In the present study, we determine the presence of parasites in fish larvae collected from nearshore waters along the northern and central coast of Chile. The parasites were identified to the lowest possible taxonomic level based on morphological and molecular analyses. The fish sample was composed of 5 574 fish larvae. Of these, 3% harboured only larval ectoparasitic copepods whereas no endoparasites were found in the 1 141 fish evaluated for this group of parasites. The parasitic copepods collected were initially classified as 'morphotypes' according to differences in morphological characteristics. They were then analysed using molecular techniques based on the 28S and COI genes. Seven morphotypes of parasitic copepods (mostly at chalimus stages) were recognised: two of the morphotypes belonged to Pennellidae Burmeister, 1835, three to Caligidae Burmeister, 1835 and two were not identified. Only five morphotypes of copepods were analysed using molecular sequences, which confirmed the existence of six species: two pennellids of the genus Trifur Wilson, 1917 and two caligids of the genus Caligus Müller, 1785, plus two additional species that were morphologically different from these taxa. The pennellids were present in several fish species, being generally more prevalent than the caligids, in both the central and northern localities of Chile. Multispecies infections in larval fish were infrequent (< 1%). We conclude that fish larvae were rich in parasites, considering that these hosts exhibited small body sizes and were very young. We suggest that fish larvae could play a role, as intermediate hosts, in the life cycle of the parasitic copepods found., Gabriela Muñoz, Mauricio F. Landaeta, Pamela Palacios-Fuentes, Zambra López, María Teresa González., and Obsahuje bibliografii
Abiotic and biotic factors determine success or failure of individual organisms, populations and species. The early life stages are often the most vulnerable to heavy mortality due to environmental conditions. The deer ked (Lipoptena cervi Linnaeus, 1758) is an invasive insect ectoparasite of cervids that spends an important period of the life cycle outside host as immobile pupa. During winter, dark-coloured pupae drop off the host onto the snow, where they are exposed to environmental temperature variation and predation as long as the new snowfall provides shelter against these mortality factors. The other possible option is to passively sink into the snow, which is aided by morphology of pupae. Here, we experimentally studied passive snow sinking capacity of pupae of L. cervi. We show that pupae have a notable passive snow sinking capacity, which is the most likely explained by pupal morphology enabling solar energy absorption and pupal weight. The present results can be used when planning future studies and when evaluating possible predation risk and overall survival of this invasive ectoparasite species in changing environmental conditions., Sirpa Kaunisto, Hannu Ylönen, Raine Kortet., and Obsahuje bibliografii
Pavel Dvořák, Jan Hanousek., České resumé, Projekt je financován Evropským sociálním fondem, rozpočtem hl. města Prahy a státním rozpočtem, and born digital
Studie zaměřená na určení původu mramoru použitého ve 2. pol. 13. stol. na dekorační prvky architektury nově založeného žďárského cisteriáckého kláštera., Jan Válek, Karel Malý, Radim Gonda, Jaroslav Řihošek, Olga Skružná, Miroslav Kovář., Obsahuje bibliografie a bibliografické odkazy, and České, anglické a německé resumé
This article presents a method for computer-assisted text analysis, which has been employed by the author in a number of studies. The inductive methodology is based on a frequency count analysis of the co-occurrence of words; and a visualization of the results of this text analysis in a two dimensional space. The main advantage of this text analysis technique is its potential for (a) exploring large amounts of textual data without any pre-coded or theoretically laden vocabularies or thesauri; and (b) the extraction of discursive patterns often only detectable in an a posteriori expert analysis. An example is used to demonstrate the use of this computer assisted text analysis method through an analysis of the transcripts of biographical interviews exploring life in Czech socialist society. The analysis presented uncovers both shared and distinctive discursive patterns found in the narratives of the interviewees who come from two distinct social groups.
autoři katalogu : Jana Koudelová, David Stejskal, Jan Tippner, Michal Kloiber, Jiří Bláha, Petr Růžička, Tomáš Kolář, Michal Rybníček, Jaroslav Buzek, Tomáš Dostál, Jaromír Milch, Jan Baar, Dominik Hess, Jan Zlámal, Hanuš Vavrčík, Radek Bryol ; editor: Jana Koudelová ; fotografie: Jaroslav Hrivnák, Michal Kloiber, Jan Kolář, Tomáš Kolář, David Stejskal, Willy Tegel., Seznam zkratek, Obsahuje bibliografii, and Anglické resumé