Bumble bees (Bombus spp.) are among the most important wild pollinators, contributing significantly to ecosystem health and stability. However, due to habitat loss, climate change, and the continuous increase of pesticide use, many species have experienced population declines. Eau Claire, WI, has been reported as home to 15 Bombus spp. including the endangered Rusty Patched Bumble bee (Bombus affinis), making it an important location for bumble bee conservation. This study aims to characterize foraging behavior and preferences of local Bombus species to improve our understanding of preferred food plants to support conservation. To do this, a 12-week field study monitored bumblebee abundance and available flowers at three locations around Eau Claire. By conducting timed field surveys at each location each week and noting flowers visited, we evaluated species presence and abundance and created a flower-Bombus interaction network. Over 177 surveys conducted, 13 different species of Bombus were observed. Each species of Bombus observed had unique peaks in abundance and responses to ambient temperature. 50 different species of flowers were visited by bumble bees over the surveying period (June-September), with the most visited species being Monarda fistulosa. Knowing the bumble bees diet preferences can inform pollinator planting practices in Western WI.
