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Time and energy constraints in pinniped lactation.
MedLine Citation:
PMID:  18811346     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Previous reviews have recognized patterns of lactation in pinnipeds divided along phylogenetic lines. This study extended previous models of lactation in pinnipeds by explicitly taking into account all the energetic costs to mothers. Based on an analysis of time-energy budgets, the feasible lactation strategy for a species can be shown to depend on body mass. Due to increased metabolic costs of maintenance, species with a large body mass cannot normally sustain lactation by foraging during lactation unless they have access to rich local prey resources. Consequently, large pinnipeds must normally sustain lactation from body reserves. This disadvantage is compensated in large pinnipeds by freedom to forage in support of offspring at greater range whereas small pinnipeds are restricted to foraging within the locality of the pupping colony. In the absence of correlations between major life-history variables and body mass in pinnipeds, the principal patterns of lactation are likely to be different solutions to the trade-off between foraging on a relatively rich prey resource at long range and foraging on a poorer prey resource within a restricted range. Hence phylogeny may be less important than adaptation in the evolution of pinniped lactation.
Authors:
I L Boyd
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The American naturalist     Volume:  152     ISSN:  0003-0147     ISO Abbreviation:  Am. Nat.     Publication Date:  1998 Nov 
Date Detail:
Created Date:  2008-09-24     Completed Date:  2009-01-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2984688R     Medline TA:  Am Nat     Country:  United States    
Other Details:
Languages:  eng     Pagination:  717-28     Citation Subset:  -    
Affiliation:
British Antarctic Survey, Natural Environment Research Council, Cambridge CB3 OET, United Kingdom.
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