Saturday, April 2, 2011

Snow Frog Mating (Katak Salju Kawin)

Rana temporaria_snow frog_katak salju 1The European common frog (Rana temporaria) has adapted to a wide variety of conditions, increasing its range over most of Europe.

Rana temporaria_snow frog_katak salju 2Emerging from a partially frozen pond more than 6,000 feet high in the Alps, European common frogs (Rana temporaria) set out to find mates and begin breeding activities.

Rana temporaria_snow frog_katak salju 3The search for mates often begins underwater, before surface ice has melted. Photographer Cyril Ruoso could hear the calls of male snow frogs in spring even through the ice of Alpine ponds.

snow frog mating_katak salju kawinSnow frogs mate (katak salju kawin) in a position called amplexus, with the smaller male frog clasping the female from behind in a ride that can last two days or more. As she lays eggs, he expels sperm to fertilize them.

snow frog mating_katak salju kawin 2Snow Frog pairs can begin hibernation in amplexus, turning it into a months-long embrace that may provide a breeding advantage by allowing mating as quickly as possible once warm weather arrives.

snow frog eggEggs of high-elevation frogs may be 30 percent larger than those of lowland females, giving tadpoles a head start.


Classification of European common frog (Rana temporaria)
Kingdom Animalia C. Linnaeus, 1758 – animals
Phylum Chordata Bateson, 1885 - chordates
Class Amphibia Gray, 1825 - amphibians
Order Anura (Fischer von Waldheim, 1813) Gray, 1825
Superfamily Ranoidea Rafinesque, 1814
Family Ranidae Rafinesque, 1814 - frogs
Genus Rana C. Linnaeus, 1758 - frog
Species Rana temporaria C. Linnaeus, 1758 – european common frog
Common names:
English: Common Frog, European Common Frog, European Common Brown Frog, European Frog, Grass Frog
Croatian: livadna smeđa žaba
Czech: skokan hnědý
Danish: Butsnudet Frø
German: Grasfrosch
Polish: Żaba trawna
Rumanian: broasca roşie de munte
Slovak: skokan hnedý
Spanish: rana común

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