Sampling and grazing beating statistics.

★The total duration of sampling/grazing divided by the observation time. ♦Values corrected for differences in prey cell concentration. •For a normally-distributed variable, a domain consisting of ± standard deviation from the arithmetic mean contains 68.3% of the data. For a log-normally-distributed variable, 68.3% of the results fall within the range of the geometric mean ×/(multiply/divide) by the geometric standard deviation. Accordingly, represents a confidence interval of 68.3% [38]. ◊errors resulting from log-normal fits.