National Repository of Grey Literature 81 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Mice and Rats: Space, Smell and Methods of Detection
Kaftanová, Barbora ; Frynta, Daniel (advisor) ; Sedláček, František (referee) ; Špinka, Marek (referee)
The coexistence of humans and rodents lasts from the beginnings of the history of agriculture. Many rodent populations accepted to synanthropic way of life and as commensals accompany human societies until today. In the first study we wanted to find out, how the evolution of non-commensal rodent species, a Cypriot mouse (Mus cypriacus), was influenced by people. This endemic island species evolved on the Cyprus Island without presence of any mammalian competitors or predators. In last 10.000 years humans arrived on the island, bringing several mammalian species, which affected the environment markedly. A black rat (Rattus rattus) is now dominant species there and presumably it is an important competitor for the Cypriot mouse. We supposed that the mice should avoid its odour. Nevertheless the rats odour was preferred by the mouse, probably as an odour of phylogenetically related species. On the contraty, the odour of domestic cat (species, which is also widespread on the island), was avoided. In conclusion, the long-term isolation from mammalian predators did not affect the antipredatory reactions of the Cypriot mouse. Our next study was focuse on changes in behavioural strategies of different populations of mice: the main question was how the commensal way of life affects their exploratory...
Social interactions and morphometric analysis of populations of Blue-Tongued Skink (Tiliqua gigas)
Jachnická, Kristýna ; Frynta, Daniel (advisor) ; Rehák, Ivan (referee)
A Blue-tongued skink ( Tiliqua gigas) is a rare exotic species which is very popular between breeders. Nevertheless, the social structure of this charismatic skink remains almost unknown. Because of its high aggressive- ness and difficulties connected with study in its natural habitat, experiments based on the odor discrimination looks like a good alternative for its bet- ter understanding. Our results revealed that the reaction on the odor is generally poor and is very individual. We observed the highest response of interest on odors produced throught dorsal parts of skin. The reaction on conspecific's odor did not lead to escape behavior. Behavioral analysis was complemented by morphological analysis of heads in T. gigas and T.scincoides. These species are divided into separate subspecies, which are formed by geographically distinct populations. We wondered whether it is possible to separate these populations by geometric morphometrics and whether this separation is consistent with phylogenetic studies. We found out that if the populations are united in bigger groups based on their congeniality they seem to be distinct according to the head shape. Our results also revealed the monomorphy in head shape. Unfortu- nately, it is very difficult to distinguish between sexes due to the absence of sexual dimorphism....
UV signs in coloration of common leopard gecko (Eublepharis macularius)
Baranová, Veronika ; Frynta, Daniel (advisor) ; Veselý, Petr (referee)
The presence of ultraviolet patterns on body, as well as perception of ultraviolet spectrum by special photoreceptors, is part of sensory ecology of many animal species, including reptiles. Most current research discusses the importance of ultraviolet signs in coloration of diurnal species. The aim of our study was to find out what character have the reflective signs in ultraviolet spectrum in overall coloration of common leopard gecko (Eubplepharis macularius) through a digital photography. The reflective pattern is present in both adults and juveniles and passes as well as the rest of the coloration by significant ontogenetic changes. Another aim was to evaluate the role of ultraviolet reflecting signs in the biology of this crepuscular-nocturnal species. We expect that the pattern contributes to their antipredatory strategies during their first few months of life, and also a white reflecting surface is preserved in adulthood, especially on their tail, which is differently coloured than the rest of the body.
Morphometric analysis of western palearctic representatives of the genus Apodemus: from determination to ecomorphology
Mikulová, Pavlína ; Frynta, Daniel (advisor) ; Macholán, Miloš (referee) ; Sedláček, František (referee)
Summarv ThePhDthesisisbasedonthefollowingpapers: Tnsr or cHARAcTER DISpLACEMENTrN URBAN populATroNs oF APODEMUSSYLVATICUS MikulováP.& FryntaD.200l CanadianJournalofZoology79:794-801 We studiedthewood mouse,Apodemussylvaticus,inhabitingparks, cemeteries,suburbanwoods and other green areas in the city of Prague. To assess the character displacement and (or) release hypothesiswe compared seven samples from local populations occurringsympatricallywith Apodemusflavicollis with ten samples from thoselocalities in which A.flavicoltis hasneverbeenrecorded. The analysis included 1410 specimens of A. sylvaticrzscollected duringthe years 1980- 1990. Seventeenskull andbody characters weremeasured.Then the datawere ageor size adjusted,and treated by principal component analyses. Factor scores were fuither subjected to statistical testing. Although the results revealed a considerablevariation among localities, they did not suggest character displacement and (or) release. A. sylvaticus from populations sympatric with l. flavicollis were morphometrically similar to their conspeciÍicsfrom otherpopulationscollected at the periphery of the city. However, slight but statistically highly significant differenceswere found betweensamples from localities in the city centreand those from the periphery. This phenomenon may be...

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