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Bombus vosnesenskii colony growth and estimated floral resources
Description
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.
Usage
bombus
Format
A data frame with 178 rows and 10 columns
- site
The site ID
- colony
The colony ID
- wild
The proportion of the habitat for that site classified as wild using GIS
- habitat
The habitat type. Either wild (W), organic agriculture (O), or conventional agriculture (C)
- date
The calendar date the measurements were taken on
- week
Number of weeks since the initial mass was taken
- mass
Colony mass, in grams
- d.mass
Difference in mass from the smallest mass for each colony, in grams
- floral_resources
Floral density in millions of flowers within a 2km radius around the colony, weighted as a function of distance from colony
- cum_floral
Cumulative floral resources from the start of the study
Details
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.
References
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.