Whether you're a polar bear giving birth to cubs in an Arctic winter, a camel going days without water in the desert heat, or merely a suburbanite without air conditioning in a heat wave, your comfort and even survival depend on how well you adapt to extreme temperatures.
In this entertaining and illuminating book, biopsychologist Mark Blumberg explores the many ways that temperature rules the lives of all animals (including us). He moves from the physical principles that govern the flow of heat in and out of our bodies to the many complex evolutionary devices animals use to exploit those principles for their own benefit.
In the process Blumberg tells wonderful stories of evolutionary and scientific ingenuity--how penguins withstand Antarctic winters by huddling together by the thousands, how vulnerable embryos of many species are to extremes of temperature during their development, why people survive hour-long drowning accidents in winter but not in summer, how certain plants generate heat (the skunk cabbage enough to melt snow around it). We also hear of systems gone awry--how desert species given too much water can drink themselves into bloated immobility, why anorexics often complain of feeling cold, and why you can't sleep if the room is too hot or too cold. After reading this book, you'll never look at a thermostat in quite the same way again.
Along with reproduction, balancing energy expenditure with the limits of resource acquisition is essential for both a species and a population to survive. But energy is a limited resource, as we know well, so birds and mammals—the most energy-intensive fauna on the planet—must reduce energy expenditures to maintain this balance, some taking small steps, and others extreme measures.
Here Brian K. McNab draws on his over sixty years in the field to provide a comprehensive account of the energetics of birds and mammals, one fully integrated with their natural history. McNab begins with an overview of thermal rates—much of our own energy is spent maintaining our 98.6?F temperature—and explains how the basal rate of metabolism drives energy use, especially in extreme environments. He then explores those variables that interact with the basal rate of metabolism, like body size and scale and environments, highlighting their influence on behavior, distribution, and even reproductive output. Successive chapters take up energy and population dynamics and evolution. A critical central theme that runs through the book is how the energetic needs of birds and mammals come up against rapid environmental change and how this is hastening the pace of extinction.
Bernd Heinrich's widely praised Bumblebee Economics set a high standard for scientifically accurate yet gracefully articulate writing about nature's ingenious patterns, specifically thermoregulation. Hot-Blooded Insects takes a giant step forward by presenting an overview of what is now known about thermoregulation in all of the major insect groups, offering new insights on physiology, ecology, and evolution.
The book is richly illustrated by the author's exquisite sketches. By describing the environmental opportunities and challenges faced by moths and butterflies, grasshoppers and locusts, dungball rollers and other beetles, a wide range of bees, and other insects, Heinrich explains their dazzling variety of physiological and behavioral adaptations to what, for them, is a world of violent extremes of temperature. These mechanisms are apparent only through precise observations, but the small body size of insects poses large technical difficulties in whole-animal experiments, engendering controversy about the reliability of the data thus derived. Emphasizing an experimental approach, Heinrich pinpoints where he believes studies have gone astray, describing in detail both groundbreaking experiments and those which leave a reasonable doubt about the mechanism being interpreted. He reviews relevant work on the major taxa to show the underlying patterns that draw diversity together, opines on current controversies, and identifies questions that call for further study.
Physiologists, ecologists, entomologists, and zoologists—in fact, all biologists—will be stimulated and challenged to further research by this masterly synthesis of a new field; it will also appeal to informed readers interested in general science.
All bodily activity is the result of the interplay of vastly complex physiological processes, and all of these processes depend on temperature. For insects, the struggle to keep body temperature within a suitable range for activity and competition is often a matter of life and death.
A few studies of temperature regulation in butterflies can be found dating back to the late 1800s, but only recently have scientists begun to study the phenomenon in other insects. In The Thermal Warriors Bernd Heinrich explains how, when, and in general what insects regulate their body temperature and what it means to them. As he shows us, the ingenuity of the survival strategies insects have evolved in the irreducible crucible of temperature is astonishing: from shivering and basking, the construction of turrets (certain tiger beetles), and cooling with liquid feces to stilting (some desert ants and beetles), "panting" in grasshoppers and "sweating cicada," and counter- and alternating-currents of blood flow for heat retention and heat loss.
In The Thermal Warriors Heinrich distills his great reference work, The Hot-Blooded Insects, to its essence: the most significant and fascinating stories that illustrate general principles, all conveyed in the always engaging prose we have come to expect from this author.
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