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. 2014 Jan 17;9(1):e86357. doi: 10.1371/journal.pone.0086357

Table 4. Statistical output for response variables having significant relationships with the gradient of agricultural to urban land use.

Response Variable Effect size Standard error p- value
Native bee visitation 0.963 0.22 <0.01
Morphotype richness 0.27 0.12 0.02
Morphotype Shannondiversity 0.55 0.144 <0.01
Morphotype evenness 0.237 0.069 <0.01

To examine in more detail the effect of anthropogenic land use on bee visitation, we created a continuous variable for land use with an index ranging from agriculture to urban land use based on proportional area of each type within a 500 m radius. Generalized linear mixed models were created with this calculated anthropogenic land use metric, bloom category of flowering patch, observation time period, wind, and temperature as fixed effects and site as a random effect. The morning (AM) observation time period was the model baseline for the categorical variable of observation time. Shannon diversity and evenness were fit with Gaussian distributions while all other variables were fit with Poisson distributions.