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Good Reads  Evolutionary Biology  Evolution

Improbable Destinies How Predictable is Evolution?

Popular Science
By: Jonathan B Losos(Author), Marlin Peterson(Illustrator)
368 pages, b/w photos, b/w illustrations
Publisher: Penguin Books
NHBS
The pervasiveness of convergent evolution begs the question, is evolution predictable? This is an excellent book on a big question.
Improbable Destinies
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  • Improbable Destinies ISBN: 9780141981192 Paperback Aug 2018 In stock
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  • Improbable Destinies ISBN: 9780241201923 Hardback Aug 2017 Out of Print #235065
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About this book

See our interview with the author here.

The natural world is full of fascinating instances of convergence: phenomena like eyes and wings and tree-climbing lizards that have evolved independently, multiple times. Convergence suggests that evolution is predictable, and if we could replay the tape of life, we would get the same outcome. But there are also many examples of contingency, cases where the tiniest change – a random mutation or an ancient butterfly sneeze – caused evolution to take a completely different course.

So are we humans, and all the plants and animals in the world today, inevitabilities or evolutionary freaks? What role does chance play in evolution? And what could it tell us about life on other planets?

In Improbable Destinies, renowned researcher Jonathan Losos reveals what the latest breakthroughs in evolutionary biology tell us about one of the greatest ongoing debates in science. Evolution can occur far more rapidly than Darwin expected, which has opened the door to something that was previously thought impossible: experimental studies of evolution in nature. Drawing on his own work with anole lizards on the Caribbean islands, as well as studies of guppies, foxes, field mice and others being conducted around the world, Losos reveals just how rapid and predictable evolution can be.

By charting the discoveries of the scientists who are rewriting our understanding of evolutionary biology, Improbable Destinies will change the way we think and talk about evolution.

Customer Reviews (1)

  • Excellent book on big questions in evolution
    By Leon (NHBS Catalogue Editor) 11 Sep 2017 Written for Hardback


    Convergent evolution is a thing of beauty. Whether it is wings in bats, birds and pterosaurs, or eyes in a range of organisms, evolution often seems to come up with functionally similar solutions to life's challenges. So how predictable is evolution? This is a question that has fascinated generations of biologists and, as Losos quickly makes clear, two famous figures loom large.

    Stephen Jay Gould believed evolution is unpredictable. He coined the now famous thought experiment of "replaying the tape of life". Firmly rooted in a time when video came on VHS and audio on cassettes, he proposed that if you could rewind time and replay the proverbial tape of life, very different life forms would evolve. The other camp is spearheaded by names such as the British palaeontologist Simon Conway Morris, who argue that evolution is deterministic. There are only so many ways to make a living, and for each challenge the environment throws at living beings, there is only one or a limited number of optimal solutions, leading natural selection to repeatedly produce the same evolutionary outcomes.

    For a long time, the debate basically consisted of people compiling lists of examples. Morris and others have shown numerous examples of convergent evolution, not just of traits, but even complete groups of animals evolving in a similar fashion time and again (Losos's work on comparable Anolis lizard communities popping up on different Carribean islands being one example). The other camp points out this is cherry picking of biological examples after the fact and have drawn attention to all the biological oddities and one-offs that have evolved. New Zealand's extraordinary fauna is a prime example of this.

    To really get a grip on this matter we need to do experiments. Once biologists realised that evolution can occur really quickly, in the span of a few generations, studies were undertaken to examine natural selection in wild populations. The book is pleasantly up to date, discussing books published only months prior to this one, such as 40 Years of Evolution: Darwin's Finches on Daphne Major Island or How to Tame a Fox (and Build a Dog) (reviewed here) and well-known work on guppies and sticklebacks. Losos is on form here, writing in an accessible style, leaving out extraneous details, and telling the stories of the researchers engaged in these studies with flair. It's an incredibly fun section of the book and the glee with which it was written jumps off the page. The general picture after decades of field evolution experiments is that, yes, evolution is repeatable. If multiple populations experience the same environment, they tend to evolve in similar ways. However, critics argue that if you start with related populations with similar genetic material for selection to act on, it's quite logical that these populations will evolve along similar lines, subject as they are to the same genetic limitations and options. And by design, these studies ignore the statistical outliers. Of course, populations not showing convergent evolution could also be due environmental variations for which you cannot control. Doing studies in the wild is a messy affair.

    Luckily, a whole cadre of scientists has taken up the challenge of studying evolution in microbes under laboratory conditions, where environmental variables can be precisely controlled. Even this section of the book, which is not Losos's stomping ground, is very well written. Working with microbes has certain advantages for a biologist. Their quick generation times means you can observe changes over thousands of generations in the course of a few years. Microbes can be frozen, which has been used to great effect in long-term experiments to create snapshots of evolving populations, and allowing researchers to thaw these earlier populations out at a later time, literally restarting the tape as Gould suggested in his thought experiment. Here, too, studies show that evolution is repeatable, with identical populations showing identical evolutionary responses.

    And yet, these same studies have also shown that this is not always the case, as a rare change in bacterial metabolism in one of these studies revealed. In this case, it took tens of thousands of bacterial generations, and the change only happened in one of twelve replicates. Further studies showed that a series of unlikely mutations had to conspire in just a certain order for this rare event to happen. But, as the saying goes, given enough time, even the statistically improbable will take place eventually. Maybe we haven't looked long enough in our experiments?

    Also, different mutations can produce functionally similar end results. These details can matter later on. Gould talked about contingency in this context. If you rewind the tape of life and make small changes at the beginning, you might get radically different outcomes. Though this hasn't been explicitly addressed experimentally, some researchers have started with genetically dissimilar microbial populations to see if they evolve in the same way when exposed to similar environmental conditions. And, lo and behold, under these circumstances, populations don't necessarily show convergent evolution.

    With Improbable Destinies, Losos gives a grand tour of the arguments both camps have put forth, and the scientific research that has been done to answer this question. Along the way you get to think along with him as he ponders the different sides and lines up the available evidence. So, is evolution predictable? Losos's conclusion seems perfectly reasonable: part of it depends over what time scale you look, and how comparable your starting points are. Both Gould and Morris have a point. Yes, evolution is subject to constraints, and often there is only a single optimum solution to a problem. With close relatives sharing many genetic similarities, it should not come as a surprise that they will converge on the same evolutionary solutions to life's problems. But it doesn't have to be like this. Starting from different points, with different genetic make-ups and evolutionary histories, evolution can also cause organisms to completely go their own way.

    Improbable Destinies is a splendid piece of science writing that I can highly recommend. If the question this book poses sounds even remotely interesting, you should do yourself the pleasure of reading it.
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Biography

Jonathan B. Losos is the Monique and Philip Lehner Professor for the Study of Latin America and Professor of Organismic and Evolutionary Biology at Harvard University. He is the recipient of a number of awards, including the Theodosius Dobzhansky Prize from the Society for the Study of Evolution and the David Starr Jordan Prize from the American Society of Naturalists.

Popular Science
By: Jonathan B Losos(Author), Marlin Peterson(Illustrator)
368 pages, b/w photos, b/w illustrations
Publisher: Penguin Books
NHBS
The pervasiveness of convergent evolution begs the question, is evolution predictable? This is an excellent book on a big question.
Media reviews

"Improbable Destinies is one of the best books on evolutionary biology for a broad readership ever written. Its subjects – the unfolding of Earth's biological history, the precarious nature of human existence, and the likelihood of life on exoplanets – are presented in a detailed, exciting style expected from an authentic scientist and naturalist
– Edward O. Wilson, University Research Professor Emeritus, Harvard University

"A rich, provocative, and very accessible book, Improbable Destinies is an exclusive behind-the-scenes tour of the ecological theater and evolutionary play of life, expertly guided one of its most insightful observers. Jonathan Losos has shone a light on a largely unheralded cast of fascinating creatures and ingenious scientists who are reshaping our view of why life is the way it is"
– Sean B. Carroll, author of The Serengeti Rules and Brave Genius

"This is a wonderfully serious book with a light-hearted voice. Is evolution predictable or contingent? Big question. Why do adaptations converge? Big question. Why is the platypus unique? Smaller question, but fun! Read, enjoy, think"
– David Quammen, author of The Song of the Dodo and Spillover

"Is evolution a story foretold? Or is it little more than the rolls of DNA's dice? In Improbable Destinies, Jonathan Losos tackles these fascinating questions not with empty philosophizing, but with juicy tales from the front lines of scientific research. Drunk flies, fast-evolving lizards, mutating microbes, and hypothetical humanoid dinosaurs all grace the pages of this wonderfully thought-provoking book"
– Carl Zimmer, author of A Planet of Viruses and The Tangled Bank

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