A DNA study of almost a thousand wild and domestic cats from around the world is helping to unravel the evolutionary history of this most numerous of household pets. There are five wild subspecies of nearest-relatives, including one in the Near East, from which all domesticated cats are derived, though there has been subsequent hybridization of house cats with local wild populations here and there. Modern cat breeds can trace their origin to at least five mothers domesticated in the Fertile Crescent around the same time as agriculture started, over 9,000 years ago. And, coincidentally, there’s news also today of archaeological evidence from nearby Cyprus backing up that date.
Climate change and agriculture
A press release from the Smithsonian Institute draws attention to a study that links climate change, culture and agriculture. Mexico’s Central Balsas Valley is believed to be one of the sites where farmers domesticated maize and squashes. The new data suggest that the climate in the valley became cooler and drier at the end of the most recent ice age. Lakes in the valley formed at around that time and became magnets for human settlements, which contain evidence of maize and squash pollen. Of course, we’re not saying that climate change is always a good thing …
Pollo y kumara
Chickens crossed to South America from Polynesia, while sweet potatoes went the other way, who knows, maybe in the same canoes. Ok, let’s unpack that a little bit. A DNA study has found links between 14th century (i.e. pre-Columbian) chicken bones buried on the coast of south central Chile and chicken bones from Polynesian archaeological sites, particularly on Tonga and American Samoa. Meanwhile, ocean circulation models suggest that, contrary to previous thinking, a ship setting off from various points along the western coast of South America could indeed have delivered sweet potato seed pods (and bottle gourds?) to Polynesia (in particular the Marquesas) in a relatively short period. These studies have been all over the news lately and are being much discussed in the blogosphere. For example, Gene Expression and John Hawks work through some of the anthropological questions.
Ancient genebank dug up?
Is it possible to trace an intellectual connection from Roman horti to the medieval and renaissance physic garden to colonial botanic gardens such as Kew to the modern genebank? Possibly. If so, news of an archaeological discovery not far from where I’m sitting will be of importance to all who take an interest in agricultural biodiversity.
Archaeology of food
Speaking of conferences, there’s another one that’s worth keeping an eye on, which I learned about via Eurekalert. It’s called Food and Drink in Archaeology 2007 and will feature a keynote address by Professor Martin Jones of the Department of Archaeology, University of Cambridge entitled “Feast: Why Humans Share Food.”
Why is this relevant to us here at the Agricultural Biodiversity Weblog? Well…
Whilst the importance of nutrition for survival has long been recognised, recent studies have increasingly stressed the cultural significance of the production, distribution and consumption of foodstuffs through out all archaeological periods. An understanding of diet in past societies is therefore crucial to an understanding of daily life, and the relationships between different classes and societies throughout the world.