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Diving Seals and Meditating YogisStrategic Metabolic Retreats$
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Robert Elsner

Print publication date: 2015

Print ISBN-13: 9780226246710

Published to Chicago Scholarship Online: January 2016

DOI: 10.7208/chicago/9780226247045.001.0001

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PRINTED FROM CHICAGO SCHOLARSHIP ONLINE (www.chicago.universitypressscholarship.com). (c) Copyright University of Chicago Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in CHSO for personal use.date: 03 December 2021

Marine mammal divers

Marine mammal divers

Chapter:
(p.15) 2 Marine mammal divers
Source:
Diving Seals and Meditating Yogis
Author(s):

Robert Elsner

Publisher:
University of Chicago Press
DOI:10.7208/chicago/9780226247045.003.0002

This chapter discusses the diving capacities of marine mammals, focusing on certain species of seal: ringed seals, harbor seals, harp seals, gray seals, hooded seals, Antarctic Weddell seals, and elephant seals. Maximum diving times of seals have been recorded in ranges from about fifteen minutes (ringed seals) to more than two hours (northern elephant seals); depths range from seventy (ringed seals) to a thousand meters (hooded seals and elephant seals). The seal must depend upon its steadily declining respiratory resources throughout the dive. Cessation of breathing sets the course toward progressive asphyxia, advancing inexorably unless reversed by timely respiratory exchange. The overall effect limits the range, duration, and depth of underwater excursions, depending on the animal's breath-holding endurance.

Keywords:   diving seals, ringed seals, harbor seals, harp seals, gray seals, hooded seals, Antarctic Weddell seal, elephant seals, breathing cessation, asphyxia

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