MAMMALS WHO MORPH

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Mammals Who Morph

Author : Jennifer Morgan
ISBN : 1584693002
Genre : JUVENILE NONFICTION
File Size : 21.5 MB
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Examines mammals morphed into lots of new earthlings. Explains the evolution of life on Earth, from the dinosaurs to the rise of modern humans, in the form of a letter written by the thirteen-billion-year-old universe itself to an Earthling.
Category: JUVENILE NONFICTION

Mammal Phylogeny

Author : Frederick S. Szalay
ISBN : 9781461392491
Genre : Science
File Size : 24.47 MB
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The roots of this book and its sister volume, Mammal Phylogeny: Placentals, go back to discussions and plans, shelved for a while, between F. S. Szalay and W. P. Luckett during the international and multidisciplinary symposium on rodent evolution sponsored by NATO, July 2-6, 1984, in Paris. That conference, orga nized by W. P. Luckett and J. -L. Hartenberger, the proceedings of which were published in 1985, proved an inspiring experience to all of the participants, as this was repeatedly expressed both during and after the meetings. In addition to issues relating to rodents, general theoretical topics pertaining to the evolutionary biol ogy and systematics of other groups of mammals regularly surfaced during the presentations and discussions. M. J. Novacek, who was also a participant in the rodent symposium, shared with Luckett and Szalay the enthusiasm acquired there, and he also expressed strong interest for a meeting on mammal evolution with a general focus similar to that of the rodent gathering. In 1988, Szalay and Luckett, after having planned in detail a program, direc tion, and core list of participants, were awarded a $30,000 grant by the Alfred P. Sloan Foundation through the Research Foundation of the City University of New York. The grant was contingent upon obtaining additional funds sufficient to assure that the symposium would be held. Raising the remaining funds proved to be a problem.
Category: Science

Evolutionary History Of The Marsupials And An Analysis Of Osteological Characters

Author : Frederick S. Szalay
ISBN : 0521441692
Genre : Science
File Size : 90.26 MB
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Examines a variety of problems in the understanding of the evolutionary history of the marsupials. In reviewing the evidence from bones, the author presents much new information on both living and fossil groups of marsupials. All groups of marsupials are treated in detail, and in the final chapter their history in space and time and their palaeobiogeography are considered.
Category: Science

Mammals As Predators

Author : N. Dunstone
ISBN : UCLA:L0063498398
Genre : Science
File Size : 56.63 MB
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This volume explores three major areas of research on predatory mammals: physiological adaptations, predatory tactics, and management dilemmas resulting from predation that upsets ecological balance or human activities. Contributors discuss the cases of many different types of animals, from otters and badgers to lions and leopards. The big cats, for example, are included in the context of studies of cattle mortality in Kenya and Venezuela and other countries. Other chapters discuss problems caused by fish-eating mammals near coastal Scotland, disease carrying birds, urban foxes, and many equally insightful cases. The book will interest all ecologists, zoologists, and conservationists concerned with issues relating to the predatory habits of wildlife around the world.
Category: Science

Insectivora

Author : Heinz Stephan
ISBN : 9781461391241
Genre : Medical
File Size : 25.18 MB
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This first volume in the series on "Comparative Brain Research in Mammals" deals with the brains of Insectivora. The importance of Insectivora lies above all in the fact that, (1) insectivore-like ancestors are regarded as the initial group for the evolution of higher mammals, and (2) the insectivore brains retained many conservative traits, though the animals have adapted to different living environments. Therefore, the study of Insectivora brains enables an insight into the size and composition of the brain structure of earlier ancestors of the higher mammals including primates and humans; in addition, it illumi nates the various evolutionary trends which made the successful adaptation to different biotopes possible. The alterations which the brain has experienced in the course of the phylo geny and the related adaptive radiation will be examined in the succeeding volumes on the brains of other Eutheria, e.g., bats (Volume 2) and primates (Volume 4). In Volume 3 the brains of marsupials will be compared with those of conservative and evolved Eutheria.
Category: Medical

Confessions From The Principal S Kid

Author : Robin Mellom
ISBN : 9781328698995
Genre : Juvenile Fiction
File Size : 68.88 MB
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During the school day, fifth-grader Allie West is an outsider. Everyone knows the principal's kid might tattle to her mom! But after school, Allie is an insider. She's friendly with the janitor, knows the shortest routes around the building, and hangs out with the Afters, a group of misfits whose parents are teachers at their school. Although Allie secretly loves her insider life, she's sick of being an outsider—so she vows to join the Pentagon, the popular math team led by her ex–best friend. But can Allie change her status without betraying where she really belongs?
Category: Juvenile Fiction

Development Of The Cetacean Nasal Skull

Author : Milan Klima
ISBN : 9783642586125
Genre : Science
File Size : 30.18 MB
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Morphogeny of the nasal skull was investigated in 92 embryos of 13 species of Cetacea. Compared to the original nasal capsule of land mammals, the nasal structures of Cetacea show many weighty transformations. As a result, the nostrils are translocated from the tip of the snout to the vertex of the head. Several structures of the embryonic nasal skull remain preserved even in adult cetaceans. The translocation of the nostrils to the highest point of the surfacing body is among the most perfect adaptations of cetaceans to the aquatic life habits. The morphogeny of the nasal skull suggests that all cetaceans are of common origin and form a single monophyletic order. The hitherto usual division of this order into two suborders, Mysticeti and Odontoceti, appears to be unsubstantiated. Rather, at least three closely related superfamilies should be distinguished within the order Cetacea, viz., Balaenopteroidea, Physeteroidea, and Delphinoidea. The results are in a
Category: Science

Ultrastructure Of The Digestive Tract

Author : P. Motta
ISBN : 9781461320715
Genre : Medical
File Size : 20.80 MB
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When established four years ago, the scope of this international series in electron microscopy essentially was to provide an opportunity for the pUblication of selected review contributions by specialists in ultrastructural research. Previous volumes presented over the last three years have focused on special topics of present interest in ~'ontemporary biomedicine such as endocrine cells, reproduction, and connective tissues. In these fielCls, in fact, integrated methods of electron microscopy have contributed much to generate new ideas and concepts of general value in both basic and clinical applications. The Ultrastructure of the Digestive Tract basically follows the same guidelines and style of the other books in the series and is an invited collection of selected contributions of authors from various laboratories active in the field of electron microscopy. Therefore, although the various chapters consist of individual topics, they nevertheless should be considered as interrelated contributions of specific subjects in the field. The idea was to have critical reviews of aspects previously published elsewhere by experts in the field who, as a rule, include other relevant information in their articles in order to update and enrich the subject. This book contains fifteen chapters by renowned electron microscopists. Each chapter, according to the policy of the editors, reviews a particular topic in great detail, providing updated information, study methods and results, authors' ideas on future investigative approaches, and possible guidelines for forthcoming work. We hope that this book will be useful to cell biologists, morphologists, physiologists, and pathologists.
Category: Medical

Birds Of Arizona

Author : Todd Telander
ISBN : 9780762785643
Genre : Nature
File Size : 31.55 MB
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Each Falcon Field Guide to birds introduces the 180 most common and sought-after species in a state. Conveniently sized to fit in your pocket and featuring full-color, detailed illustrations, these informative guides make it easy to identify birds in a backyard, favorite parks, and wildlife areas. Each bird is accompanied by a detailed listing of its prominent attributes and a color illustration showing its important features. Birds are organized in taxonomic order, keeping families of birds together for easy identification. This is the essential source for the field, both informative and beautiful to peruse.
Category: Nature

Sperm Competition In Humans

Author : Todd K. Shackelford
ISBN : 9780387280394
Genre : Science
File Size : 64.48 MB
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In species with internal fertilization, sperm competition occurs when the sperm of two or more males simultaneously occupy the reproductive tract of a female and compete to fertilize an egg (Parker, 1970). A large body of empirical research has demonstrated that, as predicted by sperm competition theory, males and females in many species possess anatomical, behavioral, and physiological adaptations that have evolved to deal with the adaptive challenges associated with sperm competition. Moreover, in recent years, evolutionary biologists and psychologists have begun to examine the extent to which sperm competition may have been an important selective pressure during human evolution. Some research has suggested that male humans, like males of many bird, insect, and rodent species, might be able to adjust the number of sperm they inseminate according to the risk of sperm competition. Other research has examined whether such responses might be accompanied by psychological changes that motivate human males to pursue copulations when the risk of sperm competition is high. Furthermore, there is research suggesting that aspects of human penile anatomy might function to enhance success in sperm competition. Much of this work has been controversial; some of the findings have been disputed and others have been greeted with skepticism. However, the idea that some aspects of human psychology and behavior might best be understood as adaptations to sperm competition remains intriguing and, in certain cases, very persuasive.
Category: Science