Hibernation and Torpor in Mammals and Birds

Hibernation and Torpor in Mammals and Birds explores the physiological factors that control hibernation and torpor in birds and mammals. This text covers topics ranging from metabolism in hibernation to the role of endocrines, respiration and acid-base state in hibernation, and theories of hibernation.
This book is comprised of 14 chapters and begins with an overview of some clear-cut definitions and why mammals and birds hibernate. The reader is then introduced to the variations from euthermia that have been observed among birds and mammals. To give some structure to this listing, the approach is phylogenetic, starting with the birds and proceeding through the primitive to the more advanced mammals. Subsequent chapters explains the process of entering hibernation and the hibernating state, itself; capability of a species in natural hibernation to arouse from that state using self-generated heat; physiological changes at the start of a spontaneous arousal; and physiological mechanisms underlying the ability of hibernators to rewarm. Consideration is also given to intermediary metabolism in hibernation, cold adaptation of metabolism in hibernators, and the response of hibernators to various extrinsic influences such as neoplastic growth, radiation injury, and parasitism and symbionts.
This book will be of interest to students and researchers in fields ranging from zoology to physiology and biophysics.

Contenu

Preface

1. Why Bother to Hibernate?
   References
2. Who is Who among the Hibernators
   Birds
   Mammals
   References
3. Entering Hibernation
   References
4. The Hibernating State
   References
5. Sensitivity to Arousal
   References
6. The Mystery of the Periodic Arousal
   The Emergency Emergence
   The Deep-but Not Unbroken-Sleep
   References
7. Mechanisms of Arousal
   References
8. Intermediary Metabolism in Hibernation
   Temporal Changes in Intermediary Metabolism
   Temporal Relations of Metabolism within the Short Cycle of Hibernation
   References
9. Is There Cold Adaptation of Metabolism in Hibernators?
   Management of ATP at Low Temperature in Mammalian Tissues
   Effect of Temperature on Metabolic Rate
   References
10. Hibernation: Some Intrinsic Factors
    References
11. Hibernation: Responses to External Challenges
    References
12. Hibernation and the Endocrines
    Introduction
    Hypothalamo-Hypophyseal Interactions in Hibernation
    Role of Brain Monoamines on Control of Endocrine Functions and Thermoregulation
    Pituitary Gland
    Thyroid
    Parafollicular (C) Cells of Thyroid and Parathyroids
    Endocrine Pancreas
    Pineal
    Gonads
    Adrenal Gland
    Perspectives
    References
13. Respiration and Acid-Base State in Hibernation
    Studies on Deep Hibernation
    Transient States: Entrance and Arousal
    Environmental Respiratory Conditions and Hibernation
    Discussion: Respiration and the Physiology of Hibernation
    References
14. Recent Theories of Hibernation
    References
    Index