{"id":10516,"date":"2013-04-25T08:08:32","date_gmt":"2013-04-25T12:08:32","guid":{"rendered":"http:\/\/www.fondriest.com\/news\/?p=10516"},"modified":"2021-11-10T16:45:37","modified_gmt":"2021-11-10T20:45:37","slug":"record-lake-erie-algal-bloom-possible","status":"publish","type":"post","link":"https:\/\/www.fondriest.com\/news\/record-lake-erie-algal-bloom-possible.htm","title":{"rendered":"Another record Lake Erie algal bloom possible; study cites solutions"},"content":{"rendered":"

Vast, toxic seasonal algal blooms may become commonplace on Lake Erie if agricultural practices don\u2019t change soon, according to a recent study on the causes of a 2011 record breaking algal bloom.<\/p>\n

The good news is there is a calculated threshold for nutrient runoff that, if met, should reduce the likelihood for more blooms.<\/p>\n

If farmers, citizens and waste water treatment facilities can collectively reduce their runoff to 1,000 metric tons or less phosphorus, large harmful algal blooms should be much less prevalent.<\/p>\n

\u201cTo meet that target the people on the land have to do their part, whether it\u2019s changing agricultural practices, sewage treatment upgrades or how they fertilize their own lawns,\u201d said Justin Chaffin, research coordinator at the Ohio State University\u2019s Stone Laboratory and contributor to the study.<\/p>\n

Shallow phosphorus deposition in soil, heavy spring rains and stagnant summer weather brought the 2011 bloom to life. It flourished, by October covering 5,000 square kilometers, or an area three times the size of the previous record.<\/p>\n

The algae\u2019s main source of food came from the Maumee Bay, near Toledo. \u00a0Phosphorus washed into the lake mostly from large agricultural operations pushing to deliver soybeans and corn to market. \u00a0Sewage overflows and home yard fertilizer also contributed to the nutrient loading.<\/p>\n

Chaffin said calm hot summer weather didn\u2019t help the situation. \u201cAll that spring (season) water that had phosphorus entered the Maumee Bay and just sat there,\u201d he said.<\/p>\n

With more than 2,000 metric tons of phosphorus in the mix and little wind to disturb algae floating on the surface, the lake became an incubator for cyanobacteria.<\/p>\n

Residents on shore soon saw the results. A 10-centimeter-thick fluorescent green scum covered much of the lake\u2019s western basin.<\/p>\n

\"The

The 2011 Lake Erie algal bloom covered much of the lake’s western basin (Credit: NASA)<\/p><\/div>\n

The larger problem, the study authors found, is that a bloom of this scale will likely happen again.<\/p>\n

Nationally, the study reports, corn production increased by 11 percent from 2008 to 2011. Corn requires more nutrients than soybeans for good yields, which may have contributed to the record bloom.<\/p>\n

The study authors cited fertilizing practices as the larger culprit for a 218 percent increase in nutrient loading through Maumee Bay seen from 1995 through 2011. \u00a0It\u2019s common to fertilize only a field\u2019s top layer without tilling it into deeper into the soil. \u00a0The method saves time and effort for farmers, but it also leads to much easier runoff of nutrients.<\/p>\n

Weather monitoring from buoy stations on the lake and satellite observations showed conditions were ideal for the bloom. \u00a0Powerful rain storms washed nutrients into the bay, strong winds stratified the water and calm conditions incubated microcystis. According to study authors, these conditions are not unusual on the lake.<\/p>\n

Despite bleak predictions, Chaffin said the problem is fixable.<\/p>\n

In the 1960s and 1970s, harmful algal blooms were a big problem in Lake Erie. \u201cThe problem was the same, but the source of phosphorus was different,\u201d Chaffin said.<\/p>\n

The biggest contributor was raw sewage running into the lake and feeding algae. \u00a0Municipalities worked to improve water treatment, which reduced the preponderance of blooms.<\/p>\n

Chaffin said if farmers and citizens can work to mitigate fertilizer runoff, they can solve the new algal bloom issue in Lake Erie.<\/p>\n

During 2011, the lake took in 2,400 metric tons of phosphorus, more than double the threshold goal. Chaffin said that number shouldn\u2019t dissuade people. \u201cIf you look at the average over the past five or six years, (the threshold is) only a 35 percent reduction in phosphorus loading,\u201d he said.<\/p>\n

Several representatives of Ohio\u2019s agricultural industry stated that reducing nutrient runoff to improve water quality was important to them in comments to Ohio Governor John Kasich\u2019s proposed regulation of nutrient application.<\/p>\n

Harmful algal blooms produce toxic microcystin, which can kill wildlife and even poison people that drink or contact the water.<\/p>\n

The study was published in the Proceedings of the National Academy of Sciences in April. Its two-dozen authors come from a mix of universities, government and industry.<\/p>\n

Top image: Algae-tainted water splashes on the beach at East Harbor State Park,\u00a0Ottawa County, Ohio (Credit: Brenda Culler \/ Ohio Department of Natural Resources)<\/span><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

A study of Lake Erie’s recent record bloom finds the causes are likely to repeat, but an attainable cut in nutrient loading could help.<\/p>\n","protected":false},"author":10,"featured_media":10518,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[308,91,60,346,342,343],"class_list":["post-10516","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lakes-reservoirs","tag-algae","tag-buoy","tag-featured","tag-lakes-reservoirs","tag-ohio-state-university","tag-stone-lab"],"remote_post_permalink":false,"remote_post_featured_image":false,"yoast_head":"\nAnother Record Lake Erie Algal Bloom Possible<\/title>\n<meta name=\"description\" content=\"A study finds the causes of the record 2011 Lake Erie algal bloom are likely to happen again, but also names a threshold goal for nutrient loading.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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