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First published online September 5, 2008
Journal of Experimental Biology 211, 2943-2949 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.018176
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Hormonal regulation of glucose clearance in lactating northern elephant seals (Mirounga angustirostris)

Melinda A. Fowler*, Cory D. Champagne, Dorian S. Houser and Daniel E. Crocker

Sonoma State University, Biology Department, 1801 E. Cotati Ave, Rohnert Park, CA 94928, USA


Figure 1
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  		Fig. 1. (A) Plasma glucose levels in adult female elephant seals from time 0 to 180 min post glucose injection. Samples at 180 min post-injection are significantly elevated; early lactation: paired t=8.93; P<0.0001; late lactation: paired t=17.57, P<0.0001; molted females: paired t=5.07, P=0.002. (B) Serum insulin values of adult elephant seals in response to 150 g exogenous glucose from time 0 to 180 min post-injection in early and late lactation and post-molt. Closed circles, early in lactation (5 days postpartum); open circles, late in lactation (22 days postpartum); triangles, fully molted females, late in the molt fast (>20 days fasting). See text for RM ANOVA statistics. Error bars are ± s.e.m.

 

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  		Fig. 2. Percentage increase in plasma insulin over basal values 10 min after glucose injection in relation to the proportion of adipose tissue. F1,4=13.0, P=0.02. Closed circles, early in lactation; open circles, late in lactation; triangles are from late in the molt fast.

 

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© The Company of Biologists Ltd 2008