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Seasonal effects of dehydration on glucose mobilization in freeze‐tolerant chorus frogs ( Pseudacris triseriata ) and freeze‐intolerant toads ( Bufo woodhousii and B. cognatus ) by Joshua Ronald Edwards; Jennifer Lynn Jenkins; David Leslie Swanson is a Environmental Science article available to read on EtoBox.

What is Seasonal effects of dehydration on glucose mobilization in freeze‐tolerant chorus frogs ( Pseudacris triseriata ) and freeze‐intolerant toads ( Bufo woodhousii and B. cognatus ) about?

## Abstract It has been hypothesized that freeze‐tolerance in anurans evolved from a predisposition for dehydration tolerance. To test this hypothesis, we dehydrated summer/fall‐collected and winter acclimated freeze‐tolerant chorus frogs and dehydration‐tolerant, but freeze‐intolerant, Woodhouse's and Great Plains toads to 25% and 50% body water loss (BWL). Following treatments, we measured glucose, glycogen, and glycogen phosphorylase and glycogen synthetase (summer/fall only) activities in liver and leg muscle. Hepatic glucose levels were not significantly altered by dehydration in either summer/fall‐collected frogs or toads. Conversely, winter acclimated frogs did show an increment (2.9–fold) in hepatic glucose with dehydration, accompanied by a reduction in hepatic glycogen levels. Winter acclimated toads did not mobilize hepatic glucose in response to dehydration. Further, hepatic glycogen and phosphorylase activities did not vary in any consistent manner with dehydration in winter toads. Mean leg muscle glucose values were elevated at 50% BWL relative to other treatments, significantly so compared to 25% BWL for summer/fall‐collected frogs. The pattern of hepatic glucose mob

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Author

Joshua Ronald Edwards; Jennifer Lynn Jenkins; David Leslie Swanson

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0022-104X)

Published

2004

Language

EN

Field

Environmental Science (Life Sciences)