Sunday, October 22, 2006 Shopping Cart (2 Items)    Log Out  
 Online Journals
Online Journals Home
About Journals
Search
Browse
 Account
Account Home
Shopping Cart
Order History
Activate Access
Register
 Services
Services Home
Favorites
Alerting
ActiveSearch
 Support
Support Home
Contact Us
Downloads
Exports
  
Article Back To:  Main    Publication    Issue 

  

Israel Journal of Zoology
  Issue:  Volume 49, Number 2-3 / 2003
  Pages:  95 - 109
  URL:  Linking Options

   Special Issue: Aspects of Avian Biology
  Guest Editor(s): Z. Arad and A. Haim
 
PLASTICITY IN AVIAN RESPONSES TO THERMAL CHALLENGES-- AN ESSAY IN HONOR OF JACOB MARDER

WILLIAM R. DAWSON A1

A1 Museum of Zoology, The University of Michigan, Ann Arbor, Michigan 48109-1079, USA

Abstract:

Birds show remarkable plasticity in their thermoregulatory responses, often enhancing heat or cold resistance seasonally or in response to experimentally applied thermal challenges. In regions with severe winters these animals commonly undergo substantial winter fattening, elevate their general metabolic level, and increase thermogenic capacity and endurance. Indications also exist that some species, at least, also increase their capacity for mobilizing energy substrates during cold challenges. Some of these responses also are induced by cold conditioning in the laboratory. The onset of warmer seasons or exposure to higher laboratory temperatures can lead to downregulation of general metabolic level, thereby reducing the thermal load with which birds must contend during the heat of summer days. However, the most spectacular phenotypic adjustment to heat thus far documented is that evident in the heat-acclimated rock pigeon (Columba livia), which achieves a remarkable resistance to high ambient temperatures through expression of a highly efficient system of cutaneous evaporation for cooling. Professor Jacob Marder played a major role in the characterization of this response and in the analysis of its functional basis. It is appropriate to dedicate this essay to his memory in recognition of his important contributions to a fuller characterization of avian thermoregulatory plasticity.


The references of this article are secured to subscribers.


  
 Full Text Access
Full Text Secured

The full text of this article is secured to subscribers. To gain access, you may:

   Subscribe to this publication.

Subscribe

   Add this item to your shopping cart for purchase later.

Add to Shopping Cart

   Purchase this item now.

Purchase Item Now

   Log in to verify access.

Log In



  


For more information feel free to contact us:
E-Mail: laserpages@netmedia.net.il
Fax: 972-2-652-2277 Tel: 972-2-652-2226
Laser Pages
P.O. Box 35409
Jerusalem 91352, Israel
©2006 Laser Pages
All Rights Reserved.

Remote Address: 72.20.99.47 • Server: MPWEB08
HTTP User Agent: Mozilla/5.0 (compatible; heritrix/1.8.0 +http://www.accelobot.com)