealthier areas. It turns out pest beetles aren’t doing much pollinating.