The conventional wisdom is that landraces and local breeds are better adapted to marginal conditions than modern crop varieties and livestock breeds. A paper has just been published in Agricultural Systems that tries to quantify this. The researchers defined marginal areas “as those areas where possible land uses are relatively limited because of higher altitude, shorter growing season, steeper slopes, less fertile soils or broadly speaking because of generally lower soil productivity.” They calculated a synthetic index of marginality using all kinds of environmental and socio-economic data and mapped its value throughout Europe. They also mapped the distribution of goat and sheep breeds using data from the Econogene project. Then they calculated how good the marginality index was at predicting the presence of local breeds. The result: “Increasing marginality, as measured by these indices, is positively and significantly correlated to the fact that local, traditional breeds are present.”