  {"id":27856,"date":"2023-07-25T15:37:34","date_gmt":"2023-07-25T19:37:34","guid":{"rendered":"https:\/\/www.yorku.ca\/science\/?p=27856"},"modified":"2023-07-25T15:40:06","modified_gmt":"2023-07-25T19:40:06","slug":"more-algal-blooms-likely-in-lake-erie-as-deep-water-oxygen-levels-continue-to-drop","status":"publish","type":"post","link":"https:\/\/www.yorku.ca\/science\/2023\/07\/25\/more-algal-blooms-likely-in-lake-erie-as-deep-water-oxygen-levels-continue-to-drop\/","title":{"rendered":"More algal blooms likely in Lake Erie as deep-water oxygen levels continue to drop"},"content":{"rendered":"\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><a href=\"https:\/\/www.yorku.ca\/news\/2023\/07\/25\/more-algal-blooms-likely-in-lake-erie-as-deep-water-oxygen-levels-continue-to-drop\/\" target=\"_blank\" rel=\"noreferrer noopener\">Media release from July 25, 2023<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">快播视频 researchers take novel approach to look at history of deep-water oxygen in Lake Erie through insect larvae in lake sediment over last 150 years.<\/h2>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignleft size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.yorku.ca\/science\/wp-content\/uploads\/sites\/31\/2023\/07\/box-corer-RSV-Lake-Guardian_ER-1-683x1024-1.jpg\" alt=\"Retrieval of the box corer containing Lake Erie sediments\" class=\"wp-image-27859\" width=\"247\" height=\"370\" srcset=\"https:\/\/www.yorku.ca\/science\/wp-content\/uploads\/sites\/31\/2023\/07\/box-corer-RSV-Lake-Guardian_ER-1-683x1024-1.jpg 683w, https:\/\/www.yorku.ca\/science\/wp-content\/uploads\/sites\/31\/2023\/07\/box-corer-RSV-Lake-Guardian_ER-1-683x1024-1-200x300.jpg 200w\" sizes=\"auto, (max-width: 247px) 100vw, 247px\" \/><figcaption>Retrieval of the box corer containing Lake Erie sediments, from which the sediment cores were retrieved for this study, aboard the Research Vessel (R\/V) Lake Guardian, which is owned by the United States Environmental Protection Agency (US EPA). The R\/V Lake Guardian is the largest research vessel in its fleet and conducts environmental monitoring across all five Great Lakes. Photo courtesy of Dr Euan Reavie<\/figcaption><\/figure><\/div>\n\n\n\n<p>Researchers at 快播视频 went searching for the fossilized remains of small insect larvae called chironomids, found in sediment in Lake Erie, to find a history of deep water oxygen deprivation in the lake that continues today.<\/p>\n\n\n\n<p>\u201cOur results indicate that Lake Erie has suffered declines and depletion of bottom oxygen in the past, including prior to major Euro-American settlements, however, it wasn\u2019t as bad as it is today,\u201d says senior author and Associate Professor <a href=\"https:\/\/www.yorku.ca\/science\/lab\/rquinlan\/\" target=\"_blank\" rel=\"noreferrer noopener\">Roberto Quinlan<\/a>. If oxygen continues to decrease, Lake Erie will likely see more algal blooms occurring in the future.<\/p>\n\n\n\n<p>Until now, understanding the oxygen dynamics in Lake Erie was more speculative. The current research, led by former York grad student Dmitri Perlov, is novel in that it looked at how an organism, such as chironomid larvae, which is highly sensitive to changing oxygen levels, was affected over the past 150 years.<\/p>\n\n\n\n<p>The researchers studied the presence of these tiny larvae, which metamorphosize into midges as adults, in lake sediment cores from today to before pre-industrial times. They found oxygen depletion rates ramped up as populations increased and agriculture intensified after industrialization in the 1950s, which was likely exacerbated by the development and increased use of phosphorus-rich chemical fertilizers and household detergents. It was particularly bad in the 1960s and 70s. Water clarity started to improve in the 80s and 90s following phosphorus abatement programs initiated in the early 1970s, but oxygen levels have not recovered.<\/p>\n\n\n\n<p>Poor water quality has a lot to do with the lack of deep-water oxygen, which can spur summer algal blooms that can affect the drinking water for millions of people around Lake Erie, and it also means that when there is a temperature inversion, which sends deep waters devoid of oxygen to the surface, it can cause a massive kill-off of fish, that can have major effects on commercial fishing.<\/p>\n\n\n\n<p>\u201cOf all the Great Lakes, Lake Erie is the most stressed by human influence and has the poorest water quality so it is of great interest to both the United States and Canadian federal governments, and all the state and provincial governments that border the Great Lakes,\u201d says Quinlan of 快播视频\u2019s Faculty of Science.<\/p>\n\n\n\n<p>Low oxygen levels at the bottom of the lake can produce a chemical environment where phosphorus, a primary nutrient for algae, is released from the sediments.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.yorku.ca\/science\/wp-content\/uploads\/sites\/31\/2023\/07\/microscope-workstation_DP-1024x576-1.jpg\" alt=\"View of a microscope workstation\" class=\"wp-image-27857\" width=\"452\" height=\"254\" srcset=\"https:\/\/www.yorku.ca\/science\/wp-content\/uploads\/sites\/31\/2023\/07\/microscope-workstation_DP-1024x576-1.jpg 1024w, https:\/\/www.yorku.ca\/science\/wp-content\/uploads\/sites\/31\/2023\/07\/microscope-workstation_DP-1024x576-1-300x169.jpg 300w\" sizes=\"auto, (max-width: 452px) 100vw, 452px\" \/><figcaption>View of a microscope workstation, with compound scope and associated micoscope digital camera, computer and monitor to view specimens for identification from published identification guides. Photo courtesy of Dmitri Perlov<\/figcaption><\/figure><\/div>\n\n\n\n<p>\u201cA central pillar of water quality research is trying to control phosphorus. If you get a lake that loses its oxygen and all of this stored phosphorus is released from the sediments, all of these efforts by governments and society to control phosphorus, it\u2019s all undone by this chemical process that releases a huge amount of phosphorus back into the water and fuels algal blooms,\u201d says Quinlan.<\/p>\n\n\n\n<p>This creates conditions for algal blooms, including harmful cyanobacterial blooms, which turns the water blue-green, makes it smell and taste bad, and can be toxic to humans, pets and livestock, making tap water unsafe to drink.<\/p>\n\n\n\n<p>\u201cOur study\u2019s results emphasize the vulnerability of Lake Erie to low oxygen because it naturally had periods of low oxygen prior to large scale European settlement, urbanization, industrialization, agricultural fertilizers and all these additional stressors that make Lake Erie that much more vulnerable to low oxygen,\u201d says Quinlan.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignleft size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.yorku.ca\/science\/wp-content\/uploads\/sites\/31\/2023\/07\/microscope-view-Tanytarsini_DP-768x1024-1.jpg\" alt=\"Microscope view of a subfossil chironomid head capsule.\" class=\"wp-image-27861\" width=\"201\" height=\"268\" srcset=\"https:\/\/www.yorku.ca\/science\/wp-content\/uploads\/sites\/31\/2023\/07\/microscope-view-Tanytarsini_DP-768x1024-1.jpg 768w, https:\/\/www.yorku.ca\/science\/wp-content\/uploads\/sites\/31\/2023\/07\/microscope-view-Tanytarsini_DP-768x1024-1-225x300.jpg 225w, https:\/\/www.yorku.ca\/science\/wp-content\/uploads\/sites\/31\/2023\/07\/microscope-view-Tanytarsini_DP-768x1024-1-300x400.jpg 300w\" sizes=\"auto, (max-width: 201px) 100vw, 201px\" \/><figcaption>Microscope view of a subfossil chironomid head capsule. This specimen belongs to the Tanytarsini. Photo courtesy of Dmitri Perlov<\/figcaption><\/figure><\/div>\n\n\n\n<p>Climate change is what really concerns Quinlan. A warmer climate means warmer winters and shorter ice coverage as well as warmer summers which causes a further loss of oxygen in the deep layers.<\/p>\n\n\n\n<p>\u201cClimate warming is already underway, and this is something that will take decades to reverse,\u201d he says.<\/p>\n\n\n\n<p>Some 13.2 million people live within the Lake Erie watershed, the most populated of the Great Lakes, representing about 34 per cent of the total population in the Great Lakes catchment area.<\/p>\n\n\n\n<p>Lake Erie is a bellwether for other Great Lakes as it has changed the most in response stress and remediation. The researchers say that wide-scale watershed actions are needed if Lake Erie\u2019s water quality and deep-water oxygen levels are to improve.<\/p>\n\n\n\n<p>The paper, <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0380133023001193\" target=\"_blank\" rel=\"noreferrer noopener\">Anthropogenic stressor impacts on hypolimnetic dissolved oxygen in Lake Erie: a chironomid-based paleolimnological assessment<\/a>, was published in the <em>Journal of Great Lakes Research<\/em>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Media release from July 25, 2023 快播视频 researchers take novel approach to look at history of deep-water oxygen in Lake Erie through insect larvae in lake sediment over last 150 years. Researchers at 快播视频 went searching for the fossilized remains of small insect larvae called chironomids, found in sediment in Lake Erie, to [&hellip;]<\/p>\n","protected":false},"author":1202,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","ngg_post_thumbnail":0,"footnotes":""},"categories":[3,22],"tags":[48,217,293,28,25,26,137,38,87,298],"class_list":["post-27856","post","type-post","status-publish","format-standard","hentry","category-biology","category-research","tag-biology","tag-climate-action","tag-climate-change","tag-faculty","tag-faculty-of-science","tag-keele-campus","tag-news","tag-research","tag-stay-informed","tag-unsdg"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>More algal 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