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40
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<a href="http://doi.org/10.1016/B978-0-12-818969-6.00007-8" target="_blank" rel="noreferrer noopener">http://doi.org/10.1016/B978-0-12-818969-6.00007-8</a>
Pages
87-115
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Update Year & Number
January 2021 List
NEOMED College
NEOMED College of Medicine
NEOMED Department
Department of Anatomy & Neurobiology
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Title
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Chapter 7 - Life history, growth, and form
Publisher
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The Bowhead Whale
Date
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2021
2021-01-01
Subject
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life history; Bowhead whale; Balaena mysticetus; growth and form; longevity
Creator
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George JC; Thewissen JGM; Von Duyke A; Breed GA; Suydam RS; Sformo TL; Person BT; Brower Jr HK
Description
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Bering–Chukchi–Beaufort Sea bowhead whales are born at about 4.2m in length and 1000kg, in lead systems along the NW Alaskan coast. Bowheads in the other northern stocks are also born in ice-covered seas. Maximum body lengths (standard measure) can reach 19m. Regarding coloration: the skin is gray on neonates and young calves, and black on yearlings and adults. The size and shape of the chin patch is variable and does not change through life. After adulthood age, the specific areas of the skin lose pigment and turn white around the eye, the peduncle, genital groove, and base of the pectoral limb. Growth is rapid from birth to age 1, followed by a 3- to 4-year growth hiatus. Following the hiatus, the increase in body length is slow to sexual maturity at ~25years and ~13.5m in length. The Iñupiat recognize several growth forms associated with age; these include aġvaaq (neonate), ingutuq (yearling), qairaliq (postyearling), along with several names for large adults. Allometry of the head is marked and likely associated with extreme development of the baleen rack. The head is very large in relation to body—perhaps the largest in Mammalia. The blubber is among the thickest of any cetacean (to ~38cm). Body mass is similar to right whales of similar length; large bowheads can reach 100 metric tons or larger. Longevity can reach 200 or more years. The age of physical maturity is unclear, and adults may increase in length through life. Their ability to navigate ice-covered seas and break through ice to breathe is singular among baleen whales.
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<a href="http://doi.org/10.1016/B978-0-12-818969-6.00007-8" target="_blank" rel="noreferrer noopener"></a>
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journalArticle
2021
Balaena mysticetus
bowhead whale
Breed GA
Brower Jr HK
Department of Anatomy & Neurobiology
George JC
growth and form
January 2021 List
journalArticle
life history
longevity
NEOMED College of Medicine
Person BT
Sformo TL
Suydam RS
The Bowhead Whale
Thewissen JGM
Von Duyke A