Impact of pollen consumption from Cry1Ab- or Cry3Bb1-expressing Bt maize or the corresponding non-transformed varieties on life-table parameters of adult Chrysoperla carnea and results from retrospective power analyses.

Pairs of C. carnea were fed 1 M sucrose solution together with pollen from one of four maize varieties: (a) DKc5143Bt (MON 88017), (b) the corresponding non-transformed control DKc5143, (c) Compa CB (Event Bt176), and (d) the corresponding non-transformed control Dracma. The experiment was terminated after 28 days. No statistical differences (Pvs. (b), (c) vs. (d) and (b) vs. (d) for any of the parameters assessed.Retrospective power analyses were conducted to calculate the detectable difference as percentage difference of detectable treatment means (a, c) relative to control means (b, d) (α = 0.05, power of 80%).aExperiment started with n = 35 per treatment. Pairs producing no or only infertile eggs removed from analyses; bSurvival not analysed since mortality remained below 3% in all treatments. Retrospective power analyses based on log-rank test; cMann-Whitney U-test; dStudent's t-test.