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Wells: Octopus - Physiology & Behaviou

Wells, Martin John

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ISBN 10: 0470991976 / ISBN 13: 9780470991978
Published by U.S.A.: John Wiley & Sons Inc, 1978
Condition: Near Fine Hardcover
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HARDBACK BOOK AND DUST JACKET IN NEAR FINE CONDITION,FIRST AMERICAN EDITION. Bookseller Inventory # 302050

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Bibliographic Details

Title: Wells: Octopus - Physiology & Behaviou

Publisher: U.S.A.: John Wiley & Sons Inc

Publication Date: 1978

Binding: Hardcover

Book Condition: Near Fine

Dust Jacket Condition: Near Fine

Edition: 1st Edition

About this title

Synopsis:

between the organ systems of cephalopods and those of less ambitious molluscs. Octopus does, as we would predict, live close to the limits set by its own physiology. The circulation, to take one example, is barely adequate for such an active animal, mainly because of the absence of any system for pack­ aging the blood pigment; haemocyanin in solution is a poor oxygen carrier. Cephalopod blood can transport less than 5 millilitres of oxygen per 100 ml of blood (compared with about 15 vol% in fish) and the whole supercharged system of triple hearts, high blood pressure and pulsating blood vessels succeeds only in returning blood that retains less than 30% of its dissolved oxygen by the time it reaches the gills. This at rest; the effect of exercise is immediate and surprisingly long­ lasting even in octopuses as small as 300 g, which must very swiftly run into oxygen debt when they flee from predators or pursue their prey (Sections 3.2.2, 3.2.4). Digestion, too would seem to be limiting. As with other molluscs, digestion in Octopus is based on secretion­ absorption cycles by a massive diverticulum of the gut, an adequate system in a less hectic past, but scarcely appropriate in a predator that must be an opportunist in the matter of feeding. Octopus feeds mainly at night, and spends a great deal of every day sitting at home.

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