Evolution

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What’s caught my attention this week:

Claude Levi-Strauss passes away at 100. One of the giants, instrumental in establishing the field of modern cultural anthropology.

NOVA: Becoming Human. The first episode in this three-part series aired on Tuesday, but you can watch it online. Nice update of recent fossil discoveries, and how they fit on the hominin evolutionary tree.

Illustration by John Gerrard Keulemans (1842-1912)

Illustration by John Gerrard Keulemans (1842-1912)

Whence the Falklands Wolf? – DNA analysis of museum specimens of an extinct canid species, one collected by Darwin on his journey aboard The Beagle, establishes their closest living relatives as the maned wolves of South America, suggesting the ancestors of the Falkland wolves rafted to the islands from the mainland.

Maned Wolf

Maned Wolf

Image Credits: Wikipedia – Falkland Islands Wolf, Wikipedia – Maned Wolf

Alex and Me

As an anthropologist, I’ve watched the line between humans and other animals become blurrier over time. At one point, only humans were believed to have the ability to make tools, then Jane Goodall documented chimpanzee tool use in the wild.  Next, only humans have culture, but chimp troops have their own learned behaviors that are transmitted across generations, also, including different tool-making traditions.  And the big one, only humans communicate with language, and language is required for higher cognitive function.

And while lots of work has been done with higher primates, Koko and Washoe being notable examples, very little research has been done on language capacity and cognitive function with other members of the animal kingdom.  That’s where Alex comes in.  An African Grey Parrot purchased at a local pet shop by a scientist with an advanced degree in chemistry and a lifelong interest in our avian bretheren and their ability to mimic human speech, Alex was an emissary.  During his 30 year collaboration with Dr. Pepperberg, Alex did much to knock humans off their undeservedly lofty perch.

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A non-primate, nonmammal creature with a walnut-sized brain could learn elements of communication at least as well as chimps.  This new channel of communication opened a window onto Alex’s mind, revealing to me and to all of us the sophisticated [nature of Alex's] information processing [ability].

Dr. Pepperberg also chronicles her journey as a scientist, from her undergraduate days at MIT, to the struggle to find funding for her parrot project (The Alex Foundation helped fill the gaps when grants went unfunded), to jealousy from colleagues when the media picked up on her research, to her return to MIT’s Media Lab with Alex in tow.  While the book is disjointed in places, somewhat short (30 years of research is difficult to compress into 227 pages), and occasionally a little dry (Marley & Me was frankly a better read), the importance of her research to the field of animal cognition makes it worthwhile.

As as scientist who’d like to know more about her research, I think I’ll pick up The Alex Studies: Cognitive and Communicative Abilities of Grey Parrots next.

There’s been some good news on the teaching of evolution front this month. In Oklahoma, the “Scientific Education and Academic Freedom Act” (Senate Bill 320 – rtf) failed to make it out of the Senate Education Committee.  This means it is effectively dead in the Senate for the next two years.  Good thing.  The bill stated, in part, that:

The Oklahoma Legislature finds that an important purpose of science education is to inform students about scientific evidence and to help students develop critical thinking skills they need in order to become intelligent, productive, and scientifically informed citizens.  The Legislature further finds that the teaching of some scientific subjects, such as biological evolution, the chemical origins of life, global warming, and human cloning, can cause controversy, and that some teachers may be unsure of the expectations concerning how they should present information on such subjects.

In reality, there is no controversy among biologists.  Evolution exists; we can measure it.  Like many “Academic Freedom Acts,” it’s an attempt to sneak ID into science classrooms.  Sounds silly, but it worked in Louisiana, where Gov. Bobby Jindal signed the Louisiana Science Education Act into law last summer.  Barbara Forrest posted a penetrating analysis of the bill on the Louisiana Coalition for Science blog.  And last week, the Society for Integrative and Comparative Biology announced they would no longer hold their annual meetings in New Orleans, noting:

The SICB leadership could not support New Orleans as out meeting venue because of the official position of the state in weakening science education and specifically attacking evolution in science curricula…SICB is joining other scientific organizations in suggesting professional societies reconsider any plans to host meetings in Louisiana.  As scientists, it is our responsibility to oppose anti-science initiatives….

Nice to know my home state is one up on Louisiana, but it bodes ill for the scientific education of the children of The Pelican State.

In keeping with the Year of Science theme, this month will focus on celebrating evolution.  To start, here’s first part of the HHMI Holiday Lecture Series from 2005: Evolution – constant change and common threads.

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And here’s a quick quiz to test your own knowledge of evolution.

Smithsonian.com has an interesting essay by Richard Conniff on the development of evolutionary theory.

We call it Darwinism, for short. But in truth, it didn’t start with Darwin, or with Wallace either, for that matter. Great ideas seldom arise in the romantic way we like to imagine—the bolt from the blue, the lone genius running through the streets crying, “Eureka!” Like evolution itself, science more often advances by small steps, with different lines converging on the same solution.

What many fundamentalists seem to forget (or choose to selectively ignore), is the fact that Darwin was a product of his time, and had he not published On the Origin of Species by Means of Natural Selection, someone else (namely Alfred Russel Wallace) surely would have.


Alfred Russel Wallace
Co-founder of the theory of evolution

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