Life under extreme conditions the larvae of the midwife toad Alytes obstetricans Laurenti, 1768 Amphibia, Discoglossidae in two different reproduction sites in the Spanish Pyrenees Leben unter extremen Bedingungen Larven der Geburtshelferkroete Alytes obstetricans Laurenti, 1768 Amphibia, Discoglossidae in zwei verschiedenen Gewaessern der spanischen Pyrenaen

Scheidt, U.; Uthleb, H.

Veroeffentlichungen des Naturkundemuseums Erfurt 24: 89-100

2005


Accession: 038380571

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Abstract
Growth and development of larvae of the Midwife Toad in a high mountain lake about 2200 m above sea level are compared with tadpoles in a brook about 900 m below the lake. The data of total length, body length, body weight and Gosner's stage of development, show that in both sites are very different strategies of larval development: In the lake with a very short vegetation period the development takes several years, possibly at least 3 years. At low temperatures the development slows down apparently while the growth continues. The largest growth data are 86 mm total length and 5,76 g body weight. At the larvae in the warmer brook the development and the growth take place at the same time. The development is preferred so far that most tadpoles metamorphose probably in the first year. Hibernation seems to be seldom. This should be an adaptation to running waters and especially to high waters in spring.