Interplay among nocturnal activity, melatonin, corticosterone and performance in the invasive cane toad (Rhinella marinus) Jessop, Tim S., Dempster, Tim, Letnic, Mike and Webb, Jonathan K. 2014, Interplay among nocturnal activity, melatonin, corticosterone and performance in the invasive cane toad (Rhinella marinus), General and comparative endocrinology, vol. 206, pp. 43-50, doi: 10.1016/j.ygcen.2014.07.013. Attached Files Name Description MIMEType Size Downloads Title Interplay among nocturnal activity, melatonin, corticosterone and performance in the invasive cane toad (Rhinella marinus) Author(s) Jessop, Tim S. orcid.org/0000-0002-7712-4373 Dempster, Tim Letnic, Mike Webb, Jonathan K. Journal name General and comparative endocrinology Volume number 206 Start page 43 End page 50 Total pages 8 Publisher Elsevier Place of publication Amsterdam, The Netherlands Publication date 2014-09-15 ISSN 1095-6840 Keyword(s) Behavioral flexibility Ecology Environmental variation Hormonal plasticity Organismal performance Sleep–wake cycles Summary Most animals conduct daily activities exclusively either during the day or at night. Here, hormones such as melatonin and corticosterone, greatly influence the synchronization or regulation of physiological and behavioral cycles needed for daily activity. How then do species that exhibit more flexible daily activity patterns, responses to ecological, environmental or life-history processes, regulate daily hormone profiles important to daily performance? This study examined the consequences of (1) nocturnal activity on diel profiles of melatonin and corticosterone and (2) the effects of experimentally increased acute melatonin levels on physiological and metabolic performance in the cane toad (Rhinella marinus). Unlike inactive captive toads that had a distinct nocturnal melatonin profile, nocturnally active toads sampled under field and captive conditions, exhibited decreased nocturnal melatonin profiles with no evidence for any phase shift. Nocturnal corticosterone levels were significantly higher in field active toads than captive toads. In toads with experimentally increased melatonin levels, plasma lactate and glucose responses following recovery post exercise were significantly different from control toads. However, exogenously increased melatonin did not affect resting metabolism in toads. These results suggest that toads could adjust daily hormone profiles to match nocturnal activity requirements, thereby avoiding performance costs induced by high nocturnal melatonin levels. The ability of toads to exhibit plasticity in daily hormone cycles, could have broad implications for how they and other animals utilize behavioral flexibility to optimize daily activities in response to natural and increasingly human mediated environmental variation. Language eng DOI 10.1016/j.ygcen.2014.07.013 Field of Research 060603 Animal Physiology - Systems 060801 Animal Behaviour 0608 Zoology 0606 Physiology 0707 Veterinary Sciences Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences HERDC Research category C1.1 Refereed article in a scholarly journal ERA Research output type C Journal article Copyright notice ©2014, Elsevier Persistent URL http://hdl.handle.net/10536/DRO/DU:30081786 Document type: Journal Article Collections: Faculty of Science, Engineering and Built Environment School of Life and Environmental Sciences Centre for Integrative Ecology Related Links Link Description Connect to published version Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Mon, 29 Feb 2016, 11:32:17 EST Tue, 01 Mar 2016, 04:01:17 EST Tue, 01 Mar 2016, 05:09:06 EST Tue, 01 Mar 2016, 09:36:10 EST Tue, 01 Mar 2016, 09:39:18 EST Thu, 03 Mar 2016, 12:27:22 EST Fri, 04 Mar 2016, 09:24:33 EST Sat, 25 Nov 2017, 01:31:39 EST Filtered Full Citation counts:   Cited 6 times in TR Web of Science Cited 6 times in Scopus Search Google Scholar Access Statistics: 295 Abstract Views, 2 File Downloads  -  Detailed Statistics Created: Mon, 29 Feb 2016, 11:32:17 EST

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