shadoj's Identifications

Traveling Survey. Found on 1-hour long Bombus survey over a meandering transect. Number of each species and sex/caste as well as floral interactions recorded during survey. Habitat: weedy field with volunteer rye from previous growing season when rye was harvested; any remaining seed that germinated in the fall was left as a cover crop, so not seeded since harvest; to be herbicided and planted to no-till corn within the coming week. Broadly surrounded by agriculture and deciduous forest. Flowering plant species at time of survey: Viola sororia (uncommon), Thlaspi arvense (uncommon), Taraxacum sp. (abundant). Time: 16:05-17:05. Survey conditions: mostly cloudy, breezy, 70F. Species present were: B. impatiens (24Q-f; 1Q-ns), B. pensylvanicus (1Q-f), B. auricomus (1Q-f), B. griseocollis (19Q-f), B affinis (2Q-f), B. bimaculatus (9Q-f; 1Q-ns), B. vagans (2Q?-f). Flyovers included: B. auricomus (1Q), B. impatiens (1Q). Later searching in nearby area in same habitat yielded additional griseocollis Q, impatiens Q, a few bimaculatus Q, and 1 auricomus Q. For B. affinis, 2 Q foraging.