Blood pressure in the Greenland shark as estimated from ventral aortic elasticity

Author:

Shadwick Robert E.1ORCID,Bernal Diego2ORCID,Bushnell Peter G.3ORCID,Steffensen John F.4ORCID

Affiliation:

1. Department of Zoology, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada

2. Department of Biology, University of Massachusetts, Dartmouth, MA 02747, USA

3. Department of Biological Sciences, Indiana University South Bend, IN USA

4. Marine Biological Section, University of Copenhagen, 3000 Helsingør, Denmark

Abstract

We conducted in vitro inflations of freshly excised ventral aortas of the Greenland shark, Somniosus microcephalus, and used pressure-diameter data to estimate the point of transition from high to low compliance, which has been shown to occur at the mean blood pressure in other vertebrates including fishes. We also determined the pressure at which the modulus of elasticity of the aorta reached 0.4MPa, as occurs at the compliance transition in other species. From these analyses we predict the average ventral aortic blood pressure in S. microcephalus to be about 2.3-2.8kPa, much lower than reported for other sharks. Our results support the idea that this species is slow moving and has a relatively low aerobic metabolism. Histological investigation of the ventral aorta show that elastic fibres are present in relatively low abundance and loosely connected, consistent with this aorta to have high compliance at a relatively low blood pressure.

Funder

Natural Sciences and Engineering Research Council of Canada

National Science Foundation

Det Frie Forskningsråd

Carlsbergfondet

Publisher

The Company of Biologists

Subject

Insect Science,Molecular Biology,Animal Science and Zoology,Aquatic Science,Physiology,Ecology, Evolution, Behavior and Systematics

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