Document Detail

Trends in body size across an environmental gradient: a differential response in scavenging and non-scavenging demersal deep-sea fish.
MedLine Citation:
PMID:  16191616     Owner:  NLM     Status:  MEDLINE    
Body size trends across environmental gradients are widely reported but poorly understood. Here, we investigate contrasting relationships between size (body mass) and depth in the scavenging and predatory demersal ichthyofauna (800-4800 m) of the North-east Atlantic. The mean size of scavenging fish, identified as those regularly attracted to baited cameras, increased significantly with depth, while in non-scavengers there was a significant decline in size. The increase in scavenger size is a consequence of both intra and inter-specific effects. The observation of opposing relationships, in different functional groups, across the same environmental gradient indicates ecological rather than physiological causes. Simple energetic models indicate that the dissimilarity can be explained by different patterns of food distribution. While food availability declines with depth for both groups, the food is likely to be in large, randomly distributed packages for scavengers and as smaller but more evenly distributed items for predators. Larger size in scavengers permits higher swimming speeds, greater endurance as a consequence of larger energy reserves and lower mass specific metabolic rate, factors that are critical to survival on sporadic food items.
M A Collins; D M Bailey; G D Ruxton; I G Priede
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Proceedings. Biological sciences / The Royal Society     Volume:  272     ISSN:  0962-8452     ISO Abbreviation:  Proc. Biol. Sci.     Publication Date:  2005 Oct 
Date Detail:
Created Date:  2005-09-29     Completed Date:  2006-04-26     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  101245157     Medline TA:  Proc Biol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  2051-7     Citation Subset:  IM    
British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK.
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MeSH Terms
Atlantic Ocean
Body Size*
Body Weights and Measures
Energy Metabolism / physiology
Feeding Behavior / physiology*
Fishes / anatomy & histology*
Models, Theoretical*

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

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