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Product details

File Size: 1145 KB

Print Length: 164 pages

Publisher: Basic Books; 1st edition (August 5, 2008)

Publication Date: August 5, 2008

Sold by: Hachette Book Group

Language: English

ASIN: B003PJ6UIY

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I became interesting in this book because of Lynn Margulis's theory called symbiogenesis. This evolutionary term refers the origin of tissues, organisms and even species through a long-term form of symbiosis. After describing her early start in the subject matter, she notes that she has always felt that genetics was the key to evolutionary history. She observed that three classes of organelles located outside of the nucleus of a cell (plastids, mitochondria, cilia) "resembled bacteria in their behavior and metabolism."In the chapter on Individuality by Incorporation, she tries to make the case for the symbiotic process. For example, an archaebacterium merges with a swimming bacterium, which subsequently merges with an oxygen-breathing bacterium, which subsequently engulfs, but fails to digest, a photosynthetic bacterium ultimately evolving into a swimming green algae. It is believed that our mitochondria in our cells and the chloroplasts in plant cells are of bacteriological origin. These processes are part of the theory called Serial Endosymbiosis Theory or SET. Margulis next delves into the problems with taxonomy or the classification of life. She discusses Robert Whittaker's (1924-1980) five-kingdom classification, but then goes on to develop a modified version that she feels more accurately "reflects the evolution of protoctists from symbiotic bacteria, and of animals, plants and fungi from protoctists."In discussing evolution, the author notes that the bacterial cell is the minimal unit of life, and this is where one must begin. These organisms are like more advanced life; they use energy to take up food, have DNA and RNA and proteins, and use chemical reactions to keep themselves going. It is interesting to note that "no life-form exists outside a self-maintaining, self-reproducing cell." She spends a chapter discussing the possible origins of sex which I found interesting. Moving on to the evolving of life on land, Margulis feels strongly that symbiogenesis is what made habitation on land possible. She concludes the book with a chapter on Gaia, which she defines as the physiologically regulated Earth, or the "system that emerges from ten million or more connected living species that form its incessantly active body."I found the book fairly readable for the layperson; however, you may have to research some terminology. In one chapter, for example, I came across a few undefined words or expressions, such as photosynthate food, fungal hyphal networks, and chitinase enzymes to name a few. The concept of SET is very interesting, and it appears to be another facet in our quest to understand the process of evolution.

This thin book is an eyeopener for anyone not acquainted with the concept of symbiogenesis, the idea that new species occur through symbiosis. Although her work is with protists, symbiosis is found in multicellular organisms such as trees, cows, termites, etc. One protozoa is even made up of five organisms.Her theory met with considerable opposition, and Margulis points to her predecessors, both Americans and Russians for similar work, as well as her contemporaries. We also get a snippet about her life and how a series of events led her to her present scientific and personal position. An extension of her theory to a planetary basis is Lovelock's Gaia theory which, in turn, has received considerable opposition and scorn. That, too, was preceded by a Russian scientist named Vernadsky.

Eating and reproducing among even the tiniest life forms is made into an incredibly fascinating journey by Lynn Margulis in this skinny publication. I found myself cheering for her explanatory theories of evolution all the way. There is something very compelling about including bacteria in the grand narrative about evolution not just in the case of humans, but in general, after all it was tiny bacteria and simple cell organisms that turned this planet into the blue gem it is today. The details of her theories are a little more involved and therefore more complicated to explain here. It is a worthwhile read even for readers who doubt their backgrounds in biology as she makes everything as clear as possible for lay readers.

Very impressive and revealing. I was so interested to learn more about the idea of symbiosis in cell evolution. I have read that there is a lot of controversy about her teachings and ideals. But regardless, she does prove some incredible points about the mystery of early life on this planet and points out that we are all living symbiotic beings, or living ecosystems as some say, and that even after learning this, we still cannot help but take it for granted.

An absolutely great book! If anyone wants to open their mind regarding the origin of humanity, this starts at the very Beginning.The author does not speculate as to where our human form might go, but there is plenty of ground to cover between our origin and today.

Bacteria merging and becoming parts of cells, organelles, i.e. creating new organisms, is the idea behind the evolution discussed in this book. That is putting it in simple terms. If you have some basic biology education, this book will add a lot to your understanding of how evolution, outside the nucleus of cells, takes place, perhaps far more meaningful than the odd mutation which occurs in nuclear DNA.

Beyond anything else this book should dispel the folk interpretation of Darwinism, the misconception that survival of the fittest is as simple as dog eat dog competition. Symbiotic Planet tells the story of the integral quality of life. Margulis details in sophisticated, yet readable, prose the way in which evolution has progressed by bringing together life forms to build more complicated structures.

Very good book. easy to understand. I used for background for a class. learned to love Lynn Margulis. Well worth the time to read. Will give you a new perspective on evolution.

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