Please use this identifier to cite or link to this item: https://une.intersearch.com.au/unejspui/handle/1959.11/232
Title: Torpor in free-ranging Tawny Frogmouths (Podargus strigoides)
Contributor(s): Koertner, G (author)orcid ; Brigham, RM (author); Geiser, F (author)orcid 
Publication Date: 2001
Open Access: Yes
DOI: 10.1086/324097
Handle Link: https://hdl.handle.net/1959.11/232
Abstract: Several small caprimulgiform birds (>80 g) are known to entertorpor, apparently to cope with a fluctuating supply of insectprey. Since the large Australian tawny frogmouth (Podargus strigoides; 381–556 g) is also insectivorous, we investigated its thermoregulatory behaviour and thermal biology to determine whether this species is also heterothermic.In an open woodland at ~1,000 m altitude, we equipped eight free-ranging birds with external temperature-sensitive radio transmitters attached to an elastic harness to measure skin temperature (Tskin). Core body temperature (Tb) was measured in three of these birds fitted with an additional intraperitoneal transmitter. Tskin was closely correlated with Tb, although Tskin was usually several degrees below Tb. During the three coldest months of the year (June–August), shallow torpor with Tb as low as 29.1°C occurred frequently,whereas during spring and summer, torpor was not recorded.Torpor occurred either during the night and/or during the firsthalf of the day. Night torpor bouts were initiated after a shortactivity period around dusk and lasted on average for about 7 h. Torpid birds always aroused before sunrise to either commence a second short foraging period or to fly directly to a day roost tree. After birds roosted, Tb fell again around sunrise, and birds occasionally entered a second dawn torpor bout; however, in most cases, Tb increased rapidly not long after entry, most likely due to passive heating by the sun. We conclude that despite their large body size and energetically conservative hunting strategy, tawny frogmouths, like several related caprimulgiform species, frequently enter shallow torpor when low Ta demands high energetic costs for normothermic thermoregulation and likely reduces insect availability.
Publication Type: Journal Article
Source of Publication: Physiological and Biochemical Zoology, 74(6), p. 789-797
Publisher: University of Chicago Press
Place of Publication: Chicago
ISSN: 1522-2152
Field of Research (FOR): 060801 Animal Behaviour
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Statistics to Oct 2018: Visitors: 191
Views: 199
Downloads: 8
Appears in Collections:Journal Article

Files in This Item:
6 files
File Description SizeFormat 
open/SOURCE03.pdfPublisher version (open access)428.36 kBAdobe PDF
Download Adobe
View/Open
Show full item record

SCOPUSTM   
Citations

30
checked on Nov 26, 2018

Page view(s)

44
checked on Dec 29, 2018

Download(s)

14
checked on Dec 29, 2018
Google Media

Google ScholarTM

Check

Altmetric

SCOPUSTM   
Citations

 

Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.