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The Vertebrate Integument Volume 2 - Structure, Design and Function (Paperback, Softcover reprint of the original 1st ed. 2015)
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The Vertebrate Integument Volume 2 - Structure, Design and Function (Paperback, Softcover reprint of the original 1st ed. 2015)
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The emphasis in this volume is on the structure and functional
design of the integument. The book starts with a brief introduction
to some basic principles of physics (mechanics) including
Newton’s Three Laws of Motion. These principles are subsequently
used to interpret the problems animals encounter in motion. It is
in only the last 40 or so years that we have begun to understand
how important a role the integument plays in the locomotion of many
marine vertebrates. This involves the crossed-fiber
architecture, which was first discovered in a classic study on
nemertean worms. As a design principle we see that the
crossed-fiber architecture is ubiquitous in nature. Research on
some of the most dynamic marine vertebrates of the oceans – tuna,
dolphins and sharks, and the extinct Jurassic ichthyosaurs –
shows precisely how the crossed-fiber architecture contributes to
high-speed swimming and (in lamnid sharks) may even aid in
energy conservation. However, this design principle is not
restricted to animals in the marine biota but is also found as far
afield as the dinosaurs and, most recently, has been revealed as a
major part of the microstructure of the most complex derivative of
the integument, the feather. We see that a variety of
phylogenetically diverse vertebrates take to the air by using skin
flaps to glide from tree to tree or to the ground, and present
detailed descriptions of innovations developed in pursuit of
improved gliding capabilities in both extinct and modern day
gliders. But the vertebrate integument had even greater things in
store, namely true or flapping flight. Pterosaurs were the first
vertebrates to use the integument as a membrane in true flapping
flight and these interesting extinct animals are discussed on the
basis of past and cutting-edge research , most intriguingly with
respect to the structure of the flight membrane. Bats, the only
mammals that fly, also employ integumental flight membranes.
Classic research on bat flight is reviewed and supplemented with
the latest research, which shows the complexities of the wing beat
cycle to be significantly different from that of birds, as revealed
by particle image velocimetry. The book’s largest chapter is
devoted to birds, given that they make up nearly half of the over
22,000 species of tetrapods. The flight apparatus of birds is
unique in nature and is described in great detail, with innovative
research highlighting the complexity of the flight structures, bird
flight patterns, and behavior in a variety of species. This is
complimented by new research on the brains of birds, which shows
that they are more complex than previously thought. The feather
made bird flight possible, and was itself made possible by
β-keratin, contributing to what may be a unique biomechanical
microstructure in nature, a topic discussed in some depth. A highly
polarized subject concerns the origin of birds and of the feather.
Alleged fossilized protofeathers (primal simple feathers) are
considered on the basis of histological and taphonomic
investigative studies in Chapter 6. Finally, in Chapter 7 we
discuss the controversies associated with this field of research.
Professor Theagarten Lingham-Soliar works at the Nelson Mandela
Metropolitan University, Port Elizabeth and is an Honorary
Professor of Life Sciences at the University of KwaZulu-Natal.
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