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Books > Science & Mathematics > Biology, life sciences > Zoology & animal sciences > General

The Social Lives of Animals - How Co-operation Conquered the Natural World (Hardcover, Main): Ashley Ward The Social Lives of Animals - How Co-operation Conquered the Natural World (Hardcover, Main)
Ashley Ward
R506 Discovery Miles 5 060 Ships in 12 - 17 working days

'Any writer who can evoke the existential sadness of a lonely cockroach, or make krill thrilling, or describe a snorkelling colleague being engulfed in a "gargantuan cetacean bum detonation" is a real gift to science communication ... thought-provoking' Guardian Everything you ever wanted to know about how animals live together, and what that means for us Some animal societies hold a mirror up to the human world: elephants hold funerals for departed family members. Pinyon jays run collective creches. Rats will go out of their way to help a cold, wet stranger. Other lifestyles can seem intensely alien. Take locusts, surging over the land in their millions, unable to slow down for a moment because the hungry ranks behind will literally bite their legs off if they don't stay one step ahead (actually, you might know a few people like that). But no matter how offputting an animal might be, behavioural scientist Ashley Ward can usually find something worth celebrating. Travelling the world from the Serengeti to the frozen Antarctic ocean, with stops in the muddy fields and streams of his native northern Yorkshire, he brings his curious eye and infectious humour right down to their level. The result is a world-expanding, myth-busting tour of some of nature's greatest marvels, in delightfully broad-minded company.

Bats - In a World of Echoes (Hardcover, 1st ed. 2017): Johan Ekloef, Jens Rydell Bats - In a World of Echoes (Hardcover, 1st ed. 2017)
Johan Ekloef, Jens Rydell
R1,440 R1,146 Discovery Miles 11 460 Save R294 (20%) Ships in 10 - 15 working days

This comprehensive book about the lives of bats is about a group of peculiar, mythical and fascinating animals. They are mammals, just like us, but still so different. The book covers bats from Latin American Maya temples to Swedish potato cellars; from the plains of Kenya to the Taiwanese mountains. We perceive their shadows flitting by in the summer nights, hear their mating calls in the darkness of autumn and see their silhouettes in the dim street light. The bats live in our houses and forage in our gardens and parks. But who are they and how do they lead their lives? The text and exquisite photos give an unsurpassed insight into the world of sounds and smells that bats encounter each night. We are told about how their senses, way beyond our human perception abilities, shape their lives. We get to know more about their habits, their long evolution and their cohabitation with humans, and how important they are to the environment. You will never again feel lonely in the darkness of the night.

Animal Behavior - Concepts, Methods, and Applications (Paperback, 3rd Revised edition): Shawn E. Nordell, Thomas J Valone Animal Behavior - Concepts, Methods, and Applications (Paperback, 3rd Revised edition)
Shawn E. Nordell, Thomas J Valone
R3,881 Discovery Miles 38 810 Ships in 9 - 15 working days

EMPHASIZES CONCEPTS. Animal Behavior: Concepts, Methods, and Applications, Third Edition, uses broad organizing concepts to provide a framework for understanding the science of animal behavior. In an engaging, question-driven style, Shawn E. Nordell and Thomas J. Valone offer readers a clear learning progression for understanding and evaluating empirical research examples. FOCUSES ON METHODOLOGY AND THE PROCESS OF SCIENCE. Featured studies illustrate each concept and emphasize the experimental designs and the hypothesis testing methods scientists use to address research questions. HIGHLIGHTS REAL-WORLD APPLICATIONS. Concepts are related to real life to help students understand the broader significance of animal behavior research, including applications to human behavior and conservation.

Dinosaurs - A Concise Natural History (Paperback, 4th Revised edition): David E. Fastovsky, David B. Weishampel Dinosaurs - A Concise Natural History (Paperback, 4th Revised edition)
David E. Fastovsky, David B. Weishampel; Illustrated by John Sibbick
R1,620 Discovery Miles 16 200 Ships in 9 - 15 working days

The ideal textbook for non-science majors, this lively and engaging introduction encourages students to ask questions, assess data critically and think like a scientist. Building on the success of previous editions, Dinosaurs has been thoroughly updated to include new discoveries in the field, such as the toothed bird specimens found in China and recent discoveries of dinosaur soft anatomy. Illustrations by leading paleontological illustrator John Sibbick and new, carefully-chosen photographs, clearly show how dinosaurs looked, lived and their role in Earth history. Making science accessible and relevant through clear explanations and extensive illustrations, the text guides students through the dinosaur groups, emphasizing scientific concepts rather than presenting endless facts. Grounded in the common language of modern evolutionary biology - phylogenetic systematics - students learn to think about dinosaurs the way that professional paleontologists do.

The Rescued Puppy (Standard format, CD, Unabridged edition): Holly Webb The Rescued Puppy (Standard format, CD, Unabridged edition)
Holly Webb; Read by Phyllida Nash
R268 Discovery Miles 2 680 Ships in 12 - 17 working days
Animal Vegetable Criminal - When Nature Breaks the Law (Paperback): Mary Roach Animal Vegetable Criminal - When Nature Breaks the Law (Paperback)
Mary Roach
R310 R253 Discovery Miles 2 530 Save R57 (18%) Ships in 9 - 15 working days

AN AMAZON BEST BOOK OF 2021 'Delightful' Ed Yong What's to be done about a drunken elephant? A monkey caught mugging passers-by? A trespassing squirrel? Follow Mary Roach as she investigates laser scarecrows, robo-hawks, human-elephant conflict specialists and monkey impersonators. Travel to the bear-busy back alleys of Aspen, the gull-vandalized floral displays at the Vatican and leopard-terrorized hamlets in the Himalayas. In this fresh, funny and thoroughly researched book, dive into the weird and wonderful moments when humanity and wildlife bump up against one another.

Aristotle and the Animals - The Logos of Life Itself (Hardcover): Claudia Zatta Aristotle and the Animals - The Logos of Life Itself (Hardcover)
Claudia Zatta
R3,990 Discovery Miles 39 900 Ships in 9 - 15 working days

With a novel approach to Aristotle's zoology, this study looks at animals as creatures of nature (physis) and reveals a scientific discourse that, in response to his predecessors, exiles logos as reason and pursues the logos intrinsic to animals' bodies, empowering them to sense the world and live. The volume explores Aristotle's conception of animals through a discussion of his ad hoc methodology to study them, including the pertinence of the soul to such a study, and the rise of zoology as a branch of natural philosophy. For Aristotle, animal life stems from the body in the space of existence and revolves around sensation, which is entwined with pleasure, pain, and desire. Lack of human reason is irrelevant to an understanding of the richness of animal life and cognition. In sum, the reader will acquire knowledge of the "animal as such," which lay at the core of Aristotle's agenda and required a study of its own, separate from plants and the elements. This book is intended for students of the history of science, ancient biology, and philosophy and all those who, from different fields, are interested in animal studies and the human-animal relation.

Distillers Grains - Production, Properties, and Utilization (Hardcover): KeShun Liu, Kurt A. Rosentrater Distillers Grains - Production, Properties, and Utilization (Hardcover)
KeShun Liu, Kurt A. Rosentrater
R5,285 Discovery Miles 52 850 Ships in 12 - 17 working days

In recent years, there has been a dramatic increase in grain-based fuel ethanol production in North America and around the world. Whether such production will result in a net energy gain or whether this is sustainable in the long term is under debate, but undoubtedly millions of tons of non-fermented residues are now produced annually for global trade in the form of distillers dried grains with solubles (DDGS). Consequently, in a short period of time a tremendous amount of research has been conducted to determine the suitability of ethanol coproducts for various end uses. Distillers Grains: Production, Properties and Utilization is the first book of its kind to provide in-depth, and up-to-date coverage of Historical and current status of the fuel ethanol industry in the U.S. Processing methods, scientific principles, and innovations for making fuel ethanol using grains as feedstock Physical and chemical properties of DDGS, assay methodologies for compositional analyses, and mycotoxin occurrence in DDGS Changes during processing (from grains to DDGS) and analysis of factors causing variations in compositional, nutritional, and physical values Various traditional, new, and emerging uses for DDGS (including feed for cattle, swine, poultry, fish, and other animals, feedstocks for cellulosic ethanol, biodiesel, and other bioenergy production, and substrates for food and industrial uses) Appealing to all who have an interest in fuel ethanol production, distillers grains, and their uses, this comprehensive reference sharpens the readers' understanding of distillers grains and will promote better utilization of ethanol coproducts. Animal and food scientists, feed and food technologists, ethanol plant managers and technicians, nutritionists, academic and governmental professionals, and college students will find the book most useful.

Exotic Vetting - Extraordinary Stories of Treating Amazing Animals (Paperback): Romain Pizzi Exotic Vetting - Extraordinary Stories of Treating Amazing Animals (Paperback)
Romain Pizzi
R234 Discovery Miles 2 340 Ships in 12 - 17 working days

Anaesthetising a fish, x-raying a frog and hospitalising a walrus are all in a day’s work for the world’s wildest veterinarian. Travelling from the rainforests of Sierra Leone to the jungles of Borneo, Romain Pizzi has caught, anaesthetised, diagnosed, operated on, medicated, and then released some of the world's most endangered wild animals. From disease testing Polynesian snails to keyhole surgery in Sumatran orangutans; from endoscopy in sharks to ultrasound on a chimpanzee. Sometimes this is high tech work, such as the first robotic surgery in a tiger, or giant panda cloning attempts. Sometimes the situations are more primitive, from anaesthetising a bear with a bicycle pump, old plumbing tubes and a plank, to operating on a vulture using an old metal spoon. In Exotic Vetting, Romain recalls his many interesting patients, while taking readers on a tour of the challenges of treating the world’s amazing spectrum of wild animal species.

Biological Systematics - History and Theory (Paperback): Igor Pavlinov Biological Systematics - History and Theory (Paperback)
Igor Pavlinov
R1,250 Discovery Miles 12 500 Ships in 9 - 15 working days

This volume reviews the historical roots and theoretical foundations of biological systematics in an approachable text. The author outlines the structure and main tasks of systematics. Conceptual history is characterized as a succession of scientific revolutions. The philosophical foundations of systematic research are briefly reviewed as well as the structure and content of taxonomic theories. Most important research programs in systematics are outlined. The book includes analysis of the principal problematic issues as "scientific puzzles" in systematics. This volume is intended for professional taxonomists, biologists of various specialties, students, as well as all those interested in the history and theory of biology and natural sciences. Key Features Considers the conceptual history of systematics as the framework of evolutionary epistemology Builds a hierarchically organized quasi-axiomatic system of taxonomic theory Contends that more reductionist taxonomic concepts are less objective Supports taxonomic pluralism by non-classic philosophy of science as a normal condition of systematics Documents that "taxonomic puzzles" result from conflict between monistic and pluralistic attitudes Related Titles de Queiroz, K. et al., eds. Phylonyms: A Companion to the PhyloCode (ISBN 978-1-1383-3293-5) Sigwart, J. D. What Species Mean: A User's Guide to the Units of Biodiversity (ISBN 978-1-4987-9937-9) Rieppel, O. Phylogenetic Systematics: Haeckel to Hennig (ISBN 978-1-4987-5488-0) Wilkins, J. S. Species: The Evolution of the Idea, 2nd ed. (ISBN 978-1-1380-5574-2)

From the Seashore to the Seafloor - An Illustrated Tour of Sandy Beaches, Kelp Forests, Coral Reefs, and Life in the... From the Seashore to the Seafloor - An Illustrated Tour of Sandy Beaches, Kelp Forests, Coral Reefs, and Life in the Ocean's Depths (Hardcover)
Janet Voight; Illustrated by Peggy Macnamara; Foreword by David Quammen
R674 R565 Discovery Miles 5 650 Save R109 (16%) Ships in 10 - 15 working days

An octopus expert and celebrated artist offer a deep dive to meet the enchanting inhabitants of the world's marine ecosystems. Have you ever walked along the beach and wondered what kind of creatures can be found beneath the waves? Have you pictured what it would be like to see the ocean not from the shore, but from its depths? These questions drive Janet Voight, an expert on mollusks who has explored the seas in the submersible Alivn that can dive some 14,000 feet below the water's surface. In this book, she partners with artist Peggy Macnamara to invite readers to share her undersea journeys of discovery. With accessible scientific description, Voight introduces the animals that inhabit rocky and sandy shores, explains the fragility of coral reefs, and honors the extraordinary creatures that must search for food in the ocean's depths, where light and heat are rare. These fascinating insights are accompanied by Macnamara's stunning watercolors, illuminating these ecosystems and other scenes from Voight's research. Together, they show connections between life at every depth-and warn of the threats these beguiling places and their eccentric denizens face.

Placing Animals in the Neolithic - Social Zooarchaeology of Prehistoric Farming Communities (Hardcover): Arkadiusz Marciniak Placing Animals in the Neolithic - Social Zooarchaeology of Prehistoric Farming Communities (Hardcover)
Arkadiusz Marciniak
R4,367 Discovery Miles 43 670 Ships in 12 - 17 working days

This book presents a new perspective on the social milieu of the Early and Middle Neolithic in Central Europe as viewed through relations between humans and animals, food acquisition and consumption, as well as refuse disposal practices. Based on animal bone assemblages from a wide range of sites from a period of over 2,000 years originating in both the North European Plain lowlands and the loess uplands, the evidence explored in the book represents the Linear Band Pottery Culture (LBK), the Lengyel Culture, and the Funnel Beaker Culture (TRB) allowing us to follow the dynamic development of early farmers from their emergence in the area north of the Carpathians up to their consolidation and stabilization in this new territory.

Species - The Evolution of the Idea, Second Edition (Paperback): John S. Wilkins Species - The Evolution of the Idea, Second Edition (Paperback)
John S. Wilkins
R1,542 Discovery Miles 15 420 Ships in 9 - 15 working days

Over time the complex idea of "species" has evolved, yet its meaning is far from resolved. This comprehensive work is a fresh look at an idea central to the field of biology by tracing its history from antiquity to today. Species is a benchmark exploration and clarification of a concept fundamental to the past, present, and future of the natural sciences. In this edition, a section is added on the debate over species since the time of the New Synthesis, and brings the book up to date. A section on recent philosophical debates over species has also been added. This edition is better suited non-specialists in philosophy, so that it will be of greater use for scientists wishing to understand how the notion came to be that living organisms form species. Key Selling Features: Covers the philosophical and historical development of the concept of "species" Documents that variation was recognized by pre-Darwinian scholars Includes a section on the debates since the time of the New Synthesis Better suited to non-philosophers

Revolutionary Biology - The New, Gene-centered View of Life (Paperback, New edition): David Barash Revolutionary Biology - The New, Gene-centered View of Life (Paperback, New edition)
David Barash
R1,407 Discovery Miles 14 070 Ships in 12 - 17 working days

There is a revolution underway in biology. It is based on a new perception of bodies and genes, in which the former are the end product of the latter within the continuum of evolution. Twenty five years after Richard Dawkins helped revolutionize our thinking about "selfish genes," it is time to re-evaluate. "Revolutionary Biology" explains in simple, vivid terms what this exciting approach has to offer, and then applies its stunning insights to human beings. This novel perspective, galvanizes our understanding of how evolution works, what living things are all about and, not least what it means to be human. The controversial disciplines of sociobiology and evolutionary psychology have generated startling insights into longstanding questions concerning the nature and purpose of families, altruism vs. selfishness, and free will vs. biological determinism. Written by one of its foremost figures, "Revolutionary Biology" is a manifesto and educated layman's guide to this ongoing revolution.

Barash's purpose is to demystify the basic concepts of the genetic revolution and take the reader on a tour--accessible and authoritative--of the principles that underlie this fascinating turn in scientific thought. Much has been written about evolution, animals, and the animal and evolutionary origins of human behavior, yet only recently have biologists begun to appreciate these connections. The key concept is that genes--not species, not groups, and not even individuals--are the apple of evolution's eye. The result has been a major biological paradigm shift that is making itself felt in the social sciences as well. Barash explores the phenomenon of altruism both at the animal level, and the human level.

Barash draws not only on a wealth of biological evidence but on literature, philosophy, and the familiar details of everyday life to communicate the essentials of this increasingly influential approach to the study of the human species. Clearly and engagingly written, "Revolutionary Biology" will be fascinating reading for those seeking an entry into this new science.

Xenopus - From Basic Biology to Disease Models in the Genomic Era (Paperback): Abraham Fainsod, Sally A. Moody Xenopus - From Basic Biology to Disease Models in the Genomic Era (Paperback)
Abraham Fainsod, Sally A. Moody
R2,555 Discovery Miles 25 550 Ships in 9 - 15 working days

Provides historical context for the many contributions made by using the Xenopus model System. Chapters written by an international team of leading researchers using Xenopus as a model organism. Chapters deal with cell biology, developmental biology, genomics, and evolutionary biology and include the results of the research. Well illustrated with color diagrams and photos.

Human Behavior in the Social Environment from an African American Perspective (Paperback): Letha A. See Human Behavior in the Social Environment from an African American Perspective (Paperback)
Letha A. See
R1,403 R845 Discovery Miles 8 450 Save R558 (40%) Ships in 12 - 17 working days

In Human Behavior in the Social Environment from an African American Perspective, leading black scholars come together to discuss complex human behavior problems faced by African Americans and to force the abandonment of conceptualization theories made without consideration of the Black experience. Challenging you to engage in different thinking and develop new theories for addressing the needs of African Americans, this book highlights the assets of black individuals, families, and communities and guides you through program interventions and public policies that strengthen and empower African Americans. You will learn to enhance your clients'coping strategies and resilience by factoring in their strengths rather than focusing on their weaknesses.Human Behavior in the Social Environment from an African American Perspective contextualizes community behavior patterns, gender roles, and changing contemporary identities to challenge your assumptions about African American culture and communities and convince you to rethink your intervention strategies and methods. To further help you fine-tune your service delivery, this book leads you through discussions on: help-seeking behaviors of young street males the association of sociocultural risk factors with suicides the use of emotive behavior therapy to help African Americans cope with the prospect of imminent death advocating for changes in institutions and systems which negatively impact the lives of the poor and the oppressed how social work has ignored one segment of the African American community--young girls in urban settings psychological consequences of coming of age in a hostile environmentSocial workers, community-based groups, policymakers, and other helping professionals owe it to their clients to shrug off culturally incompetent services and care. Using Human Behavior in the Social Environment from an African American Perspective as a guide, you will learn to redress your programs and policies with a sensitivity to the factors and mechanisms that maximize the buoyancy of disadvantaged groups over various stages of their life development.

Italian Opera Since 1945 (Paperback): Raymond Fearn Italian Opera Since 1945 (Paperback)
Raymond Fearn
R1,859 Discovery Miles 18 590 Ships in 12 - 17 working days

Italy, the birthplace of opera in the late sixteenth century, has in recent decades seen remarkable and vital musical growth, with composers as diverse as Luciano Berio and Nino Rota, Luigi Nono and Sylvano Bussotti, Giacomo Manzoni, Bruno Maderna and Salvatore Sciarrino. The musical theatre has figured prominently in the work of Italian composers during this period, ranging from operas conceived in a traditional mode to works of a Music Theatre variety, and in style from popular to avant-garde.
In this book Raymond Fearn surveys this Italian musico-theatrical phenomenon in the period since the Second World War, examining a wide range of works such as Nono's "Intolleranza" and "Al Gran Sole Carico d'Amore," Berio's "Passaggio" and "Un re in ascolto," Manzoni's "Atomtod" and "La Sentenza" and Castiglioni's "Oberon and The King's" "Masque," and places these developments within a cultural and theatrical context. Illustrated by numerous musical examples and producti

Visual Navigation - From Biological Systems To Unmanned Ground Vehicles (Hardcover): Yiannis Aloimonos Visual Navigation - From Biological Systems To Unmanned Ground Vehicles (Hardcover)
Yiannis Aloimonos
R3,094 R2,774 Discovery Miles 27 740 Save R320 (10%) Ships in 12 - 17 working days

All biological systems with vision move about their environments and successfully perform many tasks. The same capabilities are needed in the world of robots. To that end, recent results in empirical fields that study insects and primates, as well as in theoretical and applied disciplines that design robots, have uncovered a number of the principles of navigation. To offer a unifying approach to the situation, this book brings together ideas from zoology, psychology, neurobiology, mathematics, geometry, computer science, and engineering. It contains theoretical developments that will be essential in future research on the topic -- especially new representations of space with less complexity than Euclidean representations possess. These representations allow biological and artificial systems to compute from images in order to successfully deal with their environments.
In this book, the barriers between different disciplines have been smoothed and the workings of vision systems of biological organisms are made clear in computational terms to computer scientists and engineers. At the same time, fundamental principles arising from computational considerations are made clear both to empirical scientists and engineers. Empiricists can generate a number of hypotheses that they could then study through various experiments. Engineers can gain insight for designing robotic systems that perceive aspects of their environment.
For the first time, readers will find:
* the insect vision system presented in a way that can be understood by computational scientists working in computer vision and engineering;
* three complete, working robotic navigation systems presented with all the issues related to their design analyzed in detail;
* the beginning of a computational theory of direct perception, as advocated by Gibson, presented in detail with applications for a variety of problems; and
* the idea that vision systems could compute space representations different from perfect metric descriptions -- and be used in robotic tasks -- advanced for both artificial and biological systems.

Animal Clinical Chemistry - A Practical Handbook for Toxicologists and Biomedical Researchers, Second Edition (Paperback, 2 Rev... Animal Clinical Chemistry - A Practical Handbook for Toxicologists and Biomedical Researchers, Second Edition (Paperback, 2 Rev Ed)
G. O. Evans
R2,045 R1,646 Discovery Miles 16 460 Save R399 (20%) Ships in 12 - 17 working days

By presenting background information on the selection and application of biochemical tests in safety assessment studies, this text seeks to provide a basis for improving the knowledge required to interpret data from toxicological studies. In addition to chapters which discuss the assessment of specific organ toxicity (such as the liver, kidney and thyroid), the book also covers pre-analytical variables, regulatory requirements and statistical approaches, and highlights some of the major differences between man and different laboratory animals. The editor and contributor are all members of the Animal Clinical Chemistry Association, a group formed to advance the science of animal clinical chemistry in safety evaluation, toxicology and veterinary science.

FCS Animal production: Level 2 (Paperback): Patricia Botes, Albert Mazibuko, Gerhardus Viljoen FCS Animal production: Level 2 (Paperback)
Patricia Botes, Albert Mazibuko, Gerhardus Viljoen
R474 R418 Discovery Miles 4 180 Save R56 (12%) Ships in 5 - 10 working days

The series is designed to meet the needs of students and lecturers of the National Certificate Vocational. To facilitate students' learning, the following features are used in the series: Content is written in easy-to-understand language, key terms are carefully explained, using everyday English, case studies show how to apply the theory in the work environment, the study skills sections help students make the most of their learning in class and prepare for the exams, there are many practice activities and questions with model answers at the back of the title, checklists assist students to make sure that they have covered all the skills and content in each chapter, and summaries at the end of each chapter are useful for exam revision. Lecturers using the series can teach with confidence because content is comprehensive, up-to-date, and meets all the curriculum requirements for the subject, outcomes and assessment standards are clearly identified, and assessment tasks and activities are aligned to the outcomes and assessment standards. Prescribing lecturers have access to comprehensive lecturer support material on CD including model answers to assessments in the textbook, additional assessments with model answers, rubrics for assessments, and general reference material on teaching outcomes-based education. The series is available for all programmes, all fundamental and compulsory subjects, and all elective and optional subjects.

The Works of Charles Darwin (SET) (Hardcover): Paul H. Barrett The Works of Charles Darwin (SET) (Hardcover)
Paul H. Barrett
R61,667 Discovery Miles 616 670 Ships in 12 - 17 working days

A 29-volume set which contains all Charles Darwin's published works. Darwin was one of the most influential figures of the 19th century. His work remains a central subject of study in the history of ideas, the history of science, zoology, botany, geology and evolution.

The Works of Charles Darwin: v. 21-29 (Hardcover): Paul H. Barrett The Works of Charles Darwin: v. 21-29 (Hardcover)
Paul H. Barrett
R19,887 Discovery Miles 198 870 Ships in 12 - 17 working days

Volumes 21 to 29 in a 29-volume set which contain all Charles Darwin's published works. Darwin was one of the most influential figures of the 19th century whose work remains a central subject of study in the history of ideas, the history of science, zoology, botany, geology and evolution.

Evolution and Speciation in Protozoa (Hardcover): T. J Pandian Evolution and Speciation in Protozoa (Hardcover)
T. J Pandian
R3,750 Discovery Miles 37 500 Ships in 12 - 17 working days

The polyphyletic Protozoa have explored the possibility of performing almost all metazoan functions with a few subcellular organelles. Their unicellularity and structural simplicity have (i) limited diversity to 32,950 species, (ii) restricted spatial distribution to aquatic habitats (94%, against 15% in Metazoa), (iii) demonstrated the ubiquitous dominance of clonality, (iv) reduced sexualization in 50% species, (v) facilitated the use of vegetative gametes in 40% species and (vi) secondary loss of sex in 10% species. With the fastest multiplication rates, i.e. once every 6-60 hours, they occur in high densities of 105-106 cell/ml. Their diverse and complicated life cycles are described in 30 types. Being risky, the cycle involves two hosts in < 2,000 parasitic species and injective transmission mode by sanguivorous insects and ticks in < 300 species. Their radial symmetry has accelerated diversity more than in radially symmetric less speciose Porifera (8,553 species), Cnidaria (10,856) and Echinodermata (7,000). In them, diversity is decelerated in the following descending order: symmetry > clonality > hermaphroditism > motility. Motility ranges from 2-3 m for Rhizopoda to 400-2,000 m for Ciliophora. Not surprisingly, 6,800 species of arcellinids, filosians and formainifers are testated or shelled. Within 1,229 sessile species, the peritrichid and suctorian ciliates are better adapted to coloniality. Unlike those of many Metazoa, the protozoan cyst is a dynamic stage, in which clonal or sexual reproduction occurs. Over 81% protozoans encyst, as it ensures (i) 90% survival during unfavorable conditions (against 15 in 12% non-encysted protozoans), (ii) genome transfer through generations, (iii) dispersal into new habitats and (iv) transmission to new hosts. Their mean body size ranges from 2 m to 2 mm - a range over 1,000-times - only 8% aquatic metazoans cover a similar size range. In comparison to 77% macrophagy in Metazoa, only 46% protozoans are macrophagous predators. Within motile microphagy, protozoans filter 3-2 times smaller food particle at 50% cheaper clearance cost. This efficiency has expanded microphagy to 15% in protozoans, against 3% in Metazoa. Hence, their turnover rate in trophic dynamics is twice faster than that of metazoans. Foraminifers serve as ecological sensitive indicators in petroleum exploration and rise in sea level. For the first time, incidences of clonality and meiosis as well as symbiosis and parasitism have been shown to hint at the origin and evolution of different protozoan taxonomic groups during the geological past.

The Works of Charles Darwin: v. 11-20 (Hardcover): Paul H. Barrett The Works of Charles Darwin: v. 11-20 (Hardcover)
Paul H. Barrett
R22,086 Discovery Miles 220 860 Ships in 12 - 17 working days

Volumes 11 to 20 in a 29-volume set which contain all Charles Darwin's published works. Darwin was one of the most influential figures of the 19th century whose work remains a central subject of study in the history of ideas, the history of science, zoology, botany, geology and evolution.

Guess Who's in the Desert (Hardcover): Charline Profiri Guess Who's in the Desert (Hardcover)
Charline Profiri; Illustrated by Susan Swan
R498 R420 Discovery Miles 4 200 Save R78 (16%) Ships in 10 - 15 working days

The desert is full of suprises You never know what you might find nestled in a tall saguaro or climbing steep canyon walls. All you have to do is look "Guess Who's in the Desert" is a fun, interactive, guessing game that invites curious children to discover all of the secrets and surprises the desert holds. Who leaves x-shaped tracks? Who has orange and black beady skin? Just open the book to find out. Each time you do, you're bound to find something new.

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