Volume 32 #2

Contents

1. Tinnitus – contemporary knowledge about its origin, electrophysiological correlates and treatment
2. Eye optics and retinal topography in the nutria (Myocastor coypus)
3. Quantitative study of Poggendorff illusion in school children with normal binocular vision and with strabismus
4. The method of canine odor visualization
5. Precopulatory mechanisms of reproductive isolation between two chromosomal forms of striped hamsters Cricetulus barabensis sensu lato (Rodentia, Cricetinae)
6. Discrimination of sound signals with rippled spectra in on- and low-frequency noise: contribution of compressive nonlinearity and confounding issues
7. The equivalent frequency-tuned filter form for discrimination of spectral pattern of sound signals: Contribution of the lateral suppression and harmonics

Behavioral and hormonal responses of “griseus” males (Chinese hamster) to urine odor of con- and heterospecific (“pseudogriseus” – Transbaikalian hamster) females in different stages of estrous cycle were analyzed. In behavioral tests Chinese hamster males significantly (p<0.05) preferred conspecific diestrous female urine and this result was confirmed by the hormonal response. Testosterone concentration was significantly increased (p<0.05) to diestrous urine exposure of conspecific females only. However, when estrous urine was presented, testosterone concentration was raised significantly (p<0.05) to both chromosomal forms. Interestingly that cortisol level was increased only to heterospecific urine odor and in either phases of physiological cycles of females. Obtained behavioral and hormonal differences complete our recent studies and testify for initial stages of precopulatory isolation mechanisms between explored forms of striped hamsters.

Key words: chemical communication, reproductive isolation, Cricetulus barabensis sensu lato, testosterone, cortisol

DOI: 10.7868/S0235009218020051

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