This is a subset of the data from Crone and Williams, 2016. Bombus vosnesenskii colonies were placed in sites in a mixed agricultural--natural area in California, USA and weighed weekly.
bombusA data frame with 178 rows and 10 columns
The site ID
The colony ID
The proportion of the habitat for that site classified as wild using GIS
The habitat type. Either wild (W), organic agriculture (O), or conventional agriculture (C)
The calendar date the measurements were taken on
Number of weeks since the initial mass was taken
Colony mass, in grams
Difference in mass from the smallest mass for each colony, in grams
Floral density in millions of flowers within a 2km radius around the colony, weighted as a function of distance from colony
Cumulative floral resources from the start of the study
Floral resources (e) are weighted using the equation w = e^(-D/a) where D is the distance in meters between the resources and the colony and a is the typical flight distance for the species. This is described in further detail in Williams et al. 2012.
Crone, E. E., and Williams, N. M. (2016). Bumble bee colony dynamics: quantifying the importance of land use and floral resources for colony growth and queen production. Ecol. Lett. 19, 460–468. doi:10.1111/ele.12581.
Williams, N. M., Regetz, J., and Kremen, C. (2012). Landscape-scale resources promote colony growth but not reproductive performance of bumble bees. Ecology 93, 1049–1058. doi:10.1890/11-1006.1.