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Aspects of breeding activity of Rana dalmatina and Rana temporaria reproducing in a seminatural pond

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Author(s): T. Hartel

Journal: North-Western Journal of Zoology
ISSN 1584-9074

Volume: 1;
Start page: 5;
Date: 2005;
Original page

Keywords: Breeding activity | Rana dalmatina | R. temporaria | population trends

ABSTRACT
Although Rana dalmatina and Rana temporaria are widely distributed species throughout Europe, studies regarding the breeding biology of R. dalmatina and the long term fluctuations of the populations of these species, when they are syntopic are scarce. In this study I present data gathered during eight years, regarding the breeding activity and long term trend of two populations that reproduces in a seminatural pond. The prespawning period lasts in average 5.6 days in R. dalmatina and 4 days in R. temporaria. The male (i.e. calling) and female (i.e. spawning) activities are correlated. A significant negative correlation between the average temperature in February and the beginning of the breeding activity in both sexes of both R. dalmatina and R. temporaria populations was observed. The intensiy of the spawning is varying between the years, and is influenced by temperature. Egg masses of both R. dalmatina and R. temporaria were deposited in shallow water, close to the shore. A negative correlation was found between the number of deposited egg masses in the two species.
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