Category: GIS

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Magnolias in trouble

The Global Trees Campaign says that 131 of 245 wild Magnoliaceae are threatened worldwide. According to this press release from BGCI:

The significance of this potentially catastrophic loss lies not only in the threat to the genetic diversity of the family, but also because they are a highly sensitive indicator of the well-being of the forests in which they are found. Magnolias are among the most ancient groups of flowering plants and have long been cultivated by mankind.

You can download a PDF of the new Magnoliaceae Red List. The publication of the red list has been widely covered by the press, including New Scientist. Many species have medicinal uses and some are used for food.

Predictably, protected areas are highlighted as an important approach to the conservation of these species, particularly in their hotspot in southern China. A separate new study

concludes that protected areas are necessary for preventing the loss of species due to climate change – provided that shifts in species’ ranges are factored into early analysis of whether to expand current protected areas or create new ones.

The new red list includes distribution maps of all magnolias, clearly an important first step.

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Mexico atlas

If you’ve been reading this blog for any length of time you’ll know I have a thing about agricultural atlases. Well, here’s another one. Mexico’s Instituto de Geografia has put its Atlas Nacional de Mexico online, and it includes maps of crop production such as these (dating back to 1989, though). However, these are just high definition scans rather than real digital maps, which makes them slow to load and difficult to use. But beautiful to look at.

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Cool cartograms

Cartograms are maps where the sizes of territories (countries, say) are proportional not to the surface area of their real-world counterparts, but rather to the value of some other attribute, like population or GDP or incidence of malaria. You can see lots of really wonderful examples on the Worldmapper website. That includes a few agricultural variables and some forestry stuff. Here’s an example of the former, net imports of vegetables by $ value.

As I said earlier in connection with Gapminder, wouldn’t it be great to be able to produce cartograms from FAOSTAT data? Or what about from the data in SINGER? Well actually that shouldn’t be all that difficult, the code for making your own cartograms is available, according to Worldmapper’s FAQ. Any volunteers?

Cartogram © Copyright 2006 SASI Group (University of Sheffield) and Mark Newman (University of Michigan), reproduced by permission. Worldmapper is at: www.worldmapper.org

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Syrian agricultural stats

You may remember a post some time back on an atlas of agriculture in Bhutan. Now here’s an on-line database of governorate-level agricultural statistics for Syria. Maybe not as nice as an atlas, but still pretty useful for planning agricultural biodiversity conservation. Especially as there is time-series data going back to 1985, which could be used to identify areas of genetic erosion through the (admittedly imperfect) proxy of decreasing total acreage. But when will agricultural statisticians and census-takers start collecting data on numbers of varieties, at least of staple crops?