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Allometric scaling of lung volume and its consequences for marine turtle diving performance. | LitMetric

Allometric scaling of lung volume and its consequences for marine turtle diving performance.

Comp Biochem Physiol A Mol Integr Physiol

Stazione Zoologica Anton Dohrn, Villa Comunale 1, 80121 Naples, Italy.

Published: October 2007

AI Article Synopsis

Article Abstract

Marine turtle lungs have multiple functions including respiration, oxygen storage and buoyancy regulation, so lung size is an important indicator of dive performance. We determined maximum lung volumes (V(L)) for 30 individuals from three species (Caretta caretta n=13; Eretmochelys imbricata n=12; Natator depressus n=5) across a range of body masses (M(b)): 0.9 to 46 kg. V(L) was 114 ml kg(-1) and increased with M(b) with a scaling factor of 0.92. Based on these values for V(L) we demonstrated that diving capacities (assessed via aerobic dive limits) of marine turtles were potentially over-estimated when the V(L)-body mass effect was not considered (by 10 to 20% for 5 to 25 kg turtles and by >20% for turtles > or =25 kg). While aerobic dive limits scale with an exponent of 0.6, an analysis of average dive durations in free-ranging chelonian marine turtles revealed that dive duration increases with a mass exponent of 0.51, although there was considerable scatter around the regression line. While this highlights the need to determine more parameters that affect the duration-body mass relationship, our results provide a reference point for calculating oxygen storage capacities and air volumes available for buoyancy control.

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Source
http://dx.doi.org/10.1016/j.cbpa.2007.05.010DOI Listing

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