Autor popisuje různé projevy chování motýlice obecné (Calopteryx virgo), hlavně pak teritoriální chování, námluvy, páření i kladení snůšky. and The author describes Beautiful Demoiselle (Calopteryx virgo) behaviour, particularly territorial behaviour, courtship, mating and egg-laying.
The order grebes (Podicipediformes) is an archaic group of birds, morphologically and ecologically well adapted to the aquatic life style, including breeding in floating nests in the littoral zone of water bodies. Four grebe species are breeding in fishponds in the Czech republic. Annually during the breeding season, these birds have to overcome many problems to successfully breed. In the incubation period, the most important mission for parents is to protect the eggs from predation. and Jan Sychra.
Successful rearing of a grebe (Podicipediformes) brood depends on several environ - mental factors, such as climatic conditions and food supply at the breeding site. In connection with their insufficient thermoregulation in the first days of their life grebe chicks are brooded, warmed and fed, under the wings on the back of their pa - rents. Although grebes are very adaptable birds, fishpond degradation is currently inducing a decrease of these waterbirds. and Jan Sychra.
Základní životní projevy mnoha druhů pavouků jsou stále zahaleny tajemstvím. Donedávna byl jedním z nich i slíďák lesostepní (Arctosa lutetiana, syn. Tricca lutetiana), který badatele překvapil nečekanými vlastnostmi - způsobem lovu počínaje, přes délku svého života a způsobem rozmnožování konče. Slíďák lesostepní je rozšířený prakticky po celé Evropě. Vyskytuje se od jižní Skandinávie po severní Řecko a od Francie po Ural; nenajdeme ho pouze na území Středozemí - nedávno publikovaný nález z Turecka (Bayram a kol. 2007) se zakládal na chybné determinaci, šlo o podobného slíďáka tbiliského (Arctosa tbilisiensis). Přestože tento pavouk žije v Evropě, na území s nejdéle trvajícím arachnologickým výzkumem, dosud se o jeho biologii nevědělo prakticky nic., Arctosa (syn. Tricca) lutetiana is a burrowing nocturnal extra-Mediterranean species of spiders (record from Turkey is a misidentification of A. tbilisiensis). As it preys passively inside its burrow, it has a prolonged life cycle. The mating period is in June. During copulation, males perform unique leg movements. Females spin only one egg sac (ca. 25 eggs) per season, the second egg sac is produced the following year., and Petr Dolejš.
This article is meant, first, as a brief introduction to South African music studies and some of its specific problems for the Czech (ethno)musicological community, second, as a summary of some recent developments in the field, and third, perhaps most importantly, as a starting point for my research in the South African popular music culture. As a red thread, one basic idea goes through the whole text: the problem of essentialism and binary oppositions, how (if it is possible) to go beyond and what methods we can choose to reach this goal. Drawing on particular examples, I plead for a broadly based cultural analysis, new comparative approach and ethnographically informed local-scale studies. My findings and suggestions are based on my immediate experience with the South African environment – lasting more than fourteen months between 2005 and 2008 – as both a student and field researcher in popular music culture in South Africa and Lesotho.