Are the hibernating water frogs from Pelophylax (Rana) esculentus complex (from North-Western Romania) able to adapt to the thermal water conditions?
Journal Title: Advances in Environmental Sciences - International Journal of the Bioflux Society - Year 2009, Vol 1, Issue 1
Abstract
We were interested to determine if the hibernanting Pelophylax ridibundus and the other two forms of water frogs from the Pelophylax esculentus complex (Pelophylax lessonae, Pelophylax esculentus) fulfil the requirements of thermal resistance in order to become adapted to the thermal habitats. During the experiment we had determined for each frog the value of two parameters: VTMax and CTMax. The experimental determination of the resistance to temperature of the water frogs from the P. esculentus complex has revealed a great resistance of these frogs to high temperatures. Although the difference among the analysed frogs is not significant concerning the values of the voluntary and critical thermal maximum, it still can be observed a specific hierarchical order. This resistance (an average of 34.52ºC), observed in the case of the hibernating populations of P. ridibudnus indicates the reason why the marsh frogs can adapt so easily to the conditions from thermal waters. The voluntary thermal maximum obtained for the hybrid Pelophylax kl. esculentus does not differ noticeably, having an average value of 33.31ºC. The lowest values for this parameter were recorded for the Pelophylax lessonae species (an average of 33.02ºC).
Authors and Affiliations
Éva-Hajnalka Kovács, Severus-Daniel Covaciu-Marcov
Keywords
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