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Contribution to the reproductive biology of Rana ridibunda Pallas (Anura, Ranidae)

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The reproductive biology of the frog Rana ridibunda in the Gallikos river region, northern Greece, during the period 1977-1988 was studied. The reproductive period of R. ridibunda was found to be very long and lasted 113-165 days. The onset, as well as, the duration of the reproductive period depend upon temperature. During the pre-spawning period the formation of the "breeding choruses' takes place. Males call always on the surface of the water from time to time at the beginning of the period, while later, when temperature reaches 17°C, they call continuously, day and night. Oviposition takes place during day or night. The eggs are deposited in several small clumps, usually 5-11, at a distance of 5-10 cm below water-surface and are always attached to dense aquatic vegetation. The first newly-metamorphosed froglets appear in the second half of June, while July and August are the principal months of metamorphosis. The duration of the larval period and the rate of development are both influenced by temperature. Tadpoles in stage XVII were found to have a mean total lenght of 55 mm, while the tadpoles of stage XXIV had a mean total length of' 21.5 mm.

Affiliations: 1: Department of Zoology, University of Thessaloniki, Thessaloniki, Greece


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