Monthly Archives: November 2012

Godless Gift Idea!

Santa wants you to have this book!
Atheist Voices of Minnesota (which comes in a print version and a Kindle version) is a collection of individual journeys to atheism. All the authors are Minnesotan (natural born, former, or immigrant to the North Star State). While some of the authors are professional writers or high profile bloggers, most are regular people with interesting stories to tell. The essays are selected from a much larger group of submissions, the works are carefully edited, and organized into general categories. The Minnesota connection itself is great for Minnesotans, but really not all that important for general readers; this is simply a collection of stories that help show how Atheism is not a scary cult including baby eaters and hedonistic Satan worshipers. Mostly. And for this reason, it is a great gift for you to give to your family, which probably includes a mixture of believers and non-believers and not-sure-what-to-believers. You can give it to your mom or to Uncle Joe as a gift from you, you can put it in someone’s stocking anonymously, or you can even make it the prize in some Christmas Celebration activity your family celebrates such as the Three-Legged Elf Race or the Inter-Family Scrabble Tournament.

The book has done reasonably well and the initial printing and publishing costs are now paid for, so all the profits from this point forward go to help support Minnesota Atheists, which brings you, among other things, Minnesota Atheists Talk Radio, which is one of the few regular (weekly) shows based in a live radio setting and produced as a podcast that deals directly with issues of interest to Atheists. Many of the shows are about religion, atheism, and related topics, but a good number are about science, science education, and science outreach.

So please consider giving Atheist Voices of Minnesota: an Anthology of Personal Stories to your friends, families, and loved ones for Christmas, Winter Solstice, Hanukah, or Kwanza this year!

The Authors include Norman Barrett Wiik, Elizabeth Becker, Kenneth Bellew, Ryan Benson, August Berkshire, Donald L. Boese, Ryan Bolin, Jill Carlson, Justin M. Chase, Greta Christina, Linda Davis, Andrew Downs, Shannon Drury, Anthony Faust, Paul Gramstad, Mike Haubrich, Kori Hennessy, Peter N. Holste, Michelle M. Huber, Eric Jayne, George Kane, Greg Laden, Bill Lehto, M. A. Melby, PZ Myers, Robin Raianiemi, Rohit Ravindran, Jason Schoenack, Kim Socha, Chris Stedman, Elizabeth Stiras, Todd N. Torkelson, Timothy Wick, Rob Young, James Zimmerman, Jennifer Zimmerman, and Stephanie Zvan.

Nature: Do the carbon tax, America!

Nature, the journal, has come out in favor of the US congress acting on a Carbon Tax now.

As looming tax increases and budget cuts threaten to plunge the US economy back into recession, Congress should take a hard look at introducing a carbon tax as an important part of the solution.

This week, a reinvigorated Barack Obama returned to the White House knowing that he was poised on the edge of a fiscal cliff. Rather than relishing his victory last week, Obama must immediately set about crafting a compromise on deficit reduction with congressional leaders. The stakes could hardly be higher — for science, for US citizens and, indeed, for the world. In the event of failure, a budgetary time-bomb of tax increases and sweeping budget cuts will detonate on 2 January. As well as resulting in indiscriminate cuts to funds for scientific research and many other areas, it could knock the United States back into recession and deliver yet another blow to an already fragile global economy.

Just consider the possibilities. To put a levy on carbon would raise revenues that could be used to offset lower tax rates for individuals and businesses. This is what conservatives say they want to do. It would put more income — and thus choice — in the hands of consumers. Economists like the idea for more fundamental reasons. Generally, it is best to tax things that one wishes to discourage (such as smoking) rather than those that should be encouraged (such as working). Environmentalists like the idea of a carbon tax because it could generate some much-needed revenue for clean-energy research and development while reducing carbon emissions.

The editorial is here. I think it is not behind a paywall.

Congratulations Debbie Goddard!

Debbie Goddard, one of my favorite people, and one of the reasons that the skeptics movement is worth keeping despite that fact that it can be annoying somehow, has just been appointed to a new position at CFI:

The Center for Inquiry (CFI) is proud to announce that Debbie Goddard, formerly CFI’s campus outreach coordinator, has accepted the position of Director of Outreach. She replaces Lauren Becker in that role, who has shifted to her new position as Director of Marketing, as previously announced.

“Debbie has been a part of the heart of CFI for a long time now, embodying what it means to be a dedicated CFI employee. She has given a great deal of herself to this organization and its cause: bringing about a world that values science, reason, and compassion over dogma and superstition,” said Ron Lindsay, CFI’s President and CEO. “We are all proud to see Debbie take on this crucial leadership role in which we know she will excel.”

Read the whole press release here.

Just In Time for The Hobbit: The Science of Middle Earth

Just a quick note, review to come later. Henry Gee has produced a Second Edition of his book The Science of Middle-Earth: Explaining The Science Behind The Greatest Fantasy Epic Ever Told!, which will be released on December 14th as a Kindle eBook.

There are two things to know about this. First, the Second Edition is revised enough to want to get it even if you have the first edition. Second, if you are not familiar with the book, it may be a bit different than you expect. It is not a book about the science IN Tolkein’s books as much as it is a scientifically oriented investigation of Tolken, the world he created, and the relationship between that made up world and the real world that provided the context for the created universe. Gee is a scholar of Science Fiction literature and his prowess in this field is well demonstrated by his cogent and deep analysis of Tolkien. The Science of Middle-Earth: Explaining The Science Behind The Greatest Fantasy Epic Ever Told! is a philology of the pertaining documents, an anthropology (both cultural and biological) of the languages of that world, and an historical investigation of origins. There is demographics and life history theory, geology, genetics, allometry, and some attention to the mechanics of locomotion of trees and flying things.

You will probably want to read this before you see The Hobbit.

I’ll let you know if I notice the book’s early availability.

Are Children "Natural Scientists" or not?

ResearchBlogging.orgNeil deGrasse Tyson if famous for telling us that children are natural scientists, and cautioning us to be careful not to ruin that thing about them. He makes a good case. No one ever thought, I think, that he meant that children were born resistant to the sorts of biases that scientists actively eschew, or with a developed sense of probability theory that all scientists need to evaluate their work and the work of others, and those other tools that scientists get trained in for several years before they can really call themselves scientists. He mean, rather … how shall I put this. Oh hell, you can see what he says here:

Now, there is controversy, and it is my job as your blogger to tell you about it. It starts with the video above and others like it, and is expanded on by a paper by Claire Cook, Noah Goodman and Laura Schulz in the journal Cognition called “Where science starts: Spontaneous experiments in preschoolers’ exploratory play” (PDF) which hast this abstract:

Probabilistic models of expected information gain require integrating prior knowledge about causal hypotheses with knowledge about possible actions that might generate data relevant to those hypotheses. Here we looked at whether preschoolers (mean: 54 months) recognize ‘‘action possibilities’’ (affordances) in the environment that allow them to isolate variables when there is information to be gained. By manipulating the physical properties of the stimuli, we were able to affect the degree to which candidate variables could be isolated; by manipulating the base rate of candidate causes, we were able to affect the potential for information gain. Children’s exploratory play was sensitive to both manipulations: given unambiguous evidence children played indiscriminately and rarely tried to isolate candidate causes; given ambiguous evidence, children both selected (Experiment 1) and designed (Experiment 2) informative interventions.

To make that just a tad more clear, here is a bit more from the same paper:

These results suggest that preschoolers distinguish, not only ambiguous and unambiguous evidence but also potentially informative and uninformative interventions. In cases where there was information to be gained, preschoolers spontaneously selected (Experiment 1) and designed (Experiment 2) actions to effectively isolate the relevant variables. Critically, the target experiments were not otherwise part of children’s exploratory repertoire; children almost never performed them given unambiguous evidence.

So, scientists seem to have found evidence that children have certain key behavioral characteristics that one would normally see in a growed-up scientist.

Also, we have the blog post “More Than Child’s Play: Ability to Think Scientifically Declines as Kids Grow Up” by Sharon Begley.

Since the 1990s studies have shown that children think scientifically—making predictions, carrying out mini experiments, reaching conclusions and revising their initial hypotheses in light of new evidence.

She discusses the above cited paper, and concludes:

… If even the youngest kids have an intuitive grasp of the scientific method, why does that understanding seem to vanish within a few years? Studies suggest that K–12 students struggle to set up a controlled study and cannot figure out what kind of evidence would support or refute a hypothesis. One reason for our failure to capitalize on this scientific intuition we display as toddlers may be that we are pretty good, as children and adults, at reasoning out puzzles that have something to do with real life but flounder when the puzzle is abstract, Goodman suggests—and it is abstract puzzles that educators tend to use when testing the ability to think scientifically. In addition, as we learn more about the world, our knowledge and beliefs trump our powers of scientific reasoning. …

Now, we have the dissenting view, from Matthew Francis at Galileo’s Pendulum, in his post “Children Are Not “Natural” Scientists“:

A pernicious myth, repeated with good intentions in many places and by many people, is that children are natural scientists. They are born with something that gets beaten or worn out of them by bad teachers, bad schools, bad educational practices, and then must relearn what it means to be a scientist later in life. Like many myths, there’s a mixture of truth and falsehood, but ultimately the myth is damaging and leads us into bad habits of thought.

One gets the impression that Matthew does not like the idea. He states:

“Thinking like a researcher” is not the same thing as a natural curiosity and mental plasticity — scientific research is very much a learned skill, in my experience, but I admit to being entirely ignorant of child development…

The answer, of course, may be more nuanced than simply “yes” or “no” to the scientific kung fu of children, and for nuanced answers we look to people like Marie-Claire Shanahan, who always has interesting and valuable things to say. Marie-Claire argued some time before this recent questioning of the issue arose that Students don’t lose their ability to think scientifically:

…school children and teenagers continue to understand the basics of experimentation very well. There are several resources for teaching the concept of fair testing in science. They usually begin with intuitive ideas related to general fairness, like using the analogy of a race where everyone must start at the same place and take the same route. Even the idea of a fair test experiment, though, gives a very simplified introduction to scientific investigations. What is much more difficult is, for example, the idea of a variable. And here’s where I disagree not just with Sharon Begley but with the authors of the paper. By trying to isolate which blocks will make the toy work, the children are not isolating variables. There is only one variable – the blocks – and the children have found an innovative way to try to test one block at a time.

… Even simple variables like length are more challenging than they seem. It is one thing to measure the length of a particular piece of string, quite another to conceive of length as a general property that can be measured or manipulated in any object. This especially true because it is also somewhat arbitrary, requiring the person doing the experiment to choose an operational definition (e.g., by defining length as the measurement of the longest side). There is no concrete thing called length. It is an abstract word that describes a type of measurement. Understanding that is much harder than trying to find a way to measure it in specific objects, which is analogous to what the children are doing in trying to find a way to test each block individually.

Personally, I don’t think there is a lot of disagreement here. Neil deGrasse Tyson is right: Children ruin things in their never ending quest to find out what they are. The cited experimental research demonstrates that children have certain aspects of the scientific method built in. Marie-Claire is correct in parsing out the fact that true adult scientists have created a discipline in which things that are hard to automatically address are seen to with methology and theory, things that people would not automatically think of on their own.

I’m reminded of some of my recent reading in the literature of Witch Hunting in the late Middle Ages and early Enlightenment in Europe. The argument went like this: There are typical characteristics of Witches that let you identify them. Thus, there is a list of interrogations one uses to spot the Witch. Part of the methodology is to torture the suspected Witch until she or he confesses. It seems like every time a Witch is found, the interrogation produces the same result, confirming the method. Everyone involved seemed to believe this; there is even evidence of individuals “realizing” that they must be a Witch because they confessed under torture to the accusations of the inquisitor. That’s how adults seem to think when left on their own. But at the same time thousands of Witches were being “found” and usually executed, other adults were busy inventing hydropower and figuring out that the Earth is round and that there are planets, and that various elements existed with specific properties, and so on and so forth.

Are children born pre-scientists? Probably. Do we ruin them? Maybe, maybe not. More research is needed.


Cook, C., Goodman, N., & Schulz, L. (2011). Where science starts: Spontaneous experiments in preschoolers’ exploratory play Cognition, 120 (3), 341-349 DOI: 10.1016/j.cognition.2011.03.003

Greenhouse Gas Levels Reach New Record High

You may have heard that the release of greenhouse gases has recently gone down, to match levels of several years ago. Why, then, do we have someone saying that greenhouse gasses have reached a new record high?

There are two, maybe three, reasons.

First, even though CO2 release from the US may be lower now than it has been in a few years, it is still high (it was high a few years ago, so we’ve reduced to a level that is high!). More importantly, the US has reduced its release of CO2 primarily for incidental economic reasons. With a recession/depression going on, there is less money being spent on things that burn fuel. But, we are also producing more fossil carbon-containing products that we send to other countries, where that fuel is burned, thus releasing the CO2. So, globally, CO2 release is probably as high as it has ever been, more or less.

Second, the greenhouse gasses stay in the atmosphere for a long time. Releasing less does not make what is there go away, really. So if we add less for a couple of years, we still increase the amount.

Third, and less understood, and perhaps not even part of the current calculation of greenhouse gas release, is the extra methane that is being released at large but as yet understudied quantities from drilling operations including those that involve fracking.

So, with those caveats, we have this report from the UN’s World Meteorological Organization:

Greenhouse Gas Concentrations Reach New Record: WMO Bulletin highlights pivotal role of carbon sinks

Geneva, 20 November (WMO) – The amount of greenhouse gases in the atmosphere reached a new record high in 2011, according to the World Meteorological Organization. Between 1990 and 2011 there was a 30% increase in radiative forcing – the warming effect on our climate – because of carbon dioxide (CO2) and other heat-trapping long-lived gases.

At this point I would like to pause and note something important. Here we learn that there has been a 30% increase in warming effects from 1990 onward. This does not mean, however, that Anthropogenic Global Warming (AGW) started in 1990. You will often see Climate Science Denialists refer to events earlier in the last 100 years as evidence that global warming is not real. If global warming supposedly causes large storms, and there was a large storm in the 1930s, or if global warming supposedly causes droughts, and there was the Dust Bowl in the 1930s, then global warming is not real, the story goes. However, global warming is largely the result of the release of Carbon from the burning of coal and petroleum, and that (especially the coal) started way back in the 18th century and really took off in the mid 19th century. Global warming and its effects have certainly been much more significant over the last several decades, but the effects are much older than that. To return to the UN report…

Since the start of the industrial era in 1750, about 375 billion tonnes of carbon have been released into the atmosphere as CO2, primarily from fossil fuel combustion, according to WMO’s 2011 Greenhouse Gas Bulletin, which had a special focus on the carbon cycle. About half of this carbon dioxide remains in the atmosphere, with the rest being absorbed by the oceans and terrestrial biosphere.

“These billions of tonnes of additional carbon dioxide in our atmosphere will remain there for centuries, causing our planet to warm further and impacting on all aspects of life on earth,” said WMO Secretary-General Michel Jarraud. “Future emissions will only compound the situation.”

“Until now, carbon sinks have absorbed nearly half of the carbon dioxide humans emitted in the atmosphere, but this will not necessarily continue in the future. We have already seen that the oceans are becoming more acidic as a result of the carbon dioxide uptake, with potential repercussions for the underwater food chain and coral reefs. There are many additional interactions between greenhouse gases, Earth’s biosphere and oceans, and we need to boost our monitoring capability and scientific knowledge in order to better understand these,” said Mr Jarraud.
“WMO’s Global Atmosphere Watch network, spanning more than 50 countries, provides accurate measurements which form the basis of our understanding of greenhouse gas concentrations, including their many sources, sinks and chemical transformations in the atmosphere,” said Mr Jarraud.

The role of carbon sinks is pivotal in the overall carbon equation. If the extra CO2 emitted is stored in reservoirs such as the deep oceans, it could be trapped for hundreds or even thousands of years. By contrast, new forests retain carbon for a much shorter time span.
The Greenhouse Gas Bulletin reports on atmospheric concentrations – and not emissions – of greenhouse gases. Emissions represent what goes into the atmosphere. Concentrations represent what remains in the atmosphere after the complex system of interactions between the atmosphere, biosphere and the oceans.

CO2 is the most important of the long-lived greenhouse gases – so named because they trap radiation within the Earth’s atmosphere causing it to warm. Human activities, such as fossil fuel burning and land use change (for instance, tropical deforestation), are the main sources of the anthropogenic carbon dioxide in the atmosphere. The other main long-lived greenhouse gases are methane and nitrous oxide. Increasing concentrations of the greenhouse gases in the atmosphere are drivers of climate change.

The National Oceanic and Atmospheric Administration’s Annual Greenhouse Gas Index, quoted in the bulletin, shows that from 1990 to 2011, radiative forcing by long-lived greenhouse gases increased by 30%, with CO2 accounting for about 80% of this increase. Total radiative forcing of all long-lived greenhouse gases was the CO2 equivalent of 473 parts per million in 2011.

The report goes on to state that CO2 is the single most important human generated greenhouse gas, but also discusses methane, which I mentioned above, and discusses Nitrous oxide as well.

(Thanks to Brad Johnson for the info on hydrocarbon exports.)

The Domestic Turkey and the First Thanksgiving

This is the time of year that we rightfully contemplate the noble Turkey. The very first thing we notice about this large member of the Galliformes is that there is a wild version and a domestic version, and although the two are rather different, they are both given the same species name, Meleagris gallopavo. This is not entirely unknown among domestic animals, but many domesticates have no living wild version. Thus, the cattle we raise for meat and dairy are sometimes called Bos taurus while the extinct wild form is always called Bos primigenius. The domestic cat has the uninspired name Felis catus in some circles, or otherwise, Felis silvestris while the wild version (not the feral version, but the wild cat that lives in Africa today) was once known by a Latin binomial that is no longer polite to say, for a while as Felix lybica, and now, owing to the trend of reconflating wild and domestic forms when they are known to interbreed, as Felis silvestris lybica. The domestic dog was once and still often is Canis familiaris as opposed to the wolf, Canis lupus, but the former which is really a subspecies of the latter is now Canis lupus familiaris. I don’t believe, but this is subject to correction, that the wild and domestic Turkey were ever called by different binomials.

… Read More …

Dennis Markuze, aka Dave Mabus, Arrested in Montreal

These are the tweets from the Montreal Police:

For those who don’t know, Dennis Markuze is a perennial internet-only (so far) stalker who has been sending nasty emails and tweets to anyone he sees as a key Atheist figure or anyone thusly linked, and posting rambling often offensive sometimes threatening blog comments on our blog sites, for several years now. He is a Nostradamus cultist. A while back he was arrested and put by Montreal authorities into psychiatric care, and later released under certain conditions including that he not bother people on line any more. More recently he started up again with his old habits, the community of those he harasses complained again to the authorities, and he was, as you can see, re-apprehended.

For more information on him click here.

How old is the Earth?

I can’t believe we still have to cover this. We know how old the Earth is. The science on this is pretty darn good. It is 4.54 billion years old plus or minus about 1%.

Florida Senator Marco Rubio does not know how old the earth is. Here is what he says about it:

I’m not a scientist, man. I can tell you what recorded history says, I can tell you what the Bible says, but I think that’s a dispute amongst theologians and I think it has nothing to do with the gross domestic product or economic growth of the United States. I think the age of the universe has zero to do with how our economy is going to grow. I’m not a scientist. I don’t think I’m qualified to answer a question like that. At the end of the day, I think there are multiple theories out there on how the universe was created and I think this is a country where people should have the opportunity to teach them all. I think parents should be able to teach their kids what their faith says, what science says. Whether the Earth was created in 7 days, or 7 actual eras, I’m not sure we’ll ever be able to answer that. It’s one of the great mysteries.

Phil Plait has responded with this:

Actually, it’s not a great mystery. It used to be … a century ago. I am a scientist, and I can tell you that nowadays—thanks to science—we know the age to amazing accuracy. The age of the Earth is 4.54 billion years … plus or minus 50 million years. That’s a number known to an accuracy of 99 percent, which is pretty dang good.

Sen. Rubio’s answer, however, is so confused and error-riddled its difficult to know where to start.

And then, Phil goes ahead and addresses that, HERE.

The Maddow Blog also addresses Senator Rubio’s miscarriage of intelligence.

And, the thing is, the actual story about how we know about the age of the earth is not only well established science, but it is intrinsically interesting. Following is from a post I wrote about this a while back, slightly edited:

How old is the earth?

Short answer: 4,540,000,000 Earth-years, plus or minus 1%.

Long answer: We don’t know exactly because direct dating of the earliest material on the surface of the Earth will only tell use a minimum age; Prior to that, the Earth’s surface was probably molten, and even after that, it may be that the earliest non-molten material has been recycled into the planet’s interior by tectonic processes. Also, the earth is a big round ball of stuff that condensed into this shape from part of a large disk-shaped blob of stuff known as the Solar Nebula. When exactly, given this, did the Earth become the Earth? Since the process took millions of years, we can’t pinpoint the age of the Earth more exactly than a certain range.
Continue reading How old is the Earth?

You come from Cannibals

A man “lies crumpled on the sand … Behind him a dark trail leads back to the spot from which he has just been dragged. Looking closer, we notice something slightly odd about the figure crouching over the wounded man. His posture does not suggest a doctor attempting to staunch bleeding, or even to check heartbeat or pulse. Look a little closer still, and you may be inclined suddenly to reel back or to close your eyes. The man sprawled at such an odd angle beside the injured [man] has his face pressed against a gaping tear in [his] throat. He is drinking blood fresh from the wound…” Why? Well, to cure his epilepsy, of course. The date is 24 AD, the injured man is a gladiator, and the man drinking the blood must have bribed his way to the front of the line because he’s getting what a lot of other people in Ancient Rome routinely sought. A nice blood meal, for medicinal purposes, of course. Continue reading You come from Cannibals

Among Cannibals

I have lived among Cannibals, according to a lot of people who claim to know. The number of times that the “tribal” people of the Congo have been called cannibals is too great to be counted, most notably in great literature like The Heart of Darkness but most commonly, I suspect, from the pulpit or soap box by those raising money to spread this or that word. Most Europeans and Americans don’t know it, but many people who live in the Congo are quite convinced that the bazunga … the white foreigners … are cannibals. I’ve listened closely to these assertions, made by many individuals, and I’ve lived in both places for considerable time and I can say something about these claims.

They have a case. Continue reading Among Cannibals

A Remarkable Convergence of Species: The Deadliest Sea Snake

ResearchBlogging.orgSea snakes are true snakes that look a little like eels because of their horizontally flattened rudder-like tails, and they spend a lot of time…for most species, their entire lives…in the ocean. Only one species seems to be able to move on land at all. They seem to all be venomous, some extremely so. They are all tropical or near-tropical, and there are numerous species distributed among about 15 genera.

One species is Enhyrina schistosa, known as the Beaked Sea Snake, or the Hook-Nosed Sea Snake. It lives in the waters near Indonesia and Australia. This is known to be the most venomous of all of the sea snakes, and a certain number of people are bitten by them. In fact, most people who die of sea snake bites were bitten by Enhyrina schistosa. How many people get bitten by them? Hard to say. In Australia, between 1942 and 1950, 56 people died from sea snake bites. What is the meaning of that number? Hard to say; it is just one of those esoteric bits of information one finds in Wikipedia. These snakes probably don’t bite very many people, but when they do, you have a problem.

The Beaked Sea Snake feeds mainly on spiny catfish and blow fish, and as such benefits from have a large gape. Selection for the large gape has altered the morphology of this snake in a way that probably contributes to it’s beaked nose and a couple of other features that are used to distinguish it from other sea snakes and thus identify it to species. The problem is, this selection pressure seems to have caused two distinctly different groups of snakes (actually, three … see below) to converge on a single morphology. So, what we have been calling Enhyrina schistosa, the beaked sea snake, is clearly two distinct species that look enough alike to have been confused as one. This is destine to be a classic example of evolutionary convergence.

This is all being reported in a paper due out soon in Molecular Phylogenetics & Evolution by Kanishka D.B. Ukuwela, Anslem de Silva, Mumpuni, Bryan G. Fry, Michael S.Y. Lee and Kate L. Sanders. Caroline Bird of the University of Queensland Communications Office provided some background and the great snake picture.

From the abstract of the paper:

We present a striking case of phenotypic convergence within the speciose and taxonomically unstable Hydrophis group of viviparous sea snakes. Enhydrina schistosa, the ‘beaked sea snake’, is abundant in coastal and inshore habitats throughout the Asian and Australian regions … Analyses of five independent mitochondrial and nuclear loci for populations spanning Australia, Indonesia and Sri Lanka indicate that this ‘species’ actually consists of two distinct lineages in Asia and Australia that are not closest relatives. As a result, Australian ‘‘E. schistosa’’ are elevated to species status and provisionally referred to Enhydrina zweifeli. … Our findings have important implications for snake bite management in light of the medical importance of beaked sea snakes and the fact that the only sea snake anti-venom available is raised against Malaysian E. schistosa.

Have a look at this diagram:

Fig. 4. Bayesian multi-locus coalescent species tree. Asian and Australian Enhydrina schistosa lineages form separate and distantly-related clades (each with affinities to geographically proximate taxa). Nodes with Bayesian posterior probability >0.9 are indicated. Outgroup Hemiaspis damelii is not shown. (Scale bar = substitutions per site).

You can see the two populations, from Australia (top) and Southeast Asia (bottom), separated by numerous other species that look very different. And, if you look at just the Southeast Asian group, they cluster into two subgroups as well. Apparently this genetic divergence and grouping was not noticed by prior researcher dividing the snakes up into species and genera on the basis of morphology. Having said that, it is also true that the sea snakes are a bit dicy in their overall phylogeny, and are understudied. This, apparently, is being rectified.

There are other potential explanations for this pattern that should be considered, involving the genetics. It is possible to come up with a genetic tree that inaccurately represents the actual phylogeny of the species at hand. This study, however, used multiple methods and multiple DNA sites, involving both mitochondrial and nucleic DNA, so the species tree you see here is probably reasonably close to accurate, and the conclusion that Enhydrina schistosa consists of two groups that are not monophyletic is strong.

“This mixup could have been medically catastrophic, since the CSL sea snake antivenom is made using the venom from the Asian snake based on the assumption that it was the same species,” noted Bryan Fry, one of the study’s authors. “Luckily, the antivenom is not only very effective against the Australian new species but actually against all sea snakes since they all share a very stream-lined fish-specific venom.”

Wear a wet suit!


Ukuwela, K., de Silva, A., Mumpuni, ., Fry, B., Lee, M., & Sanders, K. (2012). Molecular evidence that the deadliest sea snake Enhydrina schistosa (Elapidae: Hydrophiinae) consists of two convergent species Molecular Phylogenetics and Evolution DOI: 10.1016/j.ympev.2012.09.031


Get the latest news about Sungudogo, the science fiction adventure story set in the Congo, which serves as a new Origin Story for the modern Skeptics Movement, HERE.