The developmental time, survival, and fecundity of Kampimodromus aberrans (Oudemans) (Acari: Phytoseiidae) when feeding on Tetranychus urticae Koch (Acari: Tetranychidae) plus birch pollen were investigated at 16, 20, 25 and 30 +/- 1 degrees C, 65 +/- 10% relative humidity, and 16:8 light: dark photoperiod in the laboratory. Also, the prey-stage preference of adult female K. aberrans was assessed at constant densities of different stages of T. urticae and T. urticae plus birch pollen. Experiments were carried out using bean leaf discs as substrate. Total developmental times of K. aberrans were 37.1, 26.6, 8.0, and 7.4 days for females and 32.1, 24.6, 7.4, and 7.3 days for males at 16, 20, 25, and 30 +/- 1 degrees C, respectively. The total egg production was highest (17.2 eggs) at 25 degrees C, while the daily egg production was at its highest (1.1 eggs) at 30 degrees C. The female longevity of K. aberrans was determined as 75.6, 58.8, 25.8, and 17.4 days at 16, 20, 25, and 30 +/- 1 degrees C, respectively. The development threshold of the eggs and pre-adult stages were 13.75 and 13.55 degrees C for females, and 13.58 and 12.92 degrees C for males, respectively. Total effective temperature was 33.78 and 112.35 degree-days for females and 33.44 and 113.63 for males. The mite had the highest intrinsic rate of increase, (r(m)) 0.129 female/female/day at 30 degrees C, followed by 0.108 female/female/day at 25 degrees C and 0.034 female/female/day at 20 degrees C, while at 16 degrees C, K. aberrans displayed the lowest rm value (0.023 female/female/day). In the prey-stage preference experiments, the adult female K. aberrans consumed significantly more prey larvae of T. urticae alone, but, when the predatory mite was offered T. urticae plus birch pollen, they consumed significantly more eggs.