A world of categones devmd of spirit waits for life to return. Saul Bellow, Humboldt's Gift The stock-in-trade of communicating hypotheses about the historical path of evolution is a graphical representation called a phylogenetic tree. In most such graphics, pairs of branches diverge from other branches, successively marching across abstract time toward the present. To each branch is tied a tag with a name, a binominal symbol that functions as does the name given to an individual human being. On phylogenetic trees the names symbolize species. What exactly do these names signify? What kind of information is communicated when we claim to have knowledge of the following types? "Tetonius mathewzi was ancestral to Pseudotetonius ambiguus. " "The sample of fossils attributed to Homo habzlis is too variable to contain only one species. " "Interbreeding populations of savanna baboons all belong to Papio anubis. " "Hylobates lar and H. pileatus interbreed in zones of geographic overlap. " While there is nearly universal agreement that the notion of the speczes is fundamental to our understanding of how evolution works, there is a very wide range of opinion on the conceptual content and meaning of such particular statements regarding species. This is because, oddly enough, evolutionary biolo gists are quite far from agreement on what a species is, how it attains this status, and what role it plays in evolution over the long term.

Primate Adaptation and Evolutionis the only recent text published in this rapidly progressing field. It provides you with an extensive, current survey of the order Primates, both living and fossil. By combining information on primate anatomy, ecology, and behavior with the primate fossil record, this book enables students to study primates from all epochs as a single, viable group. It surveys major primate radiations throughout 65 million years, and provides equal treatment of both living and extinct species. ï Presents a summary of the primate fossilsï Reviews primate evolutionï Provides an introduction to the primate anatomyï Discusses the features that distinguish the living groups of primatesï Summarizes recent work on primate ecology

This book represents an important meeting ground in the primatology field by exploring the various primate models that have been used in the reconstruction of early human behavior. While some models are based on the proposition that a key behavioral feature such as hunting, eating of seeds or monogamous mating led to the evolutionary separation of apes and humans, other models suggest that one primate species, such as the baboon or chimpanzee, best exemplifies the behavior of our early ancestors. Several contributors to the book take the position that no single primate is a good model and contend instead that a model must be eclectic. One of the more innovative essays suggests that ancestral behavioral states can, in fact, be derived by comparing the behavior of all living hominid (ape and human) species. Additionally, several other contributors analyze and discuss the concept of model-making, noting deficiencies in earlier models while offering suggestions for future development. Although it is true that a powerful conceptual model for reconstructing hominid behavior does not yet exist, The Evolution of Human Behavior: Primate Models suggests ways one may be constructed based on behavioral ecology and evolutionary theory.

Essay from the year 2003 in the subject Biology - Evolution, grade: 1, Oxford Brookes University, language: English, abstract: Prosimians are a suborder of primates and include lemurs, lorises and tarsiers. Although specialised in many respects, living prosimians generally retain more primitive features than do anthropoids (the other suborder of primates); and in many aspects of teeth, skulls and limbs, they reserve a morphology similar to that found in primates of the Eocene epoch, 50 to 40 million years ago. These primitive features have led many scientists to believe that the study of prosimian behaviour might give us some insights into the behaviour of ancestral primates and primate origins. I am going to explore what has been the major ‘classic’ interpretation of the behaviour of the earliest primates in terms of activity rhythm, locomotion and social behaviour based on the study of modern prosimians and how more recent studies have changed our views on these. Further I am going to explore the major contending views for ecological factors that brought about prosimian origins.

I first became involved in research into primate behavior and ecology in 1968, over 40 years ago, driven by a quest for a better understanding of the natural context of primate evolution. At that time, it was virtually unknown that primates can exploit exudates as a major food source. I was certainly unaware of this myself. By good fortune, I was awarded a postdoctoral grant to work on lemurs with Jean-Jacques Petter in the general ecology division of the Muséum National d’Histoire Naturelle in Brunoy, France. This provided the launching-pad for my first field study of lesser mouse lemurs in Madagascar, during which I gained my initial inklings of exudate feeding. It was also in Brunoy that I met up with Pierre Charles- Dominique, who introduced me to pioneering observations of exudate feeding he had made during his field study of five lorisiform species in Gabon. This opened my eyes to a key feeding adaptation that has now been reported for at least 69 primate species in 12 families (Smith, Chap. 3) – almost 20% of extant primate species. So exudativory is now firmly established as a dietary category for p- mates, alongside the long-recognized classes of faunivory (including insectivory), frugivory, and folivory. Soon after I encountered Charles-Dominique, he published the first synthetic account of his Gabon field study in a French language journal (Charles-Dominique 1971).

Understanding evolutionary processes requires knowledge of the context in which specific events took place, including the chronological and the environmental contexts. Contributions to this special issue of 'Folia Primatologica' highlight the importance of an accurate chronological context for interpretations of the origins of primates and of their response to the onset of Cenozoic global cooling. They discuss the influence of palaeogeography and climate change on the first appearance of primates in the fossil record, the evolution and dispersals of the Miocene apes and of early representatives of the genus 'Homo', the Old World monkey radiation and primate visual signalling. Also considered is the effect humans are now having on the course of primate evolution, as seen in recent megafaunal extinctions in Madagascar and as exemplified by the complexity of parameters involved in informing future conservation strategies. The broad taxonomic, chronological and methodological scope of this publication creates a valuable overview of the diversity of environmental parameters involved in shaping primate evolution. It encourages new perspectives and highlights important areas for future interdisciplinary research in evolutionary primatology.