David J. Chivers – författare
Visar alla böcker från författaren David J. Chivers. Handla med fri frakt och snabb leverans.
3 produkter
3 produkter
1 774 kr
Skickas inom 7-10 vardagar
However well the anatomy of the gastro-intestinal tracts of a wide range of mammals is described and quantified, there can be no real explanation of observed patterns without consideration of the mechanical and chemical properties of the food consumed, and of the digestive stages involved in its processing. This book aims to integrate findings from the many different types of investigations of mammalian digestive systems into a coherent whole. Using the themes of food, form and function, researchers discuss models of digestive processes, linking this with evolutionary aspects of food utilisation. Macroscopic and ultrastructural studies of the gastro-intestinal tract are also presented, as are physiological, ecological and biochemical aspects of the digestion of different food types. The book ends with an integrative chapter, bringing together the themes running through the earlier sections.
1 064 kr
Skickas inom 10-15 vardagar
This book results from a two-day symposium and three-day workshop held in Cambridge between March 22nd and March 26th 1982 and sponsored by the Primate Society of Great Britain and the Anatomical Society of Great Britain and Ireland. More than 100 primatologists attended the symposium and some 35 were invited to participate in the workshop. Speakers from Prance, Germany, the Netherlands, South Africa and the U. S. A. , as weIl as the U. K. , were invited to contribute. In recent years feeling had strengthened that primatologists in Europe did not gather together sufficiently often. Distinctive tradit ions in primatology have developed in Germany, France, the Netherlands, Italy and the U. K. in particular, and it was feIt that attempts to blend them could only benefit primatology. Furthermore, studies of primate ecology, behaviour, anatomy, physiology and evolution have reached the points where further advances depend on inter-disciplinary collaboration. It was resolved to arrange a regular series of round table discussions on primate biology in Europe at the biennial meeting of the German Society for Anthropology and Human Genetics in Heidel berg in September 1979, where Holger Preuschoft organised sessions on primate ecology and anatomy. In June 1980 Michel Sakka convened a most effective working group in Paris to discuss cranial morphology and evolution. In 1982 it was the turn of the U. K.
535 kr
Skickas inom 10-15 vardagar
The hand commonly is considered to have exerted great influence on the evolution of typically human characteristics, like upright posture, stereoscopic vision, «manipulative» handling of parts of the environment. The German term «Begreifen», which is commonly used for the understanding of complex relationships in a generalised, abstract sense, always implies the original meaning of seizing objects with the aid of the hands. The hands are also of greatest importance for the survival of the other, non-human primates. Hands are absolutely essential for locomotion in an arboreal habitat, and the intake of food is dependant on the use of the hands as well: primates very rarely take in food directly with their mouths, in the wast majority of cases they seize food items with their hands. Even drinking is often performed by dipping the hand into the water and licking the drops from hand and forearm. An organ of such importance will very probably be «adapted» to its «function». This statement is made so often, that any further considerations seem superfluous. Nobody doubts, that the hands of primates are highly adaptive organs, the general form and internal structure of which are closely related to the necessities of life. However, if one tries to go beyond this general statement, he finds himself confront ed with several problems: First of all, a point which W. GUTMANN has emphasized repeatedly: according to the results obtained by genetics, the first thing to appear is the mutated character.