Date: 2 weeks ago   Category: Studies

Scientists have opened a secret of emergence of toxic seaweed in the lakes of America - RIA Novosti, 9/13/2017


Scientists have opened a secret of emergence of toxic seaweed in the lakes of America - RIA Novosti, 9/13/2017
MOSCOW, 13 Sep – RIA Novosti. Waters of Lake Erie and other Great Lakes of America become covered nearly an every year by seaweed and become poisonous for people because of the changes in circulation of phosphorus provoked by agriculture it is told in article published in the Canadian Journal of Fisheries and Aquatic Sciences edition. "Phosphoric fertilizers are a guarantee that the mankind can provide itself with that volume of food which is necessary for us for survival today. On the other hand, we almost know nothing about how long this phosphorus remains in lakes after there "washes away" it rains from fields" — Jason Venkiteswaran from Wilfrid Lorye's university in Waterloo (Canada) tells. © Photo: Kai Schumann/Noaarossiyskiye biologists have revealed a secret of "bloody inflows" on Baltiketsveteny waters cause the brown or blue-green seaweed living both in fresh lakes and reservoirs and in sea water. With an explosive growth of quantity of cyanobacteria and brown seaweed in water there are extensive spots which can pose a threat for human health and animals because of toxins which seaweed emit in water, clearing away themselves "vital space". It is considered that climate change and, in particular, growth of water temperature, will promote increase of cases of blossoming of seaweed and increase in the sizes of spots, however all climatic consequences from their emergence are still unknown. Venkiteswaran and his colleagues have opened one more main factor operating blossoming of plankton and subjects as long they will poison freshwater and sea reservoirs of Earth, trying to understand what forces Lake Erie and many other Great Lakes of North America to become covered by huge spots of seaweed nearly an every year. © Photo: NASA Earth Observatory images by Joshua Stevens, using Landsat data from the U.S. Geological Surveyopasnoye has seen blossoming of seaweed in the American Lake Erie спутникКак scientists explain, the main limiter of growth of seaweed in moderate and tropic latitudes usually are not the water temperature or number of sunny days, and how there is a lot of nitrogen and phosphorus contains in water of the lake, river or ocean. If there is a lot of one nutrient, and another isn't enough, then seaweed will begin to fight with each other for a "scarce" resource, emitting toxins. The main source of "excess" phosphorus and nitrogen is the person using a huge number of compounds of these substances for fertilizer of fields. A considerable part of these nutrients doesn't remain in water, and accumulates on day of lakes and rivers, and scientists were interested long ago whether there are they there forever or gradually filter into water. Having studied samples of water and the soil from a bottom about 70 different lakes in the territory of Canada, authors of article have found out that "leak" of phosphorus happens almost everywhere and that this process can go both very quickly, and very slowly. For example, phosphorus quickly disappears from small steppe lakes in the North and the East of the continent, and very slowly – from the Great Lakes. © Photo: NASA's Earth Observatoryuchenye

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