title: [Effect of temperature, relative humidity and photoperiod on embryonic development and egg hatch of Pirata piraticus].
abstract: In this paper, the effects of temperature, relative humidity and photoperiod on embryonic development and egg hatch of Pirata piraticus were investigated. Temperature affected not only the whole course of embryonic development, but also its different phases. At 20 degrees C-35 degrees C, as temperature increased, the embryonic development became faster. The developmental threshold of egg was estimated to be at 11.9 degrees C. The uniform degree of egg hatch was higher at low temperature, while the highest hatching rate was happened at 28 degrees C. In order to study the factors affecting embryonic development and to determine the optimum condition for egg hatch, experiments were arranged by quadratic regression rotation composite design with three factors: temperature (X1), relative humidity (X2) and photoperiod (X3). Three models were built up, and the factors affecting the embryonic development were analyzed. After calculating the hatching rate using the model of hatching rate by computer, the optimum condition for egg hatch of the spider was given: temperature 27 degrees C-28.5 degrees C, relative humidity 94%-97%, and photoperiod 14-17 h.
authors.affiliation: School of Life Science, Hubei University, Wuhan 430062. yfengw@public.wh.hb.cn
authors.forename: Y
authors.initials: Y
authors.lastname: Peng
authors.forename: J
authors.initials: J
authors.lastname: Zhao
authors.forename: C
authors.initials: C
authors.lastname: Hu
mesh_terms: D000818:Animals; D001097:Arachnida / Q000196:embryology / Q000502:physiology* / Q000528:radiation effects; D017753:Ecosystem; D006813:Humidity; D008027:Light; D008954:Models, Biological; D010063:Ovum / Q000502:physiology*; D017440:Photoperiod; D013696:Temperature