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Effects of food and thermal regimes on body condition indices and skin colouration in corn snakes

  • Radovan Václav EMAIL logo and Zuzana Kolníková
Published/Copyright: February 18, 2017
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Biologia
From the journal Biologia Volume 72 Issue 1

Abstract

One of the open problems in evolutionary ecology is signal reliability. While the view that signals need to be costly to be honest has attracted most attention, this type of signals may apply only to some contexts. Also, different views exist about the nature of costs involved in signal honesty, and the classification and examination of these costs remains controversial. Pigmentarybased colouration of animal integuments has received considerable attention among researchers seeking to explain what maintains the honesty of visual signals, but support for existing hypotheses is far from conclusive. Here we use a whole-animal approach and consider a distinct time scale, the period of juvenile growth, to test the effects of different feeding and thermal regimes on different physical parameters and skin colouration in corn snakes Pantherophis guttatus. Postnatal body length growth rate and body mass index (BMI) were sensitive to the thermal, but not to the food regime. The length of intervals between skin shedding was shorter and the short-wavelength reflectance of dorsal skin was higher for snakes receiving food more frequently and having an uninterrupted possibility to thermoregulate. This work suggests that if juvenile corn snakes are environmentally constrained, their preferred life history strategy is to grow at faster rates. The study adds to the growing body of evidence in that BMI may not accurately reflect individual condition in reptiles. Instead, this study demonstrates that the length of shedding intervals and the short-wavelength component of skin colouration may be used in this animal system as proxies of the individual’s condition or quality, possibly reflecting exposure to environmental stress or an ability to cope with it.

Key words: corn snakes; body condition; colouration

Acknowledgements

This contribution is the result of the project implementation of the Center of excellence for protection and use of landscape and biodiversity (ITMS 26240120014) supported by the Research & Development Operational Programme funded by the ERDF. We are grateful to three anonymous reviewers for their constructive comments and suggestions. Z. Kolníková would like to thank her parents for their support in making the long-term experiment possible in their household.

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Received: 2016-10-2
Accepted: 2017-1-4
Published Online: 2017-2-18
Published in Print: 2017-1-1

©2017 Institute of Zoology, Slovak Academy of Sciences

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https://doi.org/10.1515/biolog-2017-0008
Keywords for this article
corn snakes; body condition; colouration

Articles in the same Issue

  1. Cellular and Molecular Biology
  2. Potential Ebola drug targets – filling the gap: a critical step forward towards the design and discovery of potential drugs
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  5. Botany
  6. The current state of steppe perennial plants populations: A case study on Iris pumila
  7. Botany
  8. Expression, activity of phenylalanine-ammonia-lyase and accumulation of phenolic compounds in Lotus japonicus under salt stress
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  14. The rediscovery of Orthoceratium lacustre (Scopoli, 1763) (Diptera: Dolichopodidae) in Belgium, with data on its ecology and distribution in the Palaearctic region
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  16. New records of long-legged flies (Diptera: Dolichopodidae) from Armenia, with description of Campsicnemus armeniacus sp. n.
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