Recuperation of brood production in <i>Bombus terrestris</i> colonies during a pulsed exposure to imidacloprid.

2013-11-04T03:44:07Z (GMT) by Ian Laycock James E. Cresswell
<p>Recuperation of brood production in standardised <i>Bombus terrestris</i> colonies (<i>N</i> = 60) during the 14-day ‘off dose’ period of pulsed exposure, wherein bees fed exclusively on undosed control syrup. The ‘off dose’ period followed a 14-day ‘on dose’ period during which bees' fed on syrup dosed with imidacloprid at the given concentrations (in µg kg<sup>−1</sup>  =  parts per billion). Recuperation (<i>ΔBrood</i>) is determined by analyzing the difference in brood production between the ‘on dose’ (days 1–14) and ‘off dose’ (15–28) periods, specifically: <i>ΔBrood</i>  =  <i>Brood<sub>off</sub></i> − <i>Brood<sub>on</sub></i>, with a positive value indicating increased production of brood when ‘off dose’. Data represent the means and error bars indicate ± SE. The solid line indicates the following logarithmic trend: <i>ΔBrood</i> = 1.428 × ln(<i>dosage</i>) + 6.533, <i>R<sup>2</sup></i> = 0.38. Dashed line indicates <i>ΔBrood</i> = 0.</p>