Thus, we statistically corrected our estimates of infection status prior to analysis by controlling for the highly significant influence of sampling effort (estimated by the number of studies that described the parasites of each host; raw species data: coefficient = 1.43, s.e. = 0.284, t 10 = 4.03, P = 0.002; contrasts: coefficient = 1.275, s.e. = 0.286, t 10 = 4.45, P = 0.001).
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