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Success rate of amplifying the LW Rh gene in bumble bee specimens of different ages. General linear modeling (binomial errors: dependent variable, success rate; independent variable, year of specimen collection) showed that year as an independent variable contributed little to model fit (regression coefficient = 0.0182, P = 0.814). Except for 2004, when only three bees were screened, four bees were screened in each study year.
