Selective Blubber Fatty Acid Mobilization in Lactating Gray Seals (Halichoerus grypus)

2013 ◽  
Vol 86 (4) ◽  
pp. 441-450 ◽  
Author(s):  
Aline Arriola ◽  
Martin Biuw ◽  
Mike Walton ◽  
Simon Moss ◽  
Patrick Pomeroy
Keyword(s):  
Fatty Acid ◽  
Halichoerus Grypus ◽  
Fatty Acid Mobilization ◽  
Gray Seals

731-P: Exercise Training Does Not Alter Resting Fatty Acid Mobilization from Adipose Tissue

Diabetes ◽  
2019 ◽  
Vol 68 (Supplement 1) ◽  
pp. 731-P
Author(s):  
MICHAEL W. SCHLEH ◽  
BENJAMIN J. RYAN ◽  
JENNA B. GILLEN ◽  
PALLAVI VARSHNEY ◽  
KATIE FOUG ◽  
...  
Keyword(s):  
Adipose Tissue ◽  
Fatty Acid ◽  
Exercise Training ◽  
Fatty Acid Mobilization

FRI-288-Physiological levels of cardiotrophin-1 (CT-1) contribute to fasting-induced free fatty acid mobilization

2019 ◽  
Vol 70 (1) ◽  
pp. e522
Author(s):  
David Carneros Trujillo ◽  
Cristina Morilla ◽  
Emilio Jimenez ◽  
Matilde Bustos
Keyword(s):  
Fatty Acid ◽  
Free Fatty Acid ◽  
Fatty Acid Mobilization

Nasal heat and water exchange in gray seals

1987 ◽  
Vol 253 (6) ◽  
pp. R883-R889 ◽  
Author(s):  
L. P. Folkow ◽  
A. S. Blix
Keyword(s):  
Water Exchange ◽  
Ambient Air ◽  
Minute Volume ◽  
Halichoerus Grypus ◽  
Evaporative Water ◽  
Air Temperatures ◽  
Respiratory Heat Loss ◽  
Average Maximum ◽  
Lower Critical Temperature ◽  
Gray Seals

Metabolic rate (MR), expired air temperature (Tex), respiratory frequency (f), respiratory minute volume (V), and skin (Ts) and body (Tb) temperatures were recorded in three gray seals (Halichoerus grypus) at ambient air temperatures (Ta) between -40 and +20 degrees C. At Ta within the thermoneutral zone, MR averaged 3.7 W.kg-0.75, while mean V was 0.26 1.min-1.kg-0.75. At Ta below -11 degrees C [apparent lower critical temperature (Tlc)], both MR and V increased linearly with decreasing Ta. Average maximum MR (9.6 W.kg-0.75) and V (0.57 1.min-1.kg-0.75) were both recorded at Ta of -40 degrees C. Tex decreased with decreasing Ta to an average minimum value of 8 degrees C at Ta of -30 degrees C. The highest Tex recorded was 32 degrees C at Ta of +20 degrees C. At Ta of -20 degrees C, both total respiratory heat loss, with one exception, and respiratory evaporative water loss reached their lowest values. At this Ta, 66% of the heat and 80% of the water added to the inspired air were regained on expiration. We suggest that nasal heat exchange may be of considerable importance for thermal and water balance in many pinnipeds.

Seasonal variability and individual consistency in gray seal (Halichoerus grypus) isotopic niches

2019 ◽  
Vol 97 (11) ◽  
pp. 1071-1077
Author(s):  
K.M. Hernandez ◽  
A.L. Bogomolni ◽  
J.H. Moxley ◽  
G.T. Waring ◽  
R.A. DiGiovanni ◽  
...  
Keyword(s):  
United States ◽  
Seasonal Variability ◽  
Foraging Ecology ◽  
Population Level ◽  
The United States ◽  
Halichoerus Grypus ◽  
Dietary Specialization ◽  
Gray Seal ◽  
Individual Consistency ◽  
Gray Seals

Although it is often assumed that individuals in generalist populations are equivalent, recent research indicates that individual dietary specialization can be common in marine predators. Gray seals (Halichoerus grypus (Fabricius, 1791)) were considered locally extinct in United States waters by 1958 but have since recolonized the region. Although considered generalists, less is known about gray seal foraging ecology in the United States. To address this, we used carbon and nitrogen stable isotope analyses to investigate the foraging niches of adult gray seals in Massachusetts, USA. We examined skin, fur, and blood components to investigate seasonal variability and individual consistency in foraging niches, and serially sampled vibrissae to quantify the degree of individual foraging specialization in this population. Our results suggest that seals shift from coastal foraging habitats before molt to offshore habitats after molt, with a coincident shift from higher to lower trophic-level prey. Adult gray seals also exhibited individual consistency in foraging niches independent of population-level shifts and reflect a generalist population composed of individual foraging specialists. These findings serve as a baseline for subsequent research on gray seals in United States waters that could help to determine the mechanisms which promote individual specialization in this population.

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