Reproduction, growth and circadian activity of the snail Bradybaena fruticum (O. F. Müller, 1774) (Gastropoda: Pulmonata: Bradybaenidae) in the laboratory

摘要: Selected life cycle parameters of the snail Bradybaena fruticum were studied in laboratory. The initial material for laboratory culture was taken from a population South Western Poland; snails kept Petri dishes and plastic containers. temperature, humidity lighting conditions maintained at constant level (day 18 o C, night 12 rh 80%, light:dark 12:12). Circadian activity observations conducted outside climatic chamber. Eggs - calcified, slightly oval, mean dimensions 2.67x2.56 mm laid singly or batches 6-62, as result both biparental uniparental reproduction. Incubation took 27-76 days hatching asynchronous. Hatching success lower among eggs produced by single parents compared to two (c.a. 56 c.a. 88%, respectively). Growth included fast (2.25 5 whorls) slow (1.9-2.25 >5 phases well lip formation, 261 420 days. first eggs/ one year later, uniparentally reproducing period even longer. growth faster than those groups. Juvenile much more active adults spring, summer autumn but mobile winter. In all seasons, juveniles adults.