Anhydrobiotic Survival in Populations of the Tardigrades Richtersius coronifer and Ramazzottius oberhaeuseri from Italy and Sweden

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• 作者：K. Ingemar Jö ; nsson ; Simona Borsari ; Lorena Rebecchi
• 关键词：Tardigrada ; anhydrobiosis ; cryptobiosis ; desiccation
• 刊名：Zoologischer Anzeiger - A Journal of Comparative Zoology
• 出版年：2001
• 出版时间：2001
• 年：2001
• 卷：240
• 期：3-4
• 页码：419-423
• 全文大小：113 K

文摘

We report a study on anhydrobiotic survival in the eutardigrades Richtersius coronifer and Ramazzottius oberhaeuseri. In each of these species, we investigated the anhydrobiotic survival of two populations, one from Sweden and one from Italy. We found that anhydrobiotic survival was similar in the Swedish and the Italian populations in both species, indicating no divergence with respect to anhydrobiotic capacity. Body size had a strong effect on the probability to recover from anhydrobiosis, but the effect was in opposite direction in the two tardigrade species. Ramazzottius oberhaeuseri had a considerable higher overall survival (66 % ) than R. coronifer (40 % ). This result is in line with earlier studies that found R. oberhaeuseri to have a very high water-retentive capacity.