Recently many news outlets around the world carried the startling news that archaeologists had found the world’s oldest bread—as witnessed by this headline for a story by Helen Briggs published on 17 July 2018 in the BBC News:
Prehistoric bake-off: Scientists discover oldest evidence of bread
NPR carried a similar story by Lina Zeldovich on July 24th:
14,000-Year-Old Piece Of Bread Rewrites The History Of Baking And Farming
These stories brought to mind a spoof I had written back in the mid 1960s when I was in graduate school studying anthropology. I won’t discuss my motivation, but some may pick up on what was the source of my inspiration.
© 2018 John Edward Terrell. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. The statements and opinions expressed are those of the author(s) and do not constitute official statements or positions of the Editors and others associated with SCIENCE DIALOGUES.
AFTER YOU HAVE SENT to them a carefully collected sample of your spit or a used buccal swab along with your PayPal information, commercial DNA testing companies are likely to send back to you what they have found therein reported as your very own personal “ethnicity estimates“—usually expressed as percentages of this-and-that such as 43% West European, 18% Scandinavian, 6% Irish/Scottish/Welsh, 3% Finnish/ Russian, etc. all adding up to 100%.
If you go online to find out what on earth these percentages are telling you (for example, here) you are likely to get a great deal of misinformation.
Stay tuned to SCIENCE DIALOGUES for a penetrating critique of these pesky little percentages and the less than wonderful racial assumptions lurking within them.
On Teop Island, 1969
SOCIAL MEDIA IN GENERAL, and FACEBOOK in particular, have taken a lot of heat lately for a range of social and political misdeeds centering on, but not limited to, the misappropriation of the personal data of 87 million people.
I generally believe the seemingly trite wisdom that when given a lemon, you should make lemonade.
Back in 1969—or almost 50 years ago—while I was doing my dissertation field research in Pacific archaeology on Bougainville Island in the North Solomons, I lived for a number of months on beautiful little Teop Island just off the northeast corner of Bougainville, one of the largest islands in the Southwest Pacific.
Several months ago I discovered that lots of people from Teop are now on FACEBOOK. It turns out some people there even remember me and where the house was I lived in (it is no longer there). Some may remember, too, the clan name I was given back then.
I started “friending” folks there, and vice versa. Then I began posting my old pictures of people and events on the island to local applause.
Several of us at Field Museum in Chicago are now working remotely via email and FACEBOOK with Geoffrey Purupuru and others from Teop to create a forum at our website PacificAnthropology.org where all of my photos from Teop back in 1969 can be seen, commented on, and freely shared with others.
An unexpected way of “returning” that would only be possible today. Thanks be to FACEBOOK.
But more to the point I want to end with here, we see this collaborative venture as further demonstration of how museums today can form partnerships with communities beyond their walls to celebrate world cultural heritage, And share old memories, too.
Text updated: 6.26.2018
A sample of the photos soon to be available on the Internet.
June 2, 2018
AS NOTED EARLIER THIS WEEK at SCIENCE DIALOGUES, the popular science monthly Scientific American has now published a lengthy and decidedly critical commentary on current practice in the new field of paleogenetics .
At present it looks like the hype promoting paleogenetics research far exceeds the actual performance.
But who knows what the future will bring once human geneticists realize that there are no simple ways to connect the dots between human genes and the realities of human history.
Beckett Sterner, Arizona State University, and Scott Lidgard, Field Museum of Natural History, have written a new interpretation of a critical period in evolutionary biology leading to how scientists classify organisms: the “Systematics Wars” of the late 1960’s through the 1980’s.
This was a time when prominent biological systematists fought bitterly along partisan lines. They critique philosopher David Hull’s historical account in Science as a Process, which began what later became the common view that one camp, cladistics, straightforwardly “won” over another camp, phenetics.
Hull prioritized theory over practice and the conflicts of a few leading theorists over the less polarized interactions of systematists at large. He treated cultural evolution and biological evolution as forms of the same general process; cladistics and phenetics as holistically opposed theories can only interact by competition to the death.
Sterner and Lidgard instead analyze what systematists actually did in this period, the workflow that they followed, the methods they used, and the common problems that arose and were solved to the benefit of both camps.
They hope this opens a new window of different perspectives on how we classify organisms—the mathematization of systematics.
© 2017 John Edward Terrell. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. The statements and opinions expressed are those of the author(s) and do not constitute official statements or positions of the Editors and others associated with SCIENCE DIALOGUES.
Nature human behavior has just published a research highlight written John Carson about work at the Sibilo School Road Site in Kenya done by Nick Blegen, Harvard University, that has recovered large quantities of obsidian along with Middle Stone Age (MSA) tools . The finds are thought to date back at least ∼200 kyr.
As Carson summarizes: “Geochemical analyses demonstrated that the majority of obsidian pieces had their provenance at a source site >160 km away, indicating long-distance transport of raw materials during the MSA.” Previously, East African sites evidencing long-distance resource transport have all be less than <50 kyr old.
Evidently known MSA sites of this age are rare in East Africa. If more sites can be found and excavated, the “big story” usually told about the evolution of human social behavior may need updating: far-reaching resource networks and/or intergroup trade in raw materials could have developed earlier than generally believed in the history of our species. If so, then in Carson’s words: “we may gain greater insight into the timeline of social evolution that eventually led to our modern group behaviours.”
Blegen’s report was just published (unfortunately behind a paywall) in the Journal of Human Evolution. Here is the abstract you will find available there for free:
© 2016 Elsevier Ltd. All rights reserved
Please note: this news story, recovered on 28-Jan-2017, was originally published in Science Dialogues on 27-August-2014.
Associate Curator Ken Angielczyk of The Field Museum was part of an international team of collaborators that conducted paleontological fieldwork in Zambia between June 22 and July 31. Ken and his collaborators focused on Middle Permian (~265 Mya) to Middle Triassic (~240 Mya) rocks in two areas of the country, the Zambezi Basin in southern Zambia and the Luangwa Basin in northeastern Zambia. The team had done preliminary work in the Zambezi Basin in 2011 and 2012, but only spent a total of about 5 days working there. This time, they spent about two weeks there and their discoveries include multiple species of archaic amphibians and dinocephalians and dicynodonts (both ancient mammal relatives) from the Middle Permian, extremely well preserved fossil wood, and evidence that two temporally-distinct faunas are preserved in the Permian rocks in the Zambezi Basin. They also collected a large amount of geological data that will help complete the picture of the environments in which the plants and animals were living.
The team had conducted more extensive fieldwork in the Luangwa Basin in 2009 and 2011, and this year their work focused on rounding out their previous collections and collecting more geological data to understand paleoenvironments. Among their discoveries is evidence of strong associations of particular dicynodonts with specific environments in the Late Permian rocks of the Luangwa Basin, and strong evidence of increased aridity and changes in the nature of river systems in the area moving from the Late Permian to the Middle Triassic. Ken and his collaborators will use these data to investigate the role environmental changes played in shaping the end-Permian mass extinction (the largest extinction in Earth history) and the recovery following the event.
And one important result of fieldwork like that: scientific publications. Ken and colleagues have a paper in the July issue of Journal of Vertebrate Paleontology describing fossils of tapinocephalids from Southern Zambia. Tapinocephalids are hippo-sized, herbivorous mammal relatives that lived about 265 million years ago; the fossils were discovered by Ken and his collaborators during short exploratory trips to the Zambezi Basin in southern Zambia in 2011 and 2012. They are the oldest known tetrapod remains from Zambia, and demonstrated the potential of the area for further paleontological exploration (as in previous item). This is also the second time that Ken and his teammates have discovered tapinocephalids in an area from which they were previously unknown (the first time was in 2008 in Tanzania).
© 2014 Mark Alvey. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. The statements and opinions expressed are those of the author(s) and do not constitute official statements or positions of the Editors and others associated with SCIENCE DIALOGUES
Please note: this news story, recovered on 28-Jan-2017, was originally published in Science Dialogues on 5-Sept-2014.
A team from the University of Chicago, The Field Museum, and the University of Minnesota has been working for three years on a topic that has long confounded avian biogeographers: the origins and evolution of bird migration. In the August 19 issue of Proceedings of the National Academy of Sciences the team—U of C Ph.D. student Ben Winger, FMNH Associate Curator Rick Ree, and Minnesota prof Keith Barker—published a paper aimed at resolving that question for one of the largest groups of migratory birds.
Traditionally, there have been two schools of thought on where migration began and how it evolved: one theory proposed that ancestors of migratory birds spent the whole year in temperate regions, and that migration patterns evolved over time as these birds’ winter ranges gradually moved to the tropics. The other theory held that these ancestors were originally found in the tropics, with breeding grounds shifting to more temperate locales like North America.
To solve this riddle of migration the team used an innovative phylogenetic model designed to infer the historical biogeography of migratory birds. Ben and Rick developed this new model based on an existing biogeographic method that Rick developed called the “dispersal-extinction-cladogenesis” model, which has been widely used by biogeographers. They applied the model to New World “emberizoid” songbirds, a large group of migratory birds that include warblers, cardinals, sparrows, tanagers, and orioles, using a comprehensive phylogenetic tree developed by Keith and a group of colleagues. “We named it the ‘domino model’ because the breeding and winter ranges of species were coded in 3×2 grids of binary values, like dots on domino pieces,” Rick explains. “The computational challenge was to reconstruct the most probable evolutionary shifts from one domino to another.” Examining common ancestors of migratory and non-migratory species over time using the phylogenetic data, the team concluded that there was more evidence supporting the idea that birds lived year-round in North America and began migrating further and further south, resulting in today’s birds migrating thousands of miles every year.
Another result of the study suggests that many tropical species of birds are descendants of migratory ancestors that lost migration and stayed in the tropics year-round. “This is an interesting result because species diversity in this group is much higher in the tropics,” notes Ben. “Previously, more species in the tropics led to the assumption that temperate, migratory species are derived from tropical, non-migratory ancestors; however, the results of our phylogenetic study suggest that the opposite pattern happened often in this group.”
This study received nice coverage by National Geographic, among other outlets, and will soon be featured on the Field’s Science Newsflash web feature.
So what’s that about botanist and birders joining forces? Well, Ben and Keith are ornithologists, and Rick is a botanist, but with deep experience in biogeography and genomics, which he has applied beyond plants (e.g., butterflies, Amazonian amphibians, lichens). Natural history museums are places where scientists in nominally different fields, but with congruent interests—like biogeography and genomics—can cross paths, and disciplines. Which is one of the things that makes them particularly fascinating places to work.
Here’s the full citation for the article: Benjamin M. Winger, F. Keith Barker, and Richard H. Ree. Temperate origins of long-distance seasonal migration in New World songbirds. PNAS, August 4, 2014 DOI: 10.1073/pnas.1405000111
© 2014 Mark Alvey. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. The statements and opinions expressed are those of the author(s) and do not constitute official statements or positions of the Editors and others associated with SCIENCE DIALOGUES.
While using network theory and visualization techniques to map the genetic structure of species in space and time is in its infancy, reconfiguring how science grapples with the inherent complexity of evolution as an ever unfolding process using network approaches has the promise of making it easier to explore how comparable or dissimilar species are in their strategies for survival and reproduction. Looking long and hard at what other species do to survive and reproduce may also make it easier for all of us to see just how toxic our own social strategies—and the assumptions supporting them—can be.