D

We released microparticles individually just below the water surface using a fine-tipped pipette and measured the drift distance of microparticles for each current velocity by tracking the distance an individual microparticle that was released just below the water surface moved until it settled on the bottom and stopped moving.

We plotted the number of microparticles per drift net in relation to drift distance from the release point.

We examined differences in drift distances over gravel alone versus gravel and mussel shells combined with a two-way ANOVA.

Drift distances in the flume over gravel and the simulated mussel bed increased with an increase in flow velocity (Fig.

In case of significance, the means were analyzed by Tukey test (P [less than or equal to] 0.05) regarding drift distance comparisons and by Duncan test (P [less than or equal to] 0.05) for the volumetric medium diameter of comparisons and drops density.

The drift distance varied between treatments (Table 1).

So, from the results of this study it can be concluded that the drift distance can reach more than 300 meters from the site of application, with variable concentrations according to the equipment used.