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Comparison of the cold hardiness capacities of the oviparous and viviparous forms ofLacerta vivipara

✍ Scribed by Voituron, Yann ;Heulin, Benoit ;Surget-Groba, Yann

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
99 KB
Volume
301A
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

The lizard Lacerta vivipara has allopatric oviparous and viviparous populations. The cold hardiness strategy of L. vivipara has previously been studied in viviparous populations, but never in oviparous ones. The present study reveals that both the oviparous and viviparous individuals of this species are able to survive in a supercooled state at −3°C for at least one week when kept on dry substrates. The mean crystallisation temperatures of the body, around −4°C on dry substrata and −2°C on wet substrata, do not differ between oviparous and viviparous individuals. All the individuals are able to tolerate up to 48–50% of their body fluid converted into ice, but only viviparous individuals were able to stabilize their body ice content at 48%, and hence were able to survive even when frozen at −3°C for times of up 24 hours. Ice contents higher than 51% have been constantly found lethal for oviparous individuals. This suggests that, in L. vivipara, the evolution towards a higher degree of freezing tolerance could parallel the evolution of the viviparous reproductive mode, a feature believed to be strongly selected under cold climatic conditions. This is the first report, among reptiles, of an intraspecific variation regarding the freeze tolerance capacities. J. Exp. Zool. 301A:367–373, 2004. © 2004 Wiley‐Liss, Inc.

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