Lose the farmers, lose the environment

Banaue Rice Terraces2 Further to Luigi’s thoughtful article on how hard farming is becoming, and how the skills needed to farm effectively are being lost as young people abandon rural life for the city, news that a farming environment often considered the eighth wonder of the world is under threat. The Banaue Rice Terraces of Luzon in the Philippines are beyond words. But they are apparently being destroyed by giant earthworms and edible snails, among other pests. But honestly, if the people are introducing snails to supplement their diet, how sustainable can the terraces possibly be? Only human labour can sustain such artifice, and only human need can command and coordinate that much labour. The President of the Philippine Senate has called for a “comprehensive study”. But what is it likely to recommend? That maintaining the terraces be a government-funded job to keep a tourist attraction in a state that will attract tourists, and their cash? Or can the communities that have inherited the Banaue terraces somehow be shown ways in which they can benefit directly from the tourist cash?

Photo from Wayfaring Travel Guide (because Flickr doesn’t work too well here in China.)

Starch and human diversity

Human diversity and agricultural biodiversity interact. The variation that exists between and within crops and livestock products in nutritional content is to some extent matched by — and indeed there is evidence that in some cases it has driven — genetic variation between and within the human populations that make use of them. We’ve blogged about this with regard to lactose intolerance and predisposition to iron deficiency. Now comes a study ((Perry, George H. et al. (2007) Diet and the evolution of human amylase gene copy number variation. Nature Genetics. http://dx.doi.org/10.1038/ng2123.)) linking variation among human populations in the number of copies of the amylase gene with the amount of starch in their diet ((I learned about it via a post in Carl Zimmer’s blog The Loom, in which he also talks about a couple of other cases of multiple copies of a gene building up in a genome.))

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More “contaminated” bison

The ancestors of the bison, or buffaloes, of Catalina Island off the California coast arrived as movie extras in 1924. Scientists have always thought they were more likely to be pure-bred than many of the other buffalo that roam North America, because they’ve effectively been in isolation. Turns out it ain’t so. Nearly half the animals shipped off the island have maternal cow genes. Scientists believe the cross breeding probably occurred before the buffalo were shipped to Catalina — and nothing since 1924 has selected against it.

P.S. As the commenter to our original piece pointed out, nobody seems to have looked for bison genes in cattle. Why not?