RANA ESCULENTA — KOMPLEX IN DER SCHWEIZ 



1247 



Switzerland, various crossings have been made. The larvae were brought up and 

 the freshly metamorphosed individuals analysed. Homotype crossings lessonae x 

 lessonae and ridibunda X ridibunda have an ofTspring of the same type as their 

 parents, whereas larvae of esculenta x esculenta provenience ail die between 

 5th and 9th larval week. Esculenta phenotypes on the other hand always had their 

 origine in the crossing esculenta x lessonae. Ail thèse results correspond very 

 well with the facts Berger found in Poland. 



LITERATUR 



Aebli, H. 1966. Rassenunterschiede in bezug auf Entwicklungsgeschwindigkeit und 

 Geschleehtsdifferenzierung bei Rana temporaria in den Tàlern des Kantons 

 Glarus (Schweiz). Revue suisse Zool. 73: 1 — 35. 



Berger, L. 1964. Is Rana esculenta lessonae Camerano a distinct species? Ann. Zool. 

 Warszawa 22: 45 — 61. 



— 1966. Biometrical studies on the population of green frogs from the environs 



of Poznan. Ann. Zool. Warszawa 23 : 303 — 324. 



— 1968. Morphology of the F x génération of various crosses within Rana esculenta 



complex. Acta Zool. Cracov 13: 301 — 324. 



— 1970. Some characteristics of the crosses within Rana esculenta complex in post- 



larval development. Ann. Zool. Warszawa 27: 373 — 416. 

 Gùnther, R. 1970. Der Karyotyp von Rana ridibunda Pall. und das Vorkommen von 

 Triploidie bei Rana esculenta L. (Anura, Amphibia). Biol. Z'bl. 89: 

 327-342. 



Hodler, F. 1958. Untersuchungen iiber den Crowd-Effekt an Kaulquappen von Rana 



temporaria L. Revue suisse Zool. 65: 350 — 359. 

 Karaman, S. 1948. Prilog herpetologiji sjeverne Srbije. Prirodosl. Istraz. 24: 31 — 74. 

 Kauri, H. 1959. Die Rassenbildung bei europàischen Rana-Arten und die Gultigkeit der 



Klimaregeln. Ann. Soc. Tart. Res. Nat. Invest. Const. Lund 2: 1 — 171. 

 Mertens, R. und H. Wermuth, 1960. Die Amphibien und Reptilien Europas. Frank- 



furt à.M. 264 p. 



