Table 3 Sample size allocation among trials, colonies and experimental doses.

From: Pesticide risk assessment in free-ranging bees is weather and landscape dependent

 

Control

0.42 ng

0.85 ng

1.19 ng

1.34 ng

2.39 ng

Total number of honeybees

370

186

180

62

118

62

Total number of trials

22

12

12

4

6

4

Trials with >15 honeybees

18

5

7

1

6

3

Number of experimental colonies

9

6

6

2

1

2

  1. A trial refers to a group of either control or treated bees, caught at one of the nine experimental colonies and released at one particular point 1 km away. Releases were further split between two consecutive days to cover a wider range of weather conditions. Average conditions (±s.d.) for released bees were 28.6±4.7 °C ambient temperature, 437.2±132.3 W m−2 solar radiations and 4.2±2.6 km landmark availability. One or two treated trials were carried out at a time, and systematically coupled with a simultaneous control trial from the same colony.
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