[MARMAM] New publication concerning growth rates and maternal investment in fur seals

Amy Lorenz amylorenz at ymail.com
Mon Oct 18 10:31:18 PDT 2010


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On Oct 18, 2010, at 1:10 AM, Layla Osman <laylaosman at gmail.com> wrote:

> I wish to note the availability of one recent publication concerning
> Growth rates and maternal investment in Fur seals.  Abstract appear
> below and the paper is available at:
> 
> http://www.bioone.org/doi/abs/10.1644/09-MAMM-A-197.1
> 
> Growth rates and differential investment in male and female Juan
> Fernandez fur seal pups
> 
> LAYLA P. OSMAN,* CARLOS A. MORENO, AND ANDREW W. TRITES
> 
> Instituto de Ecologı´a y Evolucio´n, Universidad Austral de Chile,
> Casilla 567, Valdivia, Chile (LPO, CAM)
> Marine Mammal Research Unit, Fisheries Centre, Room 247, 2202 Main
> Mall, AERL, University of British Columbia,
> Vancouver, British Columbia V6T 1Z4, Canada (AWT)
> * Correspondent: laylaosman at gmail.com
> 
> Male Juan Ferna´ndez fur seals (Arctocephalus philippii) are
> significantly larger than females at birth and show
> extreme dimorphism as adults. We investigated morphological
> differences among male and female pups using a
> cross-sectional sampling design to evaluate whether pup growth rates
> were sex-specific during the breeding
> season. We characterized growth rates using mass, length, and girth
> and found that length was the least variable
> measure of body growth (based on the coefficients of variation for the
> 3 measures of body size). Male pups were
> heavier on average than female pups on any given day of sampling but
> did not grow faster than females. No
> significant differences were noted in the body conditions of male and
> female pups. These findings suggest that
> the sexual differences among pups of A. philippii originate before
> birth and are not accentuated while suckling
> during the breeding season. DOI: 10.1644/09-MAMM-A-197.1.
> 
> Key words: Arctocephalus philippii, Juan Ferna´ndez Archipelago, Juan
> Ferna´ndez fur seals, maternal investment, pup
> growth rates, sexual dimorphism, sexual variatio
> 
> Layla Osman
> 
> --
> Dr. Layla P. Osman
> Instituto de Ecología y Evolución
> Universidad Austral de Chile
> P.O. Box 567, Valdivia, Chile.
> Phone: 56-63-221486
> Fax: 56-63-221344
> Cell phone: 76681230
> www.ecolevol.cl
> 
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