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Product details
File Size: 5432 KB
Print Length: 306 pages
Publisher: Atria Books (August 26, 2014)
Publication Date: August 26, 2014
Language: English
ASIN: B00LD1OBZ0
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Although the paleontology here has fallen somewhat behind as more recent discoveries and studies have accumulated, the thinking about evolution and the explanations of theories and methods are lucid. The style is enjoyable without oversimplification, so that both advanced students and more casual readers can be informed and entertained.
This is the first book I have read by Carl Zimmer, so I didn't know what to expect. When I first read the title and thought about the subject matter, I assumed this book would be somewhat drab to me. To the contrary, I found Zimmer's coverage of the subject quite interesting, and I was pleasantly surprised by his thorough coverage of this subject. But let's face it, the transition from water to land, and back again in some cases, are really pivotal periods in evolutionary history. It is important to have a grasp on what exactly happened here. If that is of any significance to you, Carl Zimmer has done a brilliant job of explaining the history.Zimmer takes us on a remarkable journey through time attempting to piece together the available evidence to make sense of the transition of life from water to land. In chapter two, he introduces a concept known as exaptation, which captures the idea of an evolutionary adaptation that is later co-opted for different use later on. It seems likely that many functions employed by the land-based tetrapods may have been in development long before they began their adventures on land. I enjoyed the detailed explanation of the development of limbs and hands in chapter three; I thought this material was well presented. For example, Pere Alberch and Neil Shubin noticed a sequence in the development of limbs - each one formed by the same short chain of events. They could actually sketch out the growth with a set of symbols, delineating the development of a limb like a sentence. This came to be called the homology of growth. It explains why you never see triple thighs or other such anomalies; the branching rules just don't allow for it. In chapter four, yet another powerful concept is introduced - correlated progression, where change in one character (feature or attribute of an organism) may influence change in another, such that the rate of change of the two characters is not independent. He continues on with an explanation of lung evolution and the development of amniotes.From chapter five on, the discussion turns to the cetaceans (large aquatic mammals such as dolphins and whales). Evidence indicates that these creatures actually descended from land animals. Zimmer provides an in-depth analysis of the evolutionary history of the whale from the early Archaeocetes (meaning ancient whales) such as Pakicetus to the present day cetaceans.When reading this book, one must keep in mind that it was written in 1998. Today, in 2012, we have fourteen years of additional research and advances that change the picture somewhat. Zimmer alluded to these future developments in chapter nine when describing the conflict in findings between the fossil record and the emerging field of molecular phylogeny (the craft of building gene trees) at that time. Whales were thought to have descended from the mesonychians, an extinct group of hoofed carnivores. However, evidence since then, and the emerging genetic data of that time indicate a relationship to the artiodactyls instead. Nevertheless, there is such a wealth of historical data presented that it is still definitely worth the read.
In "At the Water's Edge," science writer Carl Zimmer describes what we know about the first vertebrates to come ashore, and then discusses the mammals who, millions of years later, went back in. Zimmer is not a scientist. He is a science enthusiast with a degree in English--and this is of great benefit to his readers. In this, his first book, he already exhibits a great deal of talent for explaining the complicated, and making his explanations enjoyable to read.Zimmer describes not only what is known about the evolution of early tetrapods and cetaceans, but he also introduces the reader to the scientists involved, as he narrates the paths of discovery blazed by these evolutionary biologists, embryologists, geneticists, paleontologists, etc. I'll admit I was never much interested in "the human side" of such discoveries until this book introduced me to the people making them. An example that sticks out in my mind is of a PhD candidate who, being unwilling to leave his wife and child for exotic lands, made an important fossil discovery in a road cut in the Catskill mountains, not far from his home.Published in 1999, this book is, of course, now behind by over a decade's worth of discoveries. Chief among these is probably Tiktaalik, a beautiful fish-tetrapod transitional species unearthed in Northern Canada in 2004. Paleontologist Neil Shubin's 2008 book on the discovery, titled "Your Inner Fish", would make an excellent companion to "At the Water's Edge." Both books make great reading for anyone with an interest in evolution and paleontology.
This book is great at explaining the actual mechanics of how evolution works. It reveals the fits and starts, wrong turns and dead ends, and even funny episodes of our relentless quest to understand how the vast array of life came to be as it is. Thoroughly enjoyed it.
Carl Zimmer brings the organizational skills of an experienced journalist and surprising literary talents to present an exquisite, up to date, narrative on the evolution of tetrapods, emerging from the water as amphibians and returning as cetaceans. In this book, he reports on the latest fossil discoveries, the prominent scientific researchers and the direction of their scientific analysis with style, and more importantly, great clarity. Some portions of At the Water's Edge are not easy for armchair paleo-buffs to comprehend, but Zimmer does an admirable job explaining the function of mesenchyme cells and hox genes. What I enjoyed most about this book, was the way Zimmer follows the trail of scientific discovery, documenting every bit of evidence, like a well-tuned detective novel. It's a compelling tale of interaction between paleontologist, geneticists, geologists and embryologists over many years. New fossil specimens demand a reworking of the evolutionary chronology. Our knowledge about the origins of tetrapods, our ancestral forbearers, is enhanced through the process of discovery. What I enjoyed most about Zimmer's work is the sense of objectivity and balance that comes from the third party perspective of a journalist. While Gould, Eldredge, Conway-Morris, Fortey and Bakker provide paleophiles books of great personal insight and passion, At the Water's Edge is completely satisfying in it's precise reportage. This is Zimmer's first book... I hope he's started another!
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