During pubertal development of the testes, germ cells pass initially through the complete succession of spermatogenic differentiation. Using the golden hamster as a model, this volume presents a comprehensive analysis of that establishing period of mammalian spermatogenesis. Detailed morphological and cell kinetic data of the pubertal seminiferous epithelium reveal a level of cellular organization and synchronization coming near to the adult situation. Characteristic, temporarily occurring perturbations of spermatogenic progression are related to specific delays of Sertoli or Leydig cell maturation, respectively. These results emphasize and specify the close structural and functional interdependence of germ and somatic cell development.

Interest in the way in which symbiotic bacteria can manipulate reproduction in their invertebrate hosts has risen rapidly in recent years. Discoveries have ranged from bacteria that can determine the likelihood of their fruitfly hosts finding a partner to mate with to bacteria infecting woodlice that can cause sex changes in offspring. This unique book is the first comprehensive and systematic review of the 'reproductive parasites'. Written by leading experts in the field, it explores not only the intriguing theoretical questions raised by the relationships between symbiotic bacteria and their hosts, but also discusses a number of exciting practical applications, such as potential for controlling the reproduction of disease transmitting insects. Chapters on sex reversal, sex-ratio distortion, and evolution are also included. This timely and up-to-date volume will be important reading for researchers and students in the fields of entomology, evolution, ecology, genetics, and microbiology.

Estrogen and testosterone have an important impact on the operation of certain parts of the brain. This book describes the neurobiological bases for the understanding of the interactions between these sex hormones and the brain. It covers a broad range of topics, extending from the molecular and cellular processes, through the action of steroids on neurotransmission, all the way to defining the brain circuitry involved in both male and female behavior. This volume presents a snapshot of the rapidly advancing field of reproductive neuroendocrinology and will be an important resource for graduate students and professionals in neuroscience and animal behavior.

After the primordial Earth produced the miracle of life, a remarkable and strange "accident" soon came to pass. This accident was sex - a new creation that would irrevocably alter the course of life on our planet. This magnificent event would engender the multitude of life forms that have come to walk, swim, and fly upon this Earth. Dr. Maxwell takes us on an eye-opening tour of the bizarre, fascinating, infinitely diverse world of sexual relations. From single-celled organisms to human beings, Maxwell unlocks the secrets of survival, describing in rich detail the matings, meetings, and sexual make-ups of a generous sampling of land and sea creatures. The story of sex can be startling and savage: the female firefly uses her glowing lantern to lure male fireflies of related species by flashing the other species' mating code; the males are no good as mates but they make a delicious meal. Maxwell's story also includes an in-depth look at the uniqueness of human sexuality - he reveals why human beings, inheritors of an unusual collection of sexual traits, are considered the "sexiest" of the primates. The sex imperative - the irresistible impulse to engage in sexual relations - has enabled animals to share their genes and evolve. Maxwell traces the progress of sex from the simple sharing of genes between cells to the elaborate courtship rituals that developed so sperm could merge with egg. In the effort to join sperm and egg, species have developed some astounding and unusual sexual adaptations. As Maxwell vividly describes the sex lives of various creatures, he attests to the resiliency and amazing adaptability of life to its everchanging environment. By focusing on the diversity of animalsexual relationships, Maxwell enables us to question the very basis of sexuality: What is sex? Why did it evolve? How does sexuality and survival shape the social behavior of animals and humans? The sex imperative is indeed the driving force behind Darwin's theory of random varia

Life histories can be defined as the means by which individuals (or more precisely genotypes) vary their age- or stage-specific expenditures of reproductive effort in response to genetic, phenotypic, and environmental correlates of survival and fecundity. Life histories reflect the expression of traits most closely related to individual fitness, such as age and size at maturity, number and size of offspring, and the timing of the expression of those traits throughout an individual's life. In addition to addressing questions of fundamental importance to ecology and evolution, life-history research plays an integral role in species conservation and management. This accessible primer encompasses the basic concepts, theories, and applied elements of life history evolution, including patterns of trait variability, underlying mechanisms of plastic/evolutionary change, and the practical utility of life-history traits as metrics of species/population recovery, sustainable exploitation, and risk of extinction. Empirical examples are drawn from the entire spectrum of life. A Primer of Life Histories is designed for readers from a broad range of academic backgrounds and experience including graduate students and researchers of ecology and evolutionary biology. It will also be useful to a more applied audience of academic/government researchers in fields such as wildlife biology, conservation biology, fisheries science, and the environmental sciences.

Not since the early 1970s has there been an attempt to describe and illustrate the anatomy of the developing mouse embryo. More than ever such material is needed by biologists as they begin to unravel the molecular mechanisms underlying development and differentiation. After more than ten years of painstaking work, Matt Kaufman has completed The Atlas of Mouse Development--the definitive account of mouse embryology and development.
For all those researching or studying mammalian development, The Atlas of Mouse Development will be the standard reference work for many years to come.
Key Features
* Provides a comprehensive sequential account of the development of the mouse from pre-implantation to term
* Contains clear and concise descriptions of the anatomical features relevant to each stage of development
* Large format for easy use
* Contains explanatory notes and legends, and more than 180 meticulously labeled plates, 1,300 photographs of individual histological sections, and 200 electron micrographs, illustrating:
* Intermittent serial histological sections through embryos throughout embryogenesis and organogenesis
* Differentiation of specific organs and organ systems, including the spinal cord, eyes, gonads, kidneys, lungs and skeletal system
* External appearance of intact embryos throughout development

This book is intended for the senior undergraduate (Honours student) in genetics, and for the postgraduate who wants a survey of the whole field or information on a special area within it. In order to cater for readers with such different requirements, I have made the list of references unusually large for a textbook. It includes classical papers as well as very recent ones (to the end of 1974); reviews as well as specialized articles; elementary expositions from Scientific American as well as highly technical papers from journals on genetics and molecular biology. In areas of active research, I have given preference to the latest references, which will lead the reader to earlier ones. In addition to the references at the end of each chapter, a bibliography at the end of the book lists relevant books and general reviews. Apart from the first chapter, the book is not written as a history of mutation research; but throughout I have tried to emphasize the continuity of the problems, concepts and ideas. The reader will find many examples of this. Muller's once famous and then almost forgotten classification of genes by their action has now been given biochemical reality by studies of gene action in vitro. The problem of whether mutations can arise in non-replicating genomes is one of the oldest in mutation research; yet an unequivocal solution was obtained only recently with bacteriophage.

Mammalian Endocrinology and Male Reproductive Biology provides comprehensive and current coverage of the area of endocrinology and male reproductive biology, covering not just humans, but mammals in general. Written by international experts in their respective fields, this multi-author book also covers the latest developments in genomics of androgen action and male infertility. The book begins by covering sexual dimorphism in the central nervous system; structure, control of secretion and function of GnRH; and gonadotropins of pituitary origin and their role in gonadal functions. This is followed by an account of hormonal regulation of spermatogenesis, and the role of apoptosis in this process. Subsequent chapters center around epididymis, regulation of growth and function, and sperm motility regulation. The last chapters in the book discuss the structure and function of male accessory sex glands with associated pathologies as well as recent updates in male contraception, mechanism of androgen action, and genomics of male infertility. Wherever necessary, tables and figures have been added for a better understanding. Each chapter is appropriately referenced and contains current information on the latest developments in the field.

A small informal symposium on "Molecular Genetics" was organized by us on behalf of the "Gesellschaft Deutscher Naturforscher und Arzte" and took place in Berlin in October 1967. There were about 40 partici pants from Europe and the United States. Molecular Genetics represents today an extraordinarily comprehensive research field. Therefore the organizers of the symposium had the choice either of limiting the meeting to a particular topic or of covering a wider selection of current problems. The latter alternative was chosen. The fields of research of the participants covered the broad range of scientific problems in which molecular genetics is nowadays involved: Genetic code; chemistry and biosynthesis of proteins; mutation, modification and reactivation of nucleic acids; biochemistry of regulation; comple mentation; structure; replication and function of viruses, etc. The meeting took place in the Hotel Schweizerhof where the partici pants were also accommodated. This permitted close contact between the participants outside of the official program and allowed informal discussions, which started during the meetings, to be continued after wards. Owing to the informal nature of these discussions, only a part of them could be included in this book. Berlin, September 1968 H. G. WITTMANN H. SCHUSTER Contents List of Participants . . . . . . . . . . .... VII I. Structure and Function of Ribosomes; Complementation Complementation and Dominance Relationsship between Protein Subunits. By J. R. S. FINCHAM. . . . . . . . . . . . . . . Ribosomal Proteins of E. coli and Yeast. By E. KALTSCHMIDT, V. RUDLOFF, G. STOFFLER, A. CHERSI, M. DZIONARA, D. DOl\IIER, and H. G. WITTMANN . . . . . . . . . . . . . . .. . . 5 ."

This book describes the methodology for predicting the genetic merit of animals in the context of genetic improvement in an animal breeding programme. Information on an animal and its relatives, on either the characteristic to be improved or from other traits, can be used to predict the animal's genetic merit, taking account of the relationships between measurements and the economic values of traits. The methodology is developed from first principles, without unnecessary detail or complexity, and all the required statistical and mathematical concepts are fully described in the book. The text discusses the methods for combining different sources of information and illustrates their use with examples of breeding programmes in cattle, sheep, pigs and poultry. A series of questions with detailed answers is included in the book, to help reinforce the ideas and provide some practical experience in the prediction of genetic merit. The text is aimed at final year undergraduate and first year postgraduate students of quantitative genetics and animal breeding.

Essential Reproduction provides an accessible account of the fundamentals of reproduction within the context of cutting-edge knowledge and examples of its application. The eighth edition of this internationally best-selling title provides a multidisciplinary approach integrating anatomy, physiology, genetics, behaviour, biochemistry, molecular biology and clinical science, to give thorough coverage of the study of mammalian reproduction. Key features: Contains discussion of the latest on conceptual, informational and applied aspects of reproduction New pedagogical features such as clinical case studies at the end of each chapter Better use of boxed material to improve separation of narrative text from ancillary information Highlighted key words for ease of reference relate to summary of key points Introduction now split into two sections Expanded content in Fetal challenges, and Society and reproduction Substantial rearrangement and updating in Making sperm, Controlling fertility, and Restoring fertility

The various genera and species of the Orthopteran sub-family Tet- tigidae may be recognized under several names in the reports of a number of entomologists. They range from the form Bulla of LINNE (1767), whose figures are unmistakable, to the recent descriptions of SCUDDER (1900), HANCOCK (1902), and other orthoptologists. Such words as Tettix, Tettiginae and Tettigidae apparently were derived from "tettix" of Greek origin, meaning grasshopper. The common name, "Grouse locust", has probably been applied because of a fanci- ful resemblance of some of these insects to the grouse (Tetraoninae). B I 0 LOG Y 0 F THE GR 0 USE L 0 C U S T S The Distinguishing Characteristics. The following discussion con- cerning the characteristics which distinguish the Grouse Locusts is largely from the detailed descriptions by HANCOCK (1902) and Ro- BERTSON (1915). (See Fig. I). FIG. 1. Lateral, dorsal and frontal aspects of the body of a typical grouse locust, Acrydium (From HANCOCK) They are among the smallest of the Orthoptera. The extremely de- veloped apical process of the pronotum extends backward over the 30 THE GENETICS OF THE TETTIGIDAE (GROUSE LOCUSTS) Explanation of Plate I (All figures from HANCOCK, 1902) FIG. 1. Choriphyllum /oliatum HANCOCK. Female from Jamaica. FIG. 2. Nymph of Acrydium obscurus HANCOCK. FIG. 3. Tettigidea parvipennis preparing the burrow for the eggs. FIG. 4. Acrydium granulatus SCUDDER. Female. FIG. 5 and 6. Dorsal and profile views of posterior abdominal appen- dages of a male Acrydium hancocki MORSE.

Providing a review of the recent advances and technologies in the rapidly expanding field of genetics, embryology and molecular biology, this book also investigates the possibilities for future research and development. There are sections covering manipulation of the embryo, and the mapping and engineering of the genome. Topics discussed range from nuclear transfer to the possibilities and techniques involved in the development of xenotransplantation.

Involvement with equine reproduction is very common for the veterinarian in practice, and there is enormous demand for continuing education, particularly in the light of recent changes in science and practice, such as the routine use of ultrasound, improved standards of foal care, and the importance of artificial insemination. The 22 contributing authors, an international blend of specialist equine practitioners and university clinicians, provide by means of superbly illustrated questions and full explanatory answers, a comprehensive, up-to-date, enjoyable and easily read source of information on equine reproduction. Over 30 cases concern the use of ultrasound in the management of the broodmare, some 50 cases cover foal care and common medical /surgical conditions, and there are over 30 cases on the stallion and artificial insemination, plus rarer conditions such as dystocia and foaling trauma. The random order of the cases and the self-assessment format, enable readers to think fully about a problem and devise a solution, just as they would in their daily work. The book appeals equally to veterinarians in training, in practice and in preparation for higher qualifications.

Life histories can be defined as the means by which individuals (or more precisely genotypes) vary their age- or stage-specific expenditures of reproductive effort in response to genetic, phenotypic, and environmental correlates of survival and fecundity. Life histories reflect the expression of traits most closely related to individual fitness, such as age and size at maturity, number and size of offspring, and the timing of the expression of those traits throughout an individual's life. In addition to addressing questions of fundamental importance to ecology and evolution, life-history research plays an integral role in species conservation and management. This accessible primer encompasses the basic concepts, theories, and applied elements of life history evolution, including patterns of trait variability, underlying mechanisms of plastic/evolutionary change, and the practical utility of life-history traits as metrics of species/population recovery, sustainable exploitation, and risk of extinction. Empirical examples are drawn from the entire spectrum of life. A Primer of Life Histories is designed for readers from a broad range of academic backgrounds and experience including graduate students and researchers of ecology and evolutionary biology. It will also be useful to a more applied audience of academic/government researchers in fields such as wildlife biology, conservation biology, fisheries science, and the environmental sciences.

Poultry are farmed and are important sources of protein throughout the world. All students of agriculture are likely to be required to study poultry science to at least an introductory level. However, hitherto there has been no suitable textbook serving the needs of students taking a general introductory course in poultry science. This book aims to fill this gap. It explains the science underlying the productive processes of growth, reproduction and incubation. The applications of nutrition and breeding techniques are described. The book covers all the commercially important poultry species, including turkeys, quail, guinea fowls, ducks and geese, but the main emphasis is on the domestic fowl. The overall purpose is to provide the student with an understanding of the characteristics and physiological responses of domesticated poultry, with particular reference to production. The emphasis is on modelling responses rather than on biochemical and hormonal processes. The author stresses basic concepts and models, rather than practical production systems, so that the book should have worldwide applicability. The book represents a key text for degree and advanced diploma courses in agriculture.

Insects display a staggering diversity of mating and social behaviours. Studying these systems provides insights into a wide range of evolutionary and behavioural questions, such as the evolution of sex, sexual selection, sexual conflict, and parental care. This edited volume provides an authoritative update of the landmark book in the field, The Evolution of Insect Mating Systems (Thornhill and Alcock, 1983), which had such a huge impact in shaping adaptationist approaches to the study of animal behaviour and influencing the study of the evolution of reproductive behaviour far beyond the taxonomic remit of insects. This accessible new volume brings the empirical and conceptual scope of the original book fully up to date, incorporating the wealth of new knowledge and research of the last 30 years. It explores the evolution of complex forms of sex determination in insects, and the role of sexual selection in shaping the evolution of mating systems. Selection arising via male contest competition and female choice (both before and after copulation) are discussed, as are the roles of parasites and pathogens in mediating the strength of sexual selection, and the role that parental care plays in successful reproduction. The Evolution of Insect Mating Systems is suitable for both graduate students and researchers interested in insect mating systems or behaviour from an evolutionary, genetical, physiological, or ecological perspective. Due to its interdisciplinary and concept-driven approach, it will also be of relevance and use to a broad audience of evolutionary biologists.

Insects display a staggering diversity of mating and social behaviours. Studying these systems provides insights into a wide range of evolutionary and behavioural questions, such as the evolution of sex, sexual selection, sexual conflict, and parental care. This edited volume provides an authoritative update of the landmark book in the field, The Evolution of Insect Mating Systems (Thornhill and Alcock, 1983), which had such a huge impact in shaping adaptationist approaches to the study of animal behaviour and influencing the study of the evolution of reproductive behaviour far beyond the taxonomic remit of insects. This accessible new volume brings the empirical and conceptual scope of the original book fully up to date, incorporating the wealth of new knowledge and research of the last 30 years. It explores the evolution of complex forms of sex determination in insects, and the role of sexual selection in shaping the evolution of mating systems. Selection arising via male contest competition and female choice (both before and after copulation) are discussed, as are the roles of parasites and pathogens in mediating the strength of sexual selection, and the role that parental care plays in successful reproduction. The Evolution of Insect Mating Systems is suitable for both graduate students and researchers interested in insect mating systems or behaviour from an evolutionary, genetical, physiological, or ecological perspective. Due to its interdisciplinary and concept-driven approach, it will also be of relevance and use to a broad audience of evolutionary biologists.

Beach-spawning fishes from exotic locations on most continents of the world provide spectacular examples of extreme adaptations during the most vulnerable life cycle stages. The beauty, intriguing biology, and importance of these charismatic fishes at the interface of marine and terrestrial ecosystems have inspired numerous scientific studies. Adaptations of behavior, physiology, development, and ecology are gathered together for the first time in this book. Beach-Spawning Fishes: Reproduction in an Endangered Ecosystem is a comprehensive guide to beach spawning, a charismatic animal behavior that is seen in a surprising number of teleost species. This unexpected form of reproduction provides a window into the ecology of coastal areas, the behaviors and physiology necessary for fishes and their eggs to adapt to terrestrial conditions, and the threats and challenges for conservation and management. Beach-spawning species include important forage fishes such as the capelin, exotic fishes such as the fugu puffer, and the spectacular midnight runs of the California grunion.