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2. Optické mřížky na motýlích křídlech
- Creator:
- Jiří Křížek
- Format:
- Type:
- article, články, model:article, and TEXT
- Subject:
- Zoologie, hmyz, motýli, babočkovití, 2, and 59
- Language:
- Czech
- Description:
- Microscope images of scales from the wings of the male butterfly Apatura ilia of two forms (ilia and clytie) show parallel fibres with tiny transverse grooves. These can cause (due to the light interference) violet or blue iridescence on the wings, which normally have brown pigmentation. We examined the dependence of the sudden color changes on variable illumination and observation angles. and George O. Krizek a kol.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
3. Otázka výškové stratifikace motýlí fauny tropických lesů
- Creator:
- Jiří Křížek
- Format:
- Type:
- article, články, model:article, and TEXT
- Subject:
- Zoologie, fauna, motýli, tropické lesy, 2, and 59
- Language:
- Czech
- Description:
- Tropical rainforest can be divided into several altitude levels, which vary in light conditions and also in the nature of their flora and fauna. In terms of the occurrence of typical groups of butterflies, we can define these levels by their height range and typical butterfly groups that form mimetic (unilateral and reciprocal) protective complexes there, even though numerous other species also live there which do not belong to these complexes. This issue is described based on the example of lowland tropical forests in South and Central America. and George O. Krizek.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
4. Setkání s veverkovitými hlodavci Severní Ameriky
- Creator:
- Jiří Křížek
- Type:
- article, články, journal articles, model:article, and TEXT
- Subject:
- Zoologie, savci, veverkovití, mammals, squirrels, Severní Amerika, 2, and 59
- Language:
- Czech
- Description:
- Článek přináší ukázku fotografií zástupců čeledi veverkovití (Sciuridae) v Severní Americe. Některé z těchto druhů lze při návštěvách národních parků i jiných míst v Kanadě a Spojených státech amerických pozorovat snadno a někdy i zblízka – představené fotografie vznikly na parkovištích a odpočívadlech, kde se tito hlodavci snaží získat od turistů „pamlsky“., A sample of photographs of representatives of the Sciuridae family in North America is selected. Some of these species can easily be observed on visits to national parks and other locations in Canada and the United States, sometimes from close up – the photos were taken at car parks and lay-bys, where these rodents attempt to obtain “goodies” from the tourists., and George O. Krizek.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public