Thelytokous parthenogenesis is a type of sex determination in which females are produced from unfertilized eggs. Genetic and endosymbiont-induced forms of thelytoky have been described in the Hymenoptera. Our study has revealed that Wolbachia, Cardinium, Spiroplasma and other endosymbionts are probably absent in Iberian populations of harvester ants, Messor barbarus and Messor capitatus (Hymenoptera: Formicidae: Myrmicinae) and are thus not involved as factors in the sex determination of these two species. Our results lend weight to previous suggestions that bacterial parthenogenesis induction in Hymenoptera is probably limited to the reproductive systems of chalcidoid and cynipoid parasitoid wasps (Hymenoptera: Apocrita: Chalcidoidea and Cynipoidea, respectively)., Paloma Martínez-Rodríguez ... [et al.]., and Obsahuje seznam literatury
Entomopathogenic nematodes from families Steinernematidae and Heterorhabdi - tidae and the molluscoparasitic nematode Phasmarhabditis hermaphrodita are enigmatic soil creatures. These lethal pathogens of invertebrates can also be used as effective and safe biocontrol agents. In this article, we review the biology, ecology and distribution of these organisms and we de - pict their current use in biological control. and Jiří Nermuť, Vladimír Půža, Zdeněk Mráček.
Ernst Schäfer (1910-1992) byl německý zoolog, sběratel přírodnin a cestovatel známý zejména díky třem průkopnickým výpravám do Tibetu, území, kam se přírodovědci prakticky nedostali až do druhé poloviny 20. století. Třetí expedice z let 1938-39 je poněkud kontroverzní, neboť se stala součástí nacistické propagandy a její cíle nebyly čistě jen vědecké., Ernst Schäfer (1910–92) was a German zoologist, collector and explorer who is primarily known for his three pioneering expeditions to Tibet, which was virtually closed to science well into the second half of the 20th century. The third expedition, in 1938–39, was rather controversial as it became a part of Nazi propaganda and its goals were not purely scientific., and Jan Robovský, Jiří Hrubý.
The pistachio psylla, Agonoscena pistaciae Burckhardt & Lauterer (Hemiptera: Psyllidae), is a major pest of pistachio trees throughout the pistachio producing regions in Iran. The effect of temperature on the developmental rates of eggs and nymphs of A. pistaciae was determined at different constant temperatures, i.e. 15, 20, 25, 30, 32.5 and 35 ± 0.5°C. The relationships between temperature and developmental rates were described by linear and the non-linear Lactin models. These models were evaluated based on R2, RSS, AIC and R2adj. The estimated value of the lower temperature threshold for egg, nymph and egg to adult development based on the linear model was 8.06, 10.38 and 9.97°C, respectively, and based on the Lactin model was 8, 11.55 and 11.2°C, respectively. Thermal constants estimated using the linear model, were 88.5, 243.90 and 333.33 DD, respectively, for egg, nymph and egg to adult development. These results indicate that the linear model gives a better description of the relationship between developmental rate and temperature for A. pistaciae than the non-linear model. These results could be incorporated into forecasting models used in the integrated pest management of this pest. and Mohammad Reza Hassani, Abbas Arbab, Hamzeh Izadi, Gadir Nouri-Ganbalani.