• Libraries
    • Log in to:
    View Item 
    •   MSpace Home
    • Faculty of Graduate Studies (Electronic Theses and Practica)
    • FGS - Electronic Theses and Practica
    • View Item
    •   MSpace Home
    • Faculty of Graduate Studies (Electronic Theses and Practica)
    • FGS - Electronic Theses and Practica
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Metabolic costs and honest signalling of need during the development of endothermy in American white pelicans

    Thumbnail
    View/Open
    MQ41672.pdf (5.651Mb)
    Date
    1999-07-01
    Author
    Abraham, Christine
    Metadata
    Show full item record
    Abstract
    I examined the development of endothermy in American white pelican chicks (Pelecanus erythrorhynchos) during the first 16 days after hatching. My results suggest that, while pelican chicks reached a modest degree of incipient endothermy by day 7, thermoregulatory self-sufficiency was not well developed until day 16. The age of endothermy in pelicans was similar to those reported for other large pelecaniform species studied to date. Honest signalling models predict that if offspring solicitation is a true reflection of need, then solicitation should be costly and costs should increase with need. I measured the metabolic costs of vocal heat solicitation calls given by pelican chic s in response to anticipated thermal need on days 1, 4, 7, 10 and 13. Call rates, metabolic rates (Vo$\sb2$) and body temperatures were measured during exposure to both warm (mid-thermoneutral) and cold (5$\sp\circ$C below thermoneutral) ambient temperatures. I also measured the call rates, Vo$\sb2$ and body temperatures of pelican chicks (days 1, 4, 7, 10 and 13) exposed to warm (mid-thermoneutral) and cold (5$\sp\circ$C below thermoneutral) ambient temperatures, and those given the opportunity to vocally thermoregulate. (Abstract shortened by UMI.)
    URI
    http://hdl.handle.net/1993/2030
    Collections
    • FGS - Electronic Theses and Practica [25494]

    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV
     

     

    Browse

    All of MSpaceCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    Login

    Statistics

    View Usage Statistics

    DSpace software copyright © 2002-2016  DuraSpace
    Contact Us | Send Feedback
    Theme by 
    Atmire NV