Heavy metals, the result of contamination, may be toxic for animals to the extent of affecting their reproduction and physiology. This is the case with the great tit, a species of bird whose plumage colour is affected either negatively or positively depending on exposure to certain contaminating substances. Mercury, copper and chrome may cause the male great tit to be less attractive to the females.
Products labelled as organic are those which have been produced ecologically. A study by the University of Jaen concludes that the labelling favours products which are not considered to be of high quality, based on the analysis of olive oil.
Un estudio desarrollado por investigadores del Instituto de Biología Molecular y Celular de Plantas ha abierto una nueva vía para aumentar la longevidad de las semillas de las plantas mediante ingeniería genética. Sus resultados han sido publicados en la revista Plant Physiology.
The quality of cava depends on technical factors such as fermentation, ageing and bottling processes, which usually remain stable for years. Researchers from Malaga University (Spain) have discovered that oscillations in the North Atlantic –that affects European climate– also have an effect on the attributes of this sparkling wine. The years in which there is presence of the Azores anticyclone, there is a drop in the quality of cava.
Milk from organic farms has a lower concentration of elements like zinc, iodine and selenium than milk produced by conventional farming methods. The discrepancy is due to the absence of mineral substances in the diets of the cows reared. According to researchers, animals on organic farms should have their diets supplemented with natural sources of iodine such as seaweed, because it is a very important element for children and pregnant women.
Game has always been considered a scarce natural resource. For this reason, a team of researchers at the Polytechnic University of Madrid and the Centre for Forestry Research have carried out a study on these practices in the last 35 years which demonstrates that, despite the fact that the total number of hunters in Spain has fallen along with the number of open access territories, big game is on the rise.