Document Detail

Hunt warm, rest cool: bioenergetic strategy underlying diel vertical migration of a benthic shark.
MedLine Citation:
PMID:  16903055     Owner:  NLM     Status:  MEDLINE    
1. Diel vertical migration (DVM) is a widespread phenomenon among marine and freshwater organisms and many studies with various taxa have sought to understand its adaptive significance. Among crustacean zooplankton and juveniles of some fish species DVM is accepted widely as an antipredator behaviour, but little is known about its adaptive value for relatively large-bodied, adult predatory fish such as sharks. Moreover, the majority of studies have focused on pelagic forms, which raises the question of whether DVM occurs in bottom-living predators. 2. To investigate DVM in benthic predatory fish in the marine environment and to determine why it might occur we tracked movements of adult male dogfish (Scyliorhinus canicula) by short- and long-term acoustic and archival telemetry. Movement studies were complemented with measurements of prey abundance and availability and thermal habitat within home ranges. A thermal choice experiment and energy budget modelling was used to investigate trade-offs between foraging and thermal habitat selection. 3. Male dogfish undertook normal DVM (nocturnal ascent) within relatively small home ranges (-100 x 100 m) comprising along-bottom movements up submarine slopes from deeper, colder waters occupied during the day into warmer, shallow prey-rich areas above the thermocline at night. Few daytime vertical movements occurred. Levels of activity were higher during the night above the thermocline compared to below it during the day indicating they foraged in warm water and rested in colder depths. 4. A thermal choice experiment using environmentally realistic temperatures supported the field observation that dogfish positively avoided warmer water even when it was associated with greater food availability. Males in laboratory aquaria moved into warm water from a cooler refuge only to obtain food, and after food consumption they preferred to rest and digest in cooler water. 5. Modelling of energy budgets under different realistic thermal-choice scenarios indicated dogfish adopting a 'hunt warm - rest cool' strategy could lower daily energy costs by just over 4%. Our results provide the first clear evidence that are consistent with the hypothesis that a benthic marine-fish predator utilizes DVM as an energy conservation strategy that increases bioenergetic efficiency.
David W Sims; Victoria J Wearmouth; Emily J Southall; Jacqueline M Hill; Pippa Moore; Kate Rawlinson; Neil Hutchinson; Georgina C Budd; David Righton; Julian D Metcalfe; Jon P Nash; David Morritt
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of animal ecology     Volume:  75     ISSN:  0021-8790     ISO Abbreviation:  J Anim Ecol     Publication Date:  2006 Jan 
Date Detail:
Created Date:  2006-08-14     Completed Date:  2007-07-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376574     Medline TA:  J Anim Ecol     Country:  England    
Other Details:
Languages:  eng     Pagination:  176-90     Citation Subset:  IM    
Marine Biological Association of the United Kingdom, The Laboratory Citadel Hill, Plymouth PL1 2PB, UK.
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MeSH Terms
Dogfish / metabolism,  physiology*
Energy Metabolism / physiology*
Locomotion / physiology*
Oceans and Seas
Predatory Behavior / physiology*
Telemetry / veterinary

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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