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Start Over Creator Petrusek, Adam

2. Hlemýžď pruhovaný, nový druh pro evropskou i českou faunu

Creator:
Korábek, Ondřej, Lucie Juřičková, and Petrusek, Adam
Format:
print, bez média, and svazek
Type:
article, články, model:article, and TEXT
Subject:
Biologické vědy, hlemýžďovití, měkkýši, Helicidae, molluscs, Česko, Czechia, hlemýžď pruhovaný, nové druhy, Helix thessalica, new species, 2, and 57/59
Language:
Czech
Description:
Hlemýžď pruhovaný (Helix thessalica) je nejnovějším přírůstkem české a slovenské měkkýší fauny. Pozornosti unikal proto, že nebyl rozlišován od velmi podobného a u nás zcela běžného hlemýždě zahradního (H. pomatia). Jeho odlišení umožnily až molekulárněfylogenetické analýzy, ale nakonec se ukázalo, že ho lze dobře poznat i podle ulity a pohlavního ústrojí. V článku jsou detailně popsány všechny determinační znaky odlišující oba druhy, a nově je podrobně zmapováno rozšíření hlemýždě pruhovaného v České republice. Hlemýžď pruhovaný žije především na jihozápadě Balkánského poloostrova, ale podél Karpat zasahuje od Slovenska až na Moravu. Na té se vyskytuje ostrůvkovitě v údolí řeky Jihlavy mezi Mohelnem a Dolními Kounicemi. Na řadě míst se setkává s hlemýžděm zahradním, se kterým se zřejmě kříží. S ohledem na málo známé rozšíření nově nalezeného druhu vyzýváme k jeho dalšímu hledání u nás i na Slovensku., Helix thessalica is the latest addition to Czech molluscan fauna. It has been overlooked because it wasn’t distinguished from the extremely similar and very common Roman Snail (H. pomatia). Only molecular phylogenetics allowed for its recognition, but eventually it turned out to differ in both its shell and genital system. In this paper, the characters differentiating both species are described and the distribution of H. thessalica in the Czech Republic is newly characterised. It lives mainly in the southwestern Balkans, but along the Carpathian Arc it extends up to Slovakia and Moravia, where it occurs in several patches in the Jihlava river valley. Locally, it apparently hybridizes there with H. pomatia. Readers are encouraged to search for new sites of the species in the Czech and Slovak Republics., and Ondřej Korábek, Lucie Juřičková, Adam Petrusek.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

5. Modelka Daphnia: Perloočky jako modelové organismy v biologii

Creator:
Petrusek, Adam
Type:
article, model:article, and TEXT
Language:
Czech
Description:
Water fleas Daphnia as model organisms in biology. The cladoceran genus Daphnia has been an important study organism in ecology and evolutionary biology for many decades, and recently became officially recognized as a model in biomedical research. It is the first crustacean with fully sequenced genome, and probably best known aquatic invertebrate. The key advantages of daphnids for experimental work is their cyclical parthenogenetic life cycle, easy handling and fast reproduction. In the text, I describe the cyclical parthenogenesis of cladocerans and some interesting deviations of the life cycle found within this genus. Additionally, I discuss various antipredator strategies of Daphnia, in particular phenotypic plasticity of morphological defence structures.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

7. Příběhy z elektronového mikroskopu

Creator:
Petrusek, Adam and Laforsch, Christian
Type:
article and TEXT
Language:
Czech
Description:
Obrana proti predátorům či býložravcům je důležitá pro nejrůznější skupiny organismů. Strategií chránících proti predaci najdeme celou řadu. Mnohé z nich organismus něco „stojí“ – vyžadují energii, která by mohla být investována do růstu anebo rozmnožování. Proto je poměrně časté, že se nejen takové chování, ale i obranné struktury nebo tvorba chemických látek projevují pouze při akutně hrozícím nebezpečí – jde o tzv. fenotypickou plasticitu antipredačních mechanismů. Autoři přibližují objev podobného obranného mechanismu – otrnění hlavy – u druhového komplexu perlooček Daphnia atkinsoni. Perloočky se tak brání proti listonohům rodu Triops. and Protection against predators is important for various groups of organisms. Thus not only specific behaviour, but also defence structures production are displayed, but often only under an acute threat. The phenomenon is called phenotypic plasticity in anti-predatory mechanisms. The authors describe finding a similar induced mechanism, namely the appearance of thorns on the head, in the Daphnia atkinsoni species complex. The water fleas protect themselves against tadpole shrimps, also known as shield shrimps.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/

8. Příběhy ze skenovacího elektronového mikroskopu

Creator:
Juračka, Petr Jan and Petrusek, Adam
Type:
article and TEXT
Language:
Czech
Description:
Zoëy jsou raným larválním stadiem v průběhu vývoje krabů. Od dospělců se značně liší jak morfologicky, tak způsobem života. Rýhy v přední částí krunýře zoëí na obrázku otočené o 180 º připomínají ženské obličeje. and Zoeas are early larval stages during crab ontogenesis. They differ from adults both morphologically and bionomically. In photos, grooves in the front part of the carapace turned around 180 degrees resemble women’s faces.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/

9. When an alien sings at a rival´s post: a passerine excited by conspecific stimulus may show aggressive behaviour towards heterospecific individuals

Creator:
Petrusková, Tereza, Petrusek, Adam, Pavel, Václav, and Fuchs, Roman
Type:
article and TEXT
Subject:
meadow pipit, Anthus pratensis, interspecific territoriality, playback experiments, and misdirected aggressiveness
Language:
English
Description:
We tested the hypothesis that males of meadow pipits (Anthus pratensis) respond differentially to simulated territorial intrusions (song playback + bird model) by conspecific, related (tree pipit, Anthus trivialis), and unrelated individuals (willow warbler, Phylloscopus trochilus), and evaluated the effect of playback order. All tested males responded aggressively to the conspecific playback; reactions to heterospecific stimuli occurred only after previous excitation by the conspecific song and dummy, and were usually weaker. Apparently, although males were able to discriminate between playbacks, excitation by intrusion of a conspecific rival elicited an aggressive reaction to otherwise neutral stimuli. Reactions to heterospecific playbacks closely following the conspecific one did not differ significantly between congeneric and unrelated species. The response to a subsequent heterospecific stimulus, however, was taxon-dependent: congeneric species elicited a significantly stronger reaction than an unrelated one. We presume that this was due to the morphological similarity between pipits, and that the more intensive reaction could have been caused by stronger visual stimulus from the respective model. We discuss the potential benefits as well as limitations of using models (dummies) in playback experiments, and suggest that overexcitation by previous stimuli should be considered during experimental setup and data analysis in studies focusing both on interspecific aggressiveness and on neighbour-stranger interactions.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/