The article examines the Czech educational praxis toward integration of immigrant children. Although the number of immigrant children increased during past several years, Czech national educational policy still lacks specific measures which would systematically promote inclusive education and integration of immigrant children. The article aims to describe the experience of schools with integration of immigrant children at schools, and to identify the most important barriers that prevent full participation of immigrant children according to accounts of interviewees. Based on 21 in-depth interviews with representatives of school staff in 11 Prague public-sector základní škola (ISCED 1+2) with higher share of immigrant children (5-20 %), the paper provides insight into diverse into the ways how schools deal with immigrant children, families´ acculturation strategies and inclusive educational policy. The article concludes with a discussion of “immigrant paradox”, highly achieving minorities (particularly Vietnamese students)., Kateřina Vojtíšková., and Obsahuje seznam literatury
Herbivorous insects are often highly specialised, likely due to trade-offs in fitness on alternative host species. However, some pest insects are extremely adaptable and readily adopt novel hosts, sometimes causing rapid expansion of their host range as they spread from their original host and geographic origin. The genetic basis of this phenomenon is poorly understood, limiting our ability to predict or mitigate global insect pest outbreaks. We investigated the trajectory of early adaptation to novel hosts in a regionally-specialised global crop pest species (the cowpea seed beetle Callosobruchus maculatus). After experimentally-enforced dietary specialisation for nearly 300 generations, we measured changes in fitness over the first 5 generations of adaptation to 6 novel hosts. Of these, C. maculatus reproduced successfully on all but one, with reduced fitness observed on three hosts in the first generation. Loss of fitness was followed by very rapid, decelerating increases in fitness over the first 1-5 generations, resulting in comparable levels of population fitness to that observed on the original host after 5 generations. Heritability of fitness on novel hosts was high. Adaptation occurred primarily via changes in behavioural and phenological traits, and never via changes in offspring survival to adulthood, despite high heritability for this trait. These results suggest that C. maculatus possesses ample additive genetic variation for very rapid host shifts, despite a prolonged period of enforced specialization, and also suggest that some previously-inferred environmental maternal effects on host use may in part actually represent (rapidly) evolved changes. We highlight the need to examine in more detail the genetic architecture facilitating retention of high additive genetic variation for host shifts in extremely adaptable global crop pests., Thomas N. Price, Aoife Leonard, Lesley T. Lancaster., and Obsahuje bibliografii
Many insects masquerade as parts of plants, such as bark or leaves, or mimic poisonous organisms in order to defend themselves against predators. However, recent studies indicate that plants may mimic insects and other arthropods to deter herbivores. Here, I report visually similar white structures of plants and arthropods in Japan and suggest they are part of a mimicry complex. Young shoots covered with white trichomes or waxy substances may mimic wax-producing insects, such as woolly aphids, coccids and caterpillars, potentially resulting in reduced herbivory. Since wax-producing insects would reduce plant quality and quantity, be distasteful and attract natural enemies, herbivorous insects and mammals may avoid such white shoots. Furthermore, fungus-infected insects, gregarious braconid cocoons, spider egg sacs and froth made by froghopper nymphs or blasticotomid sawfly larvae are also conspicuously white and impose risks for herbivorous insects. Thus, these white structures may be mimicry models for white shoots and are likely to be part of a defensive mimicry complex. Although this study focuses on defence against herbivores, there are simultaneous physiological roles for white colouration that will not be discussed in depth here., Kazuo Yamazaki., and Obsahuje bibliografii
The Czech Academy of Sciences (CAS) celebrates its 125-year anniversary with a new strategy for its future development (consisting of 14 research programmes) and also with its new logo. Part of the speech of the CAS President delivered at the 45th Session of the Academiy Assembly (16th December 2014) is published with the aim of presenting the important ideas behind the Strategy AV21 for the 21st century. and Jiří Drahoš.