Author(s): Carvalho, C. F., Canard, M. & Alauzet, C.
Title: Influence of the density of Chrysoperla mediterranea (Hölzel, 1972) (Neuroptera: Chrysopidae) adults on its laboratory reproduction potential
Year: 2002
Volume: 48
Pages: 61-65.
Abstract: The reproductive potential of Chrysoperla mediterranea (Hölzel, 1972) was investigated, when adults were subjected to different densities per rearing unit. Couples after emergence were placed into rectangular cages of 450 cm3, fed enzymatic protein hydrolysate of yeast and kept in a climatic chamber at 20±1 °C, RH 70–80% and 16H-photophase. The treatments were repeated six times utilizing 1, 2, 3, 4, 5, 6 and 7 couples with a couple/volume ratio of 1/450, 1/225, 1/150, 1/112, 1/90, 1/75 and 1/64 cm3, respectively. It was observed that the average pre-oviposition period for one couple was 5.8±0.3 days while for the other treatments it was 7–8 days. For the oviposition period no significant differences were found, 100 days being obtained on the average, but for the daily and total oviposition the results showed differences among the treatments with one couple per rearing unit showing the greatest fecundity (520±26.0 eggs/female). By increasing the couple numbers, the total oviposition capacity decreased, becoming more marked from four couples per rearing unit, with only 270.0±103.0 eggs/female when seven couples were utilized (density 1/64 cm3). Longevity was equally affected by density and for a single couple, it was 138.3±11.2 days for the males and 117.8±12.8 days for the females. In comparison, the reduction was in the order of 50% for both sexes when the density was seven couples per chamber.
Keywords: biology, green lacewing, Chrysoperla, rearing units
Journal: Acta Zoologica Academiae Scientiarum Hungaricae
Journal abbreviation:
ISSN: 1217-8837
Publisher: Hungarian Natural History Museum, Budapest
Editor(s): Matskási, I., Peregovits, L. & Sziráki, Gy.
