SkepticblogSkepticblog logo banner

top navigation:

Happy Darwin Day!

by Donald Prothero, Feb 15 2012

Niles Eldredge as he looks today, Curator Emeritus at the American Museum of Natural History

Experimental biology … may reveal what happens to a hundred rats in the course of ten years under fixed and simple conditions, but not what happened to a billion rats in the course of ten million years under the fluctuating conditions of earth history. Obviously the latter problem is more important.

—George Gaylord Simpson, 1944, Tempo and Mode in Evolution

Last Sunday, Feb. 12, we celebrated the 203rd birthday of two of the most important figures in world history, Abraham Lincoln—and Charles Darwin. To mark the occasion properly, I spent part of my weekend visiting the Creation Museum in Santee, California, with Carrie Poppy and Ross Blocher of the podcast “Oh no, Ross and Carrie!” (more on that trip in my March 7 post). But I thought I’d mark this anniversary with a discussion of another important anniversary in the history of evolutionary science.

(left to right) Stephen Jay Gould, Michael Shermer, and yours truly, Mt. Wilson Observatory, 2001

It was 40 years ago this year that the most frequently cited  paper in the history of paleontology was published. That was none other than the legendary 1972 article by Niles Eldredge and Stephen Jay Gould which proposed the “punctuated equilibrium” hypothesis. (Full disclosure: I took seminars from Niles while I was a student at the American Museum of Natural History, and Steve Gould was very interested in and supportive of my research even though I was not his student in a formal sense). At the time the paper came out, the dominant concept about speciation was the allopatric speciation model. In a nutshell, good biological evidence showed that new species arise not in the large mainland populations (with their extensive gene mixing) but in small isolated populations with unusual gene frequencies (peripheral isolates), usually living separate (allopatric) from the mainland population. Once these allopatric populations were no longer isolated but remixed with the mainland population, they would be genetically and behaviorally distinct from their parent species. Thus, they would be no longer capable of interbreeding, which is part of the definition of a biological species.

Even though the allopatric speciation model was accepted by biologists as early as 1942, it took paleontologists 30 years to recognize its implications. In their historic 1972 paper, Niles and Steve pointed out that if you took Ernst Mayr’s allopatric speciation model seriously, it would predict that species should arise in a normal biological time frame: a few years to a few hundred years at most. That’s a geologic instant, the difference between one bedding plane and the next in strata that span millions of years. The allopatric speciation model also predicted that species should arise in small, peripherally isolated areas, so they were unlikely to be fossilized in the few places for which we have a good fossil record. Rather than slow gradual change through millions of years of strata (the “phyletic gradualism” model), the allopatric speciation model accepted by biologists should give a fossil record where species seem to appear suddenly without any gradual transition preserved (“punctuation”), and then persist for long periods of time without change (“equilibrium”).

The “punctuated equilibrium” paper is a masterpiece of writing and incisive thinking, which poses a number of interesting issues. The first part is a general discourse on the philosophy of science, which argues that all scientists are products of their time and culture and tend to see what they expect to see. In this context, Darwin led paleontologists to expect phyletic gradualism, which they vainly tried to document for over a century before the allopatric speciation model came along. Then Eldredge and Gould introduced the details of the allopatric model, described punctuated equilibrium, and give examples from their own research (phacopid trilobites from Eldredge, Bahamian land snails from Gould). Every time I teach a paleontology class, I always assign the original paper as required reading, and then lead a class discussion section teasing it apart. Like fine wine, the paper gets better every time I reread it. I’m always amazed at what insights it contains, what future debates it triggered or foreshadowed, and how different students pick up different elements when they read it for the first time.

For the first decade after the paper was published, it was the most controversial and hotly argued idea in all of paleontology. Soon the great debate among paleontologists boiled down to just a few central points, which Gould and Eldredge (1977) nicely summarized on the fifth anniversary of the paper’s release. The first major discovery was that stasis was much more prevalent in the fossil record than had been previously supposed. Many paleontologists came forward and pointed out that the geological literature was one vast monument to stasis, with relatively few cases where anyone had observed gradual evolution. If species didn’t appear suddenly in the fossil record and remain relatively unchanged, then biostratigraphy would never work—and yet almost two centuries of successful biostratigraphic correlations was evidence of just this kind of pattern. As Gould put it, it was the “dirty little secret” hidden in the paleontological closet. Most paleontologists were trained to focus on gradual evolution as the only pattern of interest, and ignored stasis as “not evolutionary change” and therefore uninteresting, to be overlooked or minimized. Once Eldredge and Gould had pointed out that stasis was equally important (“stasis is data” in Gould’s words), paleontologists all over the world saw that stasis was the general pattern, and that gradualism was rare—and that is still the consensus 40 years later.

The debate was less than a decade old when I was wrapping up my dissertation work in 1981. In my dissertation on the incredibly abundant and well preserved fossil mammals of the Big Badlands of the High Plains, I had over 160 well-dated, well-sampled lineages of mammals, so I could evaluate the relative frequency of gradualism versus stasis in an entire regional fauna. I also had a wide geographic spread (from Montana and Saskatchewan to Texas, but mostly in the Dakotas, Nebraska, Wyoming, and Colorado). I had large fossil samples of many species, with dozens at each level, and excellent stratigraphic data. When I finally plunged in and plotted and analyzed my data carefully, it was clear that nearly every lineage showed stasis, with one minor example of gradual size reduction in the little oreodont Miniochoerus. I could point to this data set and make the case for the prevalence of stasis without any criticism of bias in my sampling. More importantly, the fossil mammals showed no sign of responding to the biggest climate change of the past 50 million years (the Eocene-Oligocene transition, when glaciers appeared in Antarctica after 200 million years). In North America, dense forests gave way to open scrublands, crocodiles and pond turtles were replaced by land tortoises, and the snails changed from those typical of Nicaragua to those of Baja California. Yet out of all the 160 lineages of mammals in this time interval, there was virtually no response. To paraphrase Rhett Butler, “Frankly, my dear, the mammals don’t give a damn.”

This result intrigued me, so I began to re-examine the uncritical acceptance of the notion that fossil mammals track environmental changes. It occurred to me that our excellent database of North American fossil mammals and global climate change might be a good place to test this hypothesis. In a 1999 paper, I argued that for the four biggest independently documented periods of climatic change in the past 50 million years, the mammals either do not respond at all, or show much less speciation and extinction than they do at times when there is no evidence of climatic change. One interval included the middle-late Eocene climate change at 37 million years ago, when turnover was merely at background level, despite evidence of floral change elsewhere in North America, and a big climatic cooling event in the global oceans. The second was the Eocene-Oligocene transition just discussed. The third was the great expansion of modern grasslands at 7.5 million years ago, long after mammals with high-crowned grazing teeth appeared at 15 million years ago. In fact, there is almost no significant faunal change at 7.5 million years ago. The final example is the last 2 million years of ice ages, when climate changed dramatically, but speciation did not occur in response to climate. Instead, most ice age mammals simply migrated north and south in response to the movements of the ice sheets.

About six years ago, I decided to test this last idea. Back in 2006, I had a bunch of excellent students in my paleontology classes at both Occidental and Caltech, and several wanted to do research with me. I was at a loss over how to supervise so many undergraduates with limited backgrounds, until I realized that we could do a group of related projects practically in our back yard: the Page Museum at La Brea tar pits in Los Angeles. I equipped each one of them with calipers and gave them a measuring protocol, and got them access to the La Brea fossils through the collections managers. Then they each measured a different Ice Age mammal or bird, collecting data on hundreds of bones from all the tar pits with good radiocarbon dates: saber-toothed cats, dire wolves, giant lions, bison, horses, camels, ground sloths, plus the five most common birds: golden and bald eagles, condors, caracaras, and turkeys. After six years of work and publication, the conclusion is clear: none of the common Ice Age mammals and birds responded to any of the climate changes at La Brea in the last 35,000 years, even though the region went from dry chaparral to snowy piñon-juniper forests during the peak glacial 20,000 years ago, and then back to the modern chaparral again.

In four of the biggest climatic-vegetational events of the last 50 million years, the mammals and birds show no noticeable change in response to changing climates. No matter how many presentations I give where I show these data, no one (including myself) has a good explanation yet for such widespread stasis despite the obvious selective pressures of changing climate. Rather than answers, we have more questions—and that’s a good thing! Science advances when we discover what we don’t know, or we discover that simple answers we’d been following for years no longer work.

Clearly, it is an interesting time to be a paleontologist. As Gould (1983) put it, from the “irrelevance” of the early 1900s to the “subservient” role that George Gaylord Simpson placed us in 1944, paleontology is now in the driver’s seat, and trying to reach the “High Table” where the “High Priests” of evolution and genetics have long ruled unchallenged. Who knows where this will all end? Whatever the result, we’re clearly making advances by challenging the accepted dogmas of the time and finding their faults, and hopefully discovering something new and interesting. As Gould and Eldredge (1977) put it, “Why be a paleontologist if we are condemned only to verify what students of living organisms can propose directly?”

References

  • Eldredge, N. 1985. Time Frames: The Rethinking of Darwinian Evolution and the Theory of Punctuated Equilibria. Simon & Schuster, New York.
  • Eldredge, N. 1995. Reinventing Darwin: The Great Debate at the High Table of Evolutionary Theory. John Wiley & Sons, New York.
  • Eldredge, N., and S. J. Gould, 1972. Punctuated equilibria: an alternative to phyletic gradualism, pp. 82-115, in Schoft, T.J.M., Models in Paleobiology. Freeman Cooper, San Francisco.
  • Gould, S.J. 1980. Is a new and more general theory of evolution emerging? Paleobiology6: 119-130.
  • Gould, S.J. 1982. Darwinism and the expansion of evolutionary theory. Science 216:380-387.
  • Gould, S.J. 1983. Irrelevance, submission, and partnership: the changing roles of paleontology in Darwin’s three centennials, and a modest proposal for macroevolution, pp. 347-366, in Bendall, D.S. (ed.), Evolution from Molecules to Men. Cambridge University Press, Cambridge.
  • Gould, S.J. 2002. The Structure of Evolutionary Theory. Harvard University Press, Cambridge, Mass.
  • Gould, S.J., and Eldredge, N. 1977. Punctuated equilibria: the tempo and mode of evolution reconsidered. Paleobiology 3:115-151.
  • Prothero, D.R., 1992.  Punctuated equilibrium at twenty: a paleontological perspective.  Skeptic 1(3): 38-47.
  • Prothero, D.R. 1999. Does climatic change drive mammalian evolution? GSA Today   9(9):1-5.
  • Prothero, D.R., Syverson, V., Raymond, K.R., Madan, M., Molina, S., Fragomeni, A., DeSantis, S., Sutyagina, A., and Gage, G.L. (in press) Size and Shape Stasis in Late Pleistocene Mammals and Birds from Rancho La Brea during the last Glacial-Interglacial Cycle. Quaternary Science Reviews(in press)
  • Prothero, D.R., and T.H. Heaton, 1996, Faunal stability during the early Oligocene climatic crash.  Palaeogeography, Palaeoclimatology, Palaeoecology 127:239-256.
GD Star Rating
a WordPress rating system
Happy Darwin Day!, 4.7 out of 5 based on 3 ratings

Recommended Reading

11 Responses to “Happy Darwin Day!”

  1. Alan says:

    Your ‘full disclosure’ is a little ridiculous.

    Great article though, as usual.

  2. Evan says:

    Well-written and thought provoking as always, Don. Do these periods of paradoxical stasis also occur in the fossil record of plants? It seems that plants play a bit part or no part at all in the public discussion about evolution. I’d like to ask a creationist if Noah put one (or two if necessary) of every kind of plant on the Ark. Did you see anything about this at the Creationist museum you visited? Cheers.

    • Donald Prothero says:

      Yes, plants show lots of stasis, too. Hardly anyone mentions gradualism in paleobotany. Paleobotanists tend to be interested in different topics, like ancient environments and phylogenetic relationships, since plants are complicated (they hybridize easily).
      Nothing on plants at the Creation Museum except a weird painting of Genesis Day 3 showing a forest with extinct Pennsylvanian lycopods and sphenopsids side by side with modern flowering plants–the former were extinct LONG before flowering plants appeared (and the sun wasn’t created til Day 4, but they show it anyway). We grilled the guide about a lot of things, and at one point he began to bullshit about punctuated equillibria and quote Eldredge and Gould out of context and I nailed him on it.

  3. LovleAnjel says:

    I’ve always thought that behavioral adaptations would take the place of physical adaptations to some extent. Animals can get along fine eating all sorts of things not in their “natural diet”, and I suspect as the vegetation changed, they just figured out how to eat the new stuff. As it got cooler/warmer, as long as they were still within a certain range, they could adjust their behavior to compensate (huddling, spreading out, seeking out areas with more moderation, ect). Almost none of that would really fossilize, though…if they made a transition from a C3 to a C4 diet there could be a delta-C-13 signal in their bones. Changes in molar wear patterns? Changes in muscle scars to reflect heavier body weight?

    • Donald Prothero says:

      True, some animals CAN be flexible but not the entire fauna. There are specialists, like tapirs which are ALWAYS soft browsing leaf-eaters, that show no effect of the climate change, either. Yes, the C4 signal can be observed in both tooth enamel and bone, but there’s no response in the form of greater hypsodonty or even increased tooth wear.
      But the point of my post is that we’ve been sold this model where organisms are infinitely flexible and constantly adapt and change in response to environmental selection, like Galapagos finches–but it just doesn’t describe the geologic past

  4. Nicholas J. Matzke says:

    When climate shifts, don’t you see some *ecological* change in the composition of the flora and fauna? I guess you’ve already said this is the case for the flora. For the fauna, maybe large mammals aren’t very responsive, but I know there are various cases of small mammals changing their range between glacial periods and now etc…

    • Donald Prothero says:

      Nick: sometimes yes, but not in the case of the White River mammalian fauna–they marched right through the climate change with minimal faunal change. And several of your colleagues in the Barnosky/Hadly lab have published on the stability of Pleistocene mammal communities through the last 2 m.y. (McGill et al., 2005, for example). There is some shifting of geographic range but the communities are very stable.

  5. oldebabe says:

    Whew, that’s some article.

    • Donald Prothero says:

      I realize it was a bit technical, but a LOT of the readers of this blog are very scientifically sophisticated. (Actually, I wrote most of this for my 2009 trade book “Greenhouse of the Dinosaurs”.
      It’s a good thing to have blog posts about cutting-edge science once in a while, not just the tamed-down stuff that journalists feed us

  6. Tom says:

    So, maybe I’m a bit dense and unsophisticated here, but aren’t you saying: in the face severe environmental pressures (such as wild swings in the amount and nature of food sources over many millions of years) likely resulting in survival pressures and therefore at least micro evolution, there was none (stasis). Therefore, the evidence is not clear as to why micro evolution occurs, and certainly it is not clear as to why speciation occurs. We don’t have a good explanation as to why new species arise. When we do see significant change, it happens relatively quickly (punctuation), and the changes do not to occur as a response to environmental or survival pressures. You state that new species arise more often when there is no evidence of climate change (which I interpret to mean no evidence of survival pressures).

  7. Loren Petrich says:

    So according to PE, a species originates in a burst of evolution, and does not change very much after that. Any estimates on the scale of these bursts? What populations and how many generations?

    PE is sometimes called a theory of saltationism or “hopeful monsters”, meaning that a new species emerges in only one generation. That’s often been rejected, presumably because it seems like a rabbits-out-of-hats theory.

    How does molecular evolution fit in?

    The “neutral theory” is that much molecular-level evolution is driven by genetic drift. It seems contrary to PE, yet it’s well-supported, and one can sometimes infer a “molecular clock”. It sometimes seems like a revival of orthogenesis, but without the implication of goal-seeking. Does it only apply to selectively-neutral changes?

    Selectively non-neutral changes may be a different story. If one has homologous sequences from several species, one might be able to deduce patterns of whatever non-neutral changes may have happened.

    Molecular evolution runs a whole spectrum of change sizes: point mutations, insertions, deletions, gene duplications, lateral gene transfers, chromosome splits, fusions, duplications, and deletions, genome duplications (polyploidy), and lateral genome transfers (endosymbiosis). Could the larger changes be called saltationist?

    But I think that this molecular-level saltationism has a feature that has made it more accepted than traditional phenotypic saltationism: one can construct well-defined, testable hypotheses out of it. That makes it much less of a rabbits-out-of-hats theory.