Maria Ogielska

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Most anuran amphibians produce high numbers of eggs during several consecutive breeding seasons. The question is still open whether oocytes are formed anew as a result of oogonial proliferation after each spawning or the definitive pool of oocytes is established during the juvenile period and is sufficient for the whole reproductive life span of a female.(More)
Pelophylax esculentus is the fertile hybrid of P. ridibundus and P. lessonae. During gametogenesis, one of the parental genomes is removed from the germ line cells, whereas the other one is clonally transmitted to the gametes. In hybrids, development of gonads is delayed in comparison with parental species. This may result from complex processes of genome(More)
Ultrasound imaging has more frequently been used in veterinary medicine of amphibians and reptiles. In this study, we have verified the usefulness of ultrasound imaging in pregnancy determination of the fire salamander Salamandra salamandra. We have also undertaken to estimate the number of larvae and their developmental stage directly in the oviducts.(More)
Background: Hybridogenesis is a very interesting example of reproduction which seems to integrate the sexual and clonal processes in one system. In a case of frogs, described in the paper, two parental species – Rana lessonae and Rana ridibunda can form fertile hybrid individuals – Rana esculenta. Hybrid individuals eliminate one parental haplotype from(More)
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