Seasonality of Freeze Tolerance in a Subarctic Population of the Wood Frog, Rana sylvatica
Joint Authors
Costanzo, Jon P.
Rosendale, Andrew J.
Lee, Richard E.
do Amaral, M. Clara F.
Source
International Journal of Zoology
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-13, 13 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-03-24
Country of Publication
Egypt
No. of Pages
13
Main Subjects
Abstract EN
We compared physiological characteristics and responses to experimental freezing and thawing in winter and spring samples of the wood frog, Rana sylvatica, indigenous to Interior Alaska, USA.
Whereas winter frogs can survive freezing at temperatures at least as low as −16°C, the lower limit of tolerance for spring frogs was between −2.5°C and −5°C.
Spring frogs had comparatively low levels of the urea in blood plasma, liver, heart, brain, and skeletal muscle, as well as a smaller hepatic reserve of glycogen, which is converted to glucose after freezing begins.
Consequently, following freezing (−2.5°C, 48 h) tissue concentrations of these cryoprotective osmolytes were 44–88% lower than those measured in winter frogs.
Spring frogs formed much more ice and incurred extensive cryohemolysis and lactate accrual, indicating that they had suffered marked cell damage and hypoxic stress during freezing.
Multiple, interactive stresses, in addition to diminished cryoprotectant levels, contribute to the reduced capacity for freeze tolerance in posthibernal frogs.
American Psychological Association (APA)
Costanzo, Jon P.& do Amaral, M. Clara F.& Rosendale, Andrew J.& Lee, Richard E.. 2014. Seasonality of Freeze Tolerance in a Subarctic Population of the Wood Frog, Rana sylvatica. International Journal of Zoology،Vol. 2014, no. 2014, pp.1-13.
https://search.emarefa.net/detail/BIM-495736
Modern Language Association (MLA)
Costanzo, Jon P.…[et al.]. Seasonality of Freeze Tolerance in a Subarctic Population of the Wood Frog, Rana sylvatica. International Journal of Zoology No. 2014 (2014), pp.1-13.
https://search.emarefa.net/detail/BIM-495736
American Medical Association (AMA)
Costanzo, Jon P.& do Amaral, M. Clara F.& Rosendale, Andrew J.& Lee, Richard E.. Seasonality of Freeze Tolerance in a Subarctic Population of the Wood Frog, Rana sylvatica. International Journal of Zoology. 2014. Vol. 2014, no. 2014, pp.1-13.
https://search.emarefa.net/detail/BIM-495736
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-495736