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Extreme Algal Blooms: The New Normal?
http://carnegiescience.edu/news/extreme_algal_blooms_new_normal[font face=Serif][font size=5]Extreme Algal Blooms: The New Normal?[/font]
Monday, April 1, 2013
[font size=3]Washington, D.C.—A research team, led by Carnegie’s Anna Michalak, has determined that the 2011 record-breaking algal bloom in Lake Erie was triggered by long-term agricultural practices coupled with extreme precipitation, followed by weak lake circulation and warm temperatures. The team also predicts that, unless agricultural policies change, the lake will continue to experience extreme blooms. The research is published in the online early edition of the Proceedings of the National Academy of Sciences the week of April 1, 2013.
“The perfect storm of weather events and agricultural practices that occurred in 2011 is unfortunately consistent with ongoing trends, which means that more huge algal blooms can be expected in the future unless a scientifically guided management plan is implemented for the region,” remarked Michalak.
Fresh water algal blooms can result when excessive amounts of phosphorus and nitrogen are added to the water, typically as runoff from fertilized agriculture. These excess nutrients encourage unusual growth of algae and aquatic plants. When the plants and algae die, the decomposers that feed on them use up oxygen, which can drop to levels too low for aquatic life to thrive. In the beginning, the Lake Erie algae were almost entirely Microcytsis, an organism that produces a liver toxin and can cause skin irritation.
The scientists combined sampling and satellite-based observations of the lake with computer simulations. The bloom began in the western region in mid-July and covered an area of 230 square miles (600 km2). At its peak in October, the bloom had expanded to over 1930 square miles (5000 km2). Its peak intensity was over 3 times greater than any other bloom on record.
…[/font][/font]
http://dx.doi.org/10.1073/pnas.1216006110 (Doesn’t work yet.)
Monday, April 1, 2013
[font size=3]Washington, D.C.—A research team, led by Carnegie’s Anna Michalak, has determined that the 2011 record-breaking algal bloom in Lake Erie was triggered by long-term agricultural practices coupled with extreme precipitation, followed by weak lake circulation and warm temperatures. The team also predicts that, unless agricultural policies change, the lake will continue to experience extreme blooms. The research is published in the online early edition of the Proceedings of the National Academy of Sciences the week of April 1, 2013.
“The perfect storm of weather events and agricultural practices that occurred in 2011 is unfortunately consistent with ongoing trends, which means that more huge algal blooms can be expected in the future unless a scientifically guided management plan is implemented for the region,” remarked Michalak.
Fresh water algal blooms can result when excessive amounts of phosphorus and nitrogen are added to the water, typically as runoff from fertilized agriculture. These excess nutrients encourage unusual growth of algae and aquatic plants. When the plants and algae die, the decomposers that feed on them use up oxygen, which can drop to levels too low for aquatic life to thrive. In the beginning, the Lake Erie algae were almost entirely Microcytsis, an organism that produces a liver toxin and can cause skin irritation.
The scientists combined sampling and satellite-based observations of the lake with computer simulations. The bloom began in the western region in mid-July and covered an area of 230 square miles (600 km2). At its peak in October, the bloom had expanded to over 1930 square miles (5000 km2). Its peak intensity was over 3 times greater than any other bloom on record.
…[/font][/font]
http://www.pnas.org/content/early/2013/03/28/1216006110.abstract
