{"id":32415,"date":"2020-07-08T11:30:59","date_gmt":"2020-07-08T15:30:59","guid":{"rendered":"https:\/\/www.fondriest.com\/news\/?p=32415"},"modified":"2020-07-17T11:15:31","modified_gmt":"2020-07-17T15:15:31","slug":"storms-cause-extended-elevated-contaminant-concentrations-in-urban-streams","status":"publish","type":"post","link":"https:\/\/www.fondriest.com\/news\/storms-cause-extended-elevated-contaminant-concentrations-in-urban-streams.htm","title":{"rendered":"Storms Cause Extended, Elevated Contaminant Concentrations in Urban Streams"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Each fall in Puget Sound, coho salmon leave the salt water and swim up freshwater streams. They head upstream to spawn: lay their eggs and die.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Death is always the end of this journey for coho salmon, but in streams now running through urban areas, stormwater runoff kills them before they can spawn.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This phenomenon, called Urban Runoff Mortality Syndrome, can kill up to 70-90% of coho salmon in an affected area.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201c\u2018Woah\u2019 is a pretty common response,\u201d said Kathy Peter, a research scientist formerly at University of Washington Tacoma and the Center for Urban Waters.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This phenomenon adds pressure to the Puget Sound population, already considered a species of concern by the United States Fish and Wildlife Service under the Endangered Species Act.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In new research <\/span><a href=\"https:\/\/pubs.acs.org\/doi\/abs\/10.1021\/acs.est.0c00872\"><span style=\"font-weight: 400;\">published in Environmental Science and Technology<\/span><\/a><span style=\"font-weight: 400;\">, Peter and a team of researchers show that the issue of runoff can be more complicated than previously thought.<\/span><\/p>\n<h3><span style=\"color: #808080;\">A new pattern of pollution<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">In urban runoff studies, the general assumption is that the first flush carries the most pollution.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For many contaminants, like sediments and metals, most pollutants are carried off roads and other impermeable urban surfaces by the first rainfall from a storm. But, for emerging organic contaminants, like pharmaceuticals, pesticides and chemicals from tire tread wear particles, that\u2019s not the case.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cWhat we\u2019re calling the pollutograph, which is just the profile of contaminant concentration over the course of the storm, is a lot broader than the hydrograph, which is the profile of flow over the course of the storm,\u201d Peter said of emerging organic contaminants washed into a stream south of Seattle during storms.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Concentrations of sediments and metals in runoff rise sharply at the beginning of a storm, and then taper off as the storm continues. With emerging organic contaminants, however, the high concentrations persist in streams beyond the first flush.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">As streams fill up and stormwater moves contaminants from the surrounding watershed into the stream, concentrations of contaminants can fall below harmful levels if they are diluted by additional incoming stormwater. If emerging organic contaminants remain at elevated levels for longer, the period of exposure and potential risk to plants and animals lengthens.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Stormwater management interventions aimed at keeping creeks and salmon healthy, need to focus on more than just first flush.<\/span><\/p>\n<div id=\"attachment_32419\" style=\"width: 868px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-32419\" class=\" wp-image-32419\" src=\"https:\/\/www.fondriest.com\/news\/wp-content\/uploads\/2020\/07\/urban_runoff-600x233.jpg\" alt=\"urban runoff\" width=\"858\" height=\"333\" srcset=\"https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/07\/urban_runoff-600x233.jpg 600w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/07\/urban_runoff-300x116.jpg 300w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/07\/urban_runoff-768x298.jpg 768w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2020\/07\/urban_runoff.jpg 940w\" sizes=\"auto, (max-width: 858px) 100vw, 858px\" \/><p id=\"caption-attachment-32419\" class=\"wp-caption-text\"><span style=\"color: #808080;\">Equipment monitors contamination concentrations in Miller Creek in Burien, Washington. (Credit: Kathy Peter)<\/span><\/p><\/div>\n<p><span style=\"font-weight: 400;\">But the study found new reasons to pay attention to the beginning of the storm, too. Even the earliest rain in a storm system moved large amounts of emerging organic contaminants.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cAt the very beginning of the storm when it was just starting to drizzle, we were already seeing really high concentrations in the creek,\u201d Peter said.<\/span><\/p>\n<h3><span style=\"color: #808080;\">Urban Runoff Mortality Syndrome in coho<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">The rainstorms that cause urban runoff are also a signal to coho to begin their journey upstream to spawn. But, the rainstorms that swell streams to make them easier to travel also raise runoff contaminant concentrations to lethal levels.\u00a0<\/span><\/p>\n<span class='bctt-click-to-tweet'><span class='bctt-ctt-text'><a href='https:\/\/x.com\/intent\/tweet?url=https%3A%2F%2Fwww.fondriest.com%2Fnews%2F%3Fp%3D32415&#038;text=%E2%80%9CUrban%20stormwater%20is%20acutely%20toxic%20to%20coho%20salmon%2C%E2%80%9D%20Peter%20said.%20%E2%80%9CHow%20it%20kills%20them%20is%20the%20million%20dollar%20question.%E2%80%9D&#038;via=FondriestEnv&#038;related=FondriestEnv' target='_blank'rel=\"noopener noreferrer\">\u201cUrban stormwater is acutely toxic to coho salmon,\u201d Peter said. \u201cHow it kills them is the million dollar question.\u201d <\/a><\/span><a href='https:\/\/x.com\/intent\/tweet?url=https%3A%2F%2Fwww.fondriest.com%2Fnews%2F%3Fp%3D32415&#038;text=%E2%80%9CUrban%20stormwater%20is%20acutely%20toxic%20to%20coho%20salmon%2C%E2%80%9D%20Peter%20said.%20%E2%80%9CHow%20it%20kills%20them%20is%20the%20million%20dollar%20question.%E2%80%9D&#038;via=FondriestEnv&#038;related=FondriestEnv' target='_blank' class='bctt-ctt-btn'rel=\"noopener noreferrer\">Share on X<\/a><\/span>\n<p><span style=\"font-weight: 400;\">But kill them it does.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Coho affected by urban runoff mortality syndrome swim in circles, gape for air at the water\u2019s surface and splay their fins out before dying, the Puget Sound Stormwater Science Team reports.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The Puget Sound Stormwater Science Team made up of researchers from Washington State University, the United States Fish and Wildlife Service and the National Oceanic and Atmospheric Administration <\/span><a href=\"https:\/\/www.arcgis.com\/apps\/MapSeries\/index.html?appid=5dd4a36a2a5148a28376a0b81726a9a4\"><span style=\"font-weight: 400;\">predicts annual mean mortality of 10-40%<\/span><\/a><span style=\"font-weight: 400;\"> for coho for much of Puget Sound and over 40% in some watersheds in and around Seattle and Tacoma.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Normal prespawn mortality for coho is nearer 1%, Peter said.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Urban runoff mortality syndrome has been documented in coho along the Pacific coast from California to British Columbia, Canada.<\/span><\/p>\n<h3><span style=\"color: #808080;\">Tires, an important source of microplastics and contaminants<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">As people travel by cars, tires wear down and leave behind little bits of themselves called tire tread wear particles.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Tire tread wear particles are already of interest as a source of microplastics, but they also release a chemical cocktail in streams.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The chemicals released by these particles are of particular importance because they could be central to understanding urban runoff mortality syndrome in coho.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u201cWe\u2019ve previously shown that the chemical profile of stormwater and road runoff that we know is toxic to coho is similar to the chemical profile of tire wear particles,\u201d Peter said.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Peter tested runoff-swollen streams for chemicals that come out of tire tread particles and found a period of high concentration in streams during storms that extended beyond first flush.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Because cars are ubiquitous in urban settings, tire wear particles might be a \u201csemi-infinite\u201d source of contamination to urban runoff, the study says.<\/span><\/p>\n<h3><span style=\"color: #808080;\">Questions remain concerning runoff and coho<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Beyond the fact that researchers aren\u2019t entirely sure how urban runoff kills coho, there is some uncertainty about where all the contaminants in runoff come from.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Some researchers put forward a mud puddle hypothesis, which suggests there are reservoirs of certain contaminants throughout the environment: in lawns and urban sediments, or even in stormwater conveyance systems. Runoff from these sources adds to what already comes from roads, elevating overall levels and offering new opportunities for mitigating contamination before it enters streams.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Until effective mitigation measures are in place, storms that draw salmon into streams from Puget Sound will continue to flush deadly contaminants at persistent, elevated levels toward those incoming coho.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Elevated contamination from tire particles in northwest stormwater could be killing spawning coho salmon.<\/p>\n","protected":false},"author":37,"featured_media":32418,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,5,458,8,49,466,462,510],"tags":[2179,970,60,2180,944,109,608,2172,2175,2174,2173,2178,2176,2177],"class_list":["post-32415","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aquatic_species-htm","category-featured-articles","category-fish-science","category-newsfeed","category-rivers-streams","category-salmon","category-species","category-water-quality","tag-center-for-urban-waters","tag-coho-salmon","tag-featured","tag-kathy-peter","tag-microplastics","tag-news-ticker","tag-nist","tag-puget-sound-contamination","tag-salmon-mortality","tag-stormwater-runoff","tag-tire-tread-wear-particles","tag-university-of-washington-tacoma","tag-urban-runoff-mortality-syndrome","tag-usfws"],"remote_post_permalink":false,"remote_post_featured_image":false,"yoast_head":"<!-- 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