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Lynn Margulis, who has died aged 73, was a microbiologist whose

work on the origin of cells transformed the study of evolution - with

James Lovelock, she also developed the "GAIA theory" of Earth as a

vast self-regulating system.

Though advancing such theories exposed her to enormous hostility from

within the scientific community, she came to be regarded as one of the

most creative and respected researchers of her generation.

In the 1960s Lynn Margulis became convinced that, while Darwin had

successfully proved that all species of living things are descended from

earlier ones, neither he nor his followers had ever satisfactorily explained

the source of the variation that gives rise to new species.

Lynn Margulis’s theory of “symbiogenesis” challenged the Neo-Darwinist

consensus by suggesting that inherited variation does not come, or does

not come exclusively, from random genetic mutation but from long-lasting

interaction between organisms.

At first the idea met with scorn: her findings were rejected by 15 academic

journals and grant applications were brusquely rebuffed. The response to

one application was...

Your research is crap. Don’t ever bother to apply 
again.

It did not help that Lynn Margulis did not conform in any way to the calm,

collaborative ideal of the research scientist - or that she was a woman.

Provocative, quick-tempered and prone to hyperbole, she was a self-

confessed misanthrope who never bothered to disguise her contempt for

her critics. She once described the great British Darwinian John Maynard

Smith as “codifying an incredible ignorance”, his research “reminiscent of

phrenology”.

Her view of the Neo-Darwinists in general was equally withering. They

were, she said members of “a minor 20th-century religious sect within the

sprawling religious persuasion of Anglo-Saxon Biology. Neo-Darwinism is

... complete funk.”

Lynn Margulis continued collecting data, reworked her paper and, in 1967,

published her theory in The Journal of Theoretical Biology. The response

was total silence. As she put it later, her theory “crossed willy-nilly the

boundaries that people had spent their lives building up. It [hit] some 30

subfields of biology, even geology.” But she persisted, and in 1970

expanded her original paper into a book, The Origin of Eukaryotic Cells.

Gradually scientists began to accept as a near certainty that the

mitochondrion was once a free-living bacterium that invaded another

larger bacterium to form a stable symbiotic relationship. Similarly, the

chloroplast — the organelle found in green plant cells that enables

photosynthesis — was also once a free-living bacterium that entered into

a symbiotic relationship with another cell.

Eventually Lynn Margulis’s theory became scientific orthodoxy.

In 1979 she won a Guggenheim fellowship and two years later she

rewrote her book and renamed it Symbiosis in Cell Evolution.

The book is now regarded as a classic of 20th-century biology.

It was Lynn Margulis’s expertise in microbes that led her, in the mid-

Seventies, to the British atmospheric chemist James Lovelock, who had

come to suspect that living organisms had a greater effect on the

atmosphere than was commonly recognised. Together they proposed a

theory that Earth itself — its atmosphere, the geology and the organisms

that inhabit it — is a self-regulating system in which living organisms help

to regulate the terrestrial and atmospheric conditions that make the planet

habitable.

In particular they suggested that plankton act as a living thermostat,

helping to regulate global temperature; that bogs and peat lands affect

glaciers as the organisms within them release and absorb greenhouse

gases; and that colonies of bacteria and other microbes in tidal mud flats

process enough salt to help keep ocean salinity fairly constant. It was

Lovelock who suggested they call their hypothesis Gaia, after the ancient

Greek goddess of the Earth.

While scientific opinion came round to Lynn Margulis’s theory of

symbiogenesis, however, many scientists continue to regard the Gaia

theory as unconvincing — closer to philosophy than to falsifiable scientific

theory.

Lynn Margulis lived her life at a frenetic pace. As well as her research work

she churned out scientific articles, videos, reviews and 20 or so books,

some of them co-authored with her son, Dorion Sagan.

She was elected to the National Academy of Sciences in 1983

and received the National Medal of Science in 1999.

Lynn Margulis is survived by a daughter and three sons.

Lynn Margulis, born March 5 1938, died November 22 2011

 

.

Views: 113

Comment by Michael Grove on March 12, 2014 at 8:28

"Disclosing the sentience of ALL NATURE, and revealing the unsuspected effect of the

more-than-human on our language and our lives, in unprecedented fashion, ABRAM

generates true philosophy for the twenty-first century."


Lynn Margulis, originator of the GAIA Hypothesis, author of WHAT IS LIFE ?

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