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33 result(s) for "Ammann, Klaus"
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Snowbeds are more affected than other subalpine–alpine plant communities by climate change in the Swiss Alps
While the upward shift of plant species has been observed on many alpine and nival summits, the reaction of the subalpine and lower alpine plant communities to the current warming and lower snow precipitation has been little investigated so far. To this aim, 63 old, exhaustive plant inventories, distributed along a subalpine–alpine elevation gradient of the Swiss Alps and covering different plant community types (acidic and calcareous grasslands; windy ridges; snowbeds), were revisited after 25–50 years. Old and recent inventories were compared in terms of species diversity with Simpson diversity and Bray–Curtis dissimilarity indices, and in terms of community composition with principal component analysis. Changes in ecological conditions were inferred from the ecological indicator values. The alpha‐diversity increased in every plant community, likely because of the arrival of new species. As observed on mountain summits, the new species led to a homogenization of community compositions. The grasslands were quite stable in terms of species composition, whatever the bedrock type. Indeed, the newly arrived species were part of the typical species pool of the colonized community. In contrast, snowbed communities showed pronounced vegetation changes and a clear shift toward dryer conditions and shorter snow cover, evidenced by their colonization by species from surrounding grasslands. Longer growing seasons allow alpine grassland species, which are taller and hence more competitive, to colonize the snowbeds. This study showed that subalpine–alpine plant communities reacted differently to the ongoing climate changes. Lower snow/rain ratio and longer growing seasons seem to have a higher impact than warming, at least on plant communities dependent on long snow cover. Consequently, they are the most vulnerable to climate change and their persistence in the near future is seriously threatened. Subalpine and alpine grasslands are more stable, and, until now, they do not seem to be affected by a warmer climate. Mountain regions are warming rapidly, and the upward shift of plant species has been observed on many alpine and nival summits. In this study, we address the following question: Are there observable changes also at lower elevations in the subalpine–alpine vegetation? Revisiting 67 old, exhaustive plant inventories in the Swiss Alps after 25–50 years, we show that the magnitude and direction of changes varied across the different plant communities: grasslands were quite stable in terms of plant community composition while snowbeds showed pronounced vegetation changes corresponding to the colonisation of species from surrounding grasslands.
Some Basis for a Renewed Regulation of Agri-Food Biotechnology in the EU
A radical reform of the agri-food biotech regulation in the EU is considered in many quarters (mostly by academia and industry) as a pressing necessity. Indeed, two important decisions (by the European Court of Justice and by the Commission) on the legal status of the so-called New Breeding Techniques are expected shortly. In order to clarify some basic aspects of the complex scenario, after a brief introduction regarding the “GMO” fallacy, we offer our point of view on the following facets: (1) A faulty approach is frequent in the discussion of the agri-food regulation; (2) NBTs, genome editing may lead to the disappearance of the “GMO” meme; (3) Beyond health and safety issues: socio-economic considerations; (4) Sustainability: the comprehensive, meaningful starting point of a positive reform; (5) The theoretical and legal basis for the reform are already contained in the EU’s general guidelines to legislation.
Comments on two recent publications on GM maize and Roundup
Two -omics studies on genetically modified maize and Roundup-fed rats, recently published in the journal Scientific Reports, contain serious flaws in the experimental design, methodology and interpretation of results, which we point out here. The use of -omics technologies are of increasing importance in research, however we argue for a cautious approach to the potential application in food safety assessments as these exceptionally sensitive and complex methods require a thorough and detailed evaluation of the biological significance of obtained results. Arising from: Mesnage et al . Sci Rep 7:39328 (2017), Mesnage et al . Sci Rep 6:37855 (2016).
Effects of biotechnology on biodiversity: herbicide-tolerant and insect-resistant GM crops
Biodiversity is threatened by agriculture as a whole, and particularly also by traditional methods of agriculture. Knowledge-based agriculture, including GM crops, can reduce this threat in the future. The introduction of no-tillage practices, which are beneficial for soil fertility, has been encouraged by the rapid spread of herbicide-tolerant soybeans in the USA. The replacement of pesticides through Bt crops is advantageous for the non-target insect fauna in test-fields. The results of the British Farm Scale experiment are discussed. Biodiversity differences can mainly be referred to as differences in herbicide application management.
A Plea for the Renewal of the ISBR
The recent meeting of the International Society for Biosafety Research (ISBR) focused on so-called genetically modified organisms. For decades, in most regulatory frameworks, recombinant DNA-modified organisms have been the wrong focus of unbalanced agri-food regulations. The ISBR should instead adopt a scientifically defensible and truly risk-based perspective, abandoning a misleading pseudo-category.
Confronting the Gordian knot
Galvanizing plant science in Europe will depend on an overhaul of the tangle of indefensible regulations themselves, not on the advent of new plant breeding technologies that may escape existing rules.
Is biotechnology a victim of anti-science bias in scientific journals?
Primarily outside the scientific community, misapprehensions and misinformation about recombinant DNA-modified (also known as ‘genetically modified’, or ‘GM’) plants have generated significant ‘pseudo-controversy’ over their safety that has resulted in unscientific and excessive regulation (with attendant inflated development costs) and disappointing progress. But pseudo-controversy and sensational claims have originated within the scientific community as well, and even scholarly journals’ treatment of the subject has been at times unscientific, one-sided and irresponsible. These shortcomings have helped to perpetuate ‘The Big Lie’ – that recombinant DNA technology applied to agriculture and food production is unproven, unsafe, untested, unregulated and unwanted. Those misconceptions, in turn, have given rise to unwarranted opposition and tortuous, distorted public policy.