Sexual Segregation in Vertebrates

Sexual Segregation in Vertebrates PDF

Author: Kathreen Ruckstuhl

Publisher: Cambridge University Press

Published: 2006-01-05

Total Pages: 512

ISBN-13: 1107320631

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Males and females often differ in developmental patterns, adult morphology, ecology and behaviour, and in many mammals males are often larger. Size dimorphism results in divergent nutritional and energetic requirements or reproductive strategies by the sexes, which in turn sometimes causes them to select different forage, use different habitats, and express differing social affinities. Such divergent life-styles often lead males and females to live large parts of their lives separately. Sexual segregation is widespread in animals. Males and females may share the same habitat, but at different times, for example, or they might use different habitats entirely. Why did sexual segregation evolve and what factors contribute to it? Sexual Segregation in Vertebrates explores these questions by looking at a wide range of vertebrates and is aimed as a synthesis of our current understanding and a guide for future research.

Choosing Sexes

Choosing Sexes PDF

Author: Kristen J. Navara

Publisher: Springer

Published: 2018-02-01

Total Pages: 240

ISBN-13: 3319712713

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There is extensive evidence that vertebrates of all classes have the ability to control the sexes of the offspring they produce. Despite dramatic differences in the mechanisms by which different taxa determine the initial sex of offspring, each group has found its own way of adjusting offspring sex ratios in response to social and environmental cues. For example, stress is a well-known modulator of offspring sex in members of all groups studied to date. Food availability, and limitation in particular, is another common cue that stimulates biases in offspring sex ratios in a wide variety of species. Offspring sex can be adjusted at the primary level, which occurs prior to conception, or at the secondary level, during embryonic development. While the mechanistic pathways that ultimately result in sex ratio biases and the developmental time-points sensitive to those mechanisms likely differ among taxa, the key involvement of steroid hormones in the process of sex ratio adjustment appears to be pervasive throughout. This book reviews the systems of sex determination at play in different vertebrate groups, summarizes the evidence that members of all vertebrate taxa can facultatively adjust offspring sex, and discusses when and how these adjustments can take place.

Sexual Segregation in Ungulates

Sexual Segregation in Ungulates PDF

Author: R. Terry Bowyer

Publisher: JHU Press

Published: 2022-11-15

Total Pages: 201

ISBN-13: 1421445077

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Why does it benefit some male and female animals to live separately? Sexual segregation, wherein the sexes of a species live apart for long periods of time, has far-reaching consequences for the ecology, behavior, and conservation of hooved mammals, which are called ungulates. Award-winning researcher R. Terry Bowyer has spent the past four decades unravelling the causes and consequences of this perplexing phenomenon by studying ungulates and the large carnivores that prey upon them. In Sexual Segregation in Ungulates, Bowyer's critical, thought-provoking approach helps resolve long-standing disagreements concerning sexual segregation and offers future pathways for species and habitat conservation. He highlights important elements of the natural history of wild ungulate species, including bighorn sheep and elk. He then uses this perspective to frame and test hypotheses illuminating the motivations behind sexual segregation. He investigates the role of sexual segregation in mechanisms underpinning ungulate mating systems, sexual dimorphism, paternal behavior, and population dynamics. Bowyer's research spans ecosystems from deserts to the Arctic and involves most species of ungulates inhabiting the North American continent. He also provides a timely review of sexual segregation for species of plants and other animals, including humans. Covering definitions, theory, findings, and practical applications of related study, Bowyer describes the behavioral patterns related to sexual segregation, explains how to detect these patterns, and considers the implications of sexual segregation for new approaches to conservation and management of ungulates and other species of wildlife. This book is essential reading for scientists and all those interested in the conservation and management of species, including wildlife professionals, hunters, outdoor enthusiasts, and naturalists.

Ecology, Evolution and Behaviour of Wild Cattle

Ecology, Evolution and Behaviour of Wild Cattle PDF

Author: Mario Melletti

Publisher:

Published: 2014-10-30

Total Pages: 479

ISBN-13: 110703664X

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A beautifully illustrated reference work on the biology, ecology, conservation status and management of all thirteen species of wild cattle and buffalo. This book will be a valuable resource for students, researchers, and professionals in animal behaviour, behavioural ecology, evolutionary biology and conservation biology.

The Biology of Reproduction

The Biology of Reproduction PDF

Author: Giuseppe Fusco

Publisher: Cambridge University Press

Published: 2019-10-10

Total Pages: 491

ISBN-13: 1108499856

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A look into the phenomena of sex and reproduction in all organisms, taking an innovative, unified and comprehensive approach.

The Evolution of Beauty

The Evolution of Beauty PDF

Author: Richard O. Prum

Publisher: Anchor

Published: 2017-05-09

Total Pages: 448

ISBN-13: 0385537220

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A FINALIST FOR THE PULITZER PRIZE NAMED A BEST BOOK OF THE YEAR BY THE NEW YORK TIMES BOOK REVIEW, SMITHSONIAN, AND WALL STREET JOURNAL A major reimagining of how evolutionary forces work, revealing how mating preferences—what Darwin termed "the taste for the beautiful"—create the extraordinary range of ornament in the animal world. In the great halls of science, dogma holds that Darwin's theory of natural selection explains every branch on the tree of life: which species thrive, which wither away to extinction, and what features each evolves. But can adaptation by natural selection really account for everything we see in nature? Yale University ornithologist Richard Prum—reviving Darwin's own views—thinks not. Deep in tropical jungles around the world are birds with a dizzying array of appearances and mating displays: Club-winged Manakins who sing with their wings, Great Argus Pheasants who dazzle prospective mates with a four-foot-wide cone of feathers covered in golden 3D spheres, Red-capped Manakins who moonwalk. In thirty years of fieldwork, Prum has seen numerous display traits that seem disconnected from, if not outright contrary to, selection for individual survival. To explain this, he dusts off Darwin's long-neglected theory of sexual selection in which the act of choosing a mate for purely aesthetic reasons—for the mere pleasure of it—is an independent engine of evolutionary change. Mate choice can drive ornamental traits from the constraints of adaptive evolution, allowing them to grow ever more elaborate. It also sets the stakes for sexual conflict, in which the sexual autonomy of the female evolves in response to male sexual control. Most crucially, this framework provides important insights into the evolution of human sexuality, particularly the ways in which female preferences have changed male bodies, and even maleness itself, through evolutionary time. The Evolution of Beauty presents a unique scientific vision for how nature's splendor contributes to a more complete understanding of evolution and of ourselves.

Sexual Reproduction in Animals and Plants

Sexual Reproduction in Animals and Plants PDF

Author: Hitoshi Sawada

Publisher: Springer

Published: 2014-02-07

Total Pages: 463

ISBN-13: 4431545891

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This book contains the proceedings of the International Symposium on the Mechanisms of Sexual Reproduction in Animals and Plants, where many plant and animal reproductive biologists gathered to discuss their recent progress in investigating the shared mechanisms and factors involved in sexual reproduction. This now is the first book that reviews recent progress in almost all fields of plant and animal fertilization. It was recently reported that the self-sterile mechanism of a hermaphroditic marine invertebrate (ascidian) is very similar to the self-incompatibility system in flowering plants. It was also found that a male factor expressed in the sperm cells of flowering plants is involved in gamete fusion not only of plants but also of animals and parasites. These discoveries have led to the consideration that the core mechanisms or factors involved in sexual reproduction may be shared by animals, plants and unicellular organisms. This valuable book is highly useful for reproductive biologists as well as for biological scientists outside this field in understanding the current progress of reproductive biology.

Sex, Size and Gender Roles

Sex, Size and Gender Roles PDF

Author: Daphne J. Fairbairn

Publisher: OUP Oxford

Published: 2008-11-06

Total Pages: 280

ISBN-13: 0199545588

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This collection of 20 chapters written by leading evolutionary biologists from around the globe provides a fascinating insight into the patterns and causes of differences between males and females in the natural world.

Wildlife of the Tibetan Steppe

Wildlife of the Tibetan Steppe PDF

Author: George B. Schaller

Publisher: University of Chicago Press

Published: 2000-05

Total Pages: 392

ISBN-13: 9780226736532

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The Chang Tang, the vast, remote Tibetan steppe, is one of the most forbidding places on earth. Yet this harsh land is home to a unique assemblage of large mammals, including Tibetan antelope, gazelle, argali sheep, wild ass, wild yak, wolves, snow leopards, and others. Since 1985, George B. Schaller and his Chinese and Tibetan co-workers have surveyed the flora and fauna of the Chang Tang. Their research provides the first detailed look at the natural history of one of the world's least known ecosystems.