Author: Luigi Guarino

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Feral livestock: pest or useful resource?

I ((Contributed by Michael Kubisch)) came across an interesting article while browsing through my archives. ((Dirk van Vuren and Philip W. Hedrick. Genetic Conservation in Feral Populations of Livestock. Conservation Biology, Vol. 3, No. 3. (Sep., 1989), pp. 312-317.)) It is by now quite dated, but with global climate changes upon us, I think it may actually be more relevant now than it was 20 years ago. The article makes a case for the preservation of feral livestock which are descendents of animals that, once kept by humans, either manage to escape into the wild or are simply abandoned when no longer useful.

Not all species do this equally well. Sheep have a hard time managing on their own, while pigs, on the other hand, easily adapt to all sorts of environments. In the US there are an estimated 4 million feral pigs, many of which may be descendents of pigs brought over by the Spanish in the 16th century. Similarly successful have been feral horses in the US and camels in Australia, the latter being so abundant that there are efforts underway to use them for meat production.

The article makes the case for preserving feral livestock as a valuable genetic resource because the adaptation to life in the wild may have favored or preserved traits, for example resistance to specific parasites or a higher temperature tolerance, that domestic livestock may have lost.

Of course, there are drawbacks: in some countries feral animals are considered pests and there is no doubt that particularly pigs can and do inflict serious damage on the environment. And because of this there are often programs in place to eradicate or at least control feral populations, although such attempts have not always been all that successful. At any rate, in an age of changing climate conditions it might perhaps be more worthwhile to keep some feral livestock around than to try to get rid of it. 

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World Bank protects biodiversity

The International Finance Corporation (IFC) is the private sector arm of the World Bank. It “provides loans, equity, structured finance and risk management products, and advisory services to build the private sector in developing countries.” It has just launched, with support from the Global Environment Facility, a Biodiversity and Agricultural Commodities Program which will “seek to reduce … threats (to global biodiversity) by leveraging market forces at all levels of the value chain (of palm oil, cacao, soybeans, and sugarcane).”

The program will offer advisory services for projects involving the private sector that support adoption of better management practices at the production level, increase the demand for biodiversity-friendly products, and improve financial institutions’ ability to support adoption of biodiversity-friendly practices. The program will also support multistakeholder initiatives that create sustainable markets for agricultural commodities.

I just hope some of those “better management practices at the production level” include the conservation and deployment of agricultural biodiversity in farmers’ fields.

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Down memory lane

I suppose if you blog long enough eventually you’ll end up re-visiting old stories. That happened quite a lot today.

First, there was a post I wrote a few months back about how mesquite — a useful source of food and other products in some places — is proving a nuisance in northern Kenya. Well, according to a story out today in the East African Standard, the government has been taken to court over the introduction of the plant, but is shifting the blame to FAO.

Then, you may recall a couple of posts about Brazil nuts and more generally nuts in Brazil. Today I ran across a paper ((Karen A. Kainer, Lucia H.O. Wadt and Christina L. Staudhammer. Explaining variation in Brazil nut fruit production. Forest Ecology and Management, 2007.)) which followed fruit production in 140 Brazil nut trees over 5 years. ((Clicking where it says map below this post will take you to where the Brazilian researchers work: Rio Branco, Acre)) What struck me was that there was significant variation in fruit production from year to year for individual trees, but that some trees are consistently high producers. I don’t know if there’s a Brazil nut improvement programme, but if there is it should definitely know about those! There are also management practices that are likely to increase production, such as cutting lianas and adding P.

Third, an editorial and article in Nature about the use of systems biology ((“The study of the interactions between proteins, genes, metabolites and components of cells or organisms”)) to evaluate traditional Chinese medicines reminded me that I’d written on that subject too. What is fascinating about Chinese traditional medicine is that it is based on diversity: it doesn’t deal in single chemicals taken singly, but rather in often incredibly complex combinations of a myriad plant and other products. A particular species will often play quite different roles in different formulae aimed at different symptoms.

Finally, I mentioned about a month back a piece of work ((Eric Giraud et al. Legume Symbioses: Absence of Nod Genes in Photosynthetic Bradyrhizobia. Science, 2007)) on an often overlooked but very important subset of agricultural biodiversity — microsymbionts. A longish article yesterday in EurekaAlert on the same work (I don’t know why the delay) made me realize I had been excessively cursory at the time of my original post. The researchers have identified a totally new genetic mechanism controlling the way nodulation happens, which opens up the possibility of interesting agricultural applications.

One of the things this little flurry of retrospection has done is alert me to the fact that some of the links in older posts may now be broken, for example because after a certain period of time the piece gets put into an archive behind a paywall. Not sure what we can do about that, though.