{"id":111,"date":"2007-06-01T18:02:27","date_gmt":"2007-06-01T22:02:27","guid":{"rendered":"https:\/\/www.beyondpesticides.org\/dailynewsblog\/?p=111"},"modified":"2007-12-11T10:29:42","modified_gmt":"2007-12-11T14:29:42","slug":"usgs-finds-common-breakdown-products-are-lethal-to-amphibians","status":"publish","type":"post","link":"https:\/\/beyondpesticides.org\/dailynewsblog\/2007\/06\/usgs-finds-common-breakdown-products-are-lethal-to-amphibians\/","title":{"rendered":"USGS Finds Common Breakdown Products Are Lethal to Amphibians"},"content":{"rendered":"<p><font size=\"2\">(<em>Beyond Pesticides<\/em>, June 4, 2007) The breakdown products (oxons) of the three most commonly used organophosphate pesticides in California&#8217;s agricultural Central Valley \u2014 <a target=\"_blank\" href=\"https:\/\/www.beyondpesticides.org\/gateway\/index.htm#chlorpyrifos\">chlorpyrifos<\/a>, <a target=\"_blank\" href=\"https:\/\/www.beyondpesticides.org\/gateway\/index.htm#malathion\">malathion<\/a> and <a target=\"_blank\" href=\"https:\/\/www.beyondpesticides.org\/gateway\/index.htm#diazinon\">diazinon<\/a> &#8211; are 10 &#8211; 100 times more toxic to amphibians than their parent compounds, which are already highly toxic to amphibians, according to a study released last Wednesday by scientists of Southern Illinois University, Carbondale, and the U.S. Geological Survey (USGS) Western Ecological Research Center.<\/font><\/p>\n<p><font size=\"2\">The results of the laboratory experiments on the toxicity of the three breakdown products were published in the journal <em>Environmental Pollution<\/em>. The title of the article is &#8220;<a target=\"_blank\" href=\"http:\/\/www.ncbi.nlm.nih.gov\/entrez\/query.fcgi?cmd=Retrieve&#038;db=pubmed&#038;dopt=Abstract&#038;list_uids=17218044\">Comparative toxicity of chlorpyrifos, diazinon, malathion and their oxon derivatives to larval Rana boylii<\/a>.&#8221;<\/font><\/p>\n<p><font size=\"2\">&#8220;Since some of the parent pesticide compounds are already at concentrations sufficient to cause significant amphibian mortality in the Sierra Nevada, the higher toxicity of the breakdown products poses a serious problem,&#8221; said Gary Fellers, Ph.D., coauthor of the study.<\/font><\/p>\n<p><font size=\"2\">Donald Sparling, Ph.D., a research biologist and contaminants specialist at Southern Illinois University, and Dr. Fellers, a research biologist and amphibian specialist at the USGS Western Ecological Research Center in California, conducted laboratory tests to determine the acute toxicity &#8211; the lethal dosage causing death in 96 hours or less &#8211; of chlorpyrifos, malathion and diazinon, and their oxon derivatives on tadpoles of the foothill yellow-legged frog (<em>Rana boylii<\/em>).<\/font><\/p>\n<p><font size=\"2\">Organophosphate pesticides have been implicated in the declines of several amphibian species in the California Central Valley and in downwind montane areas, including the Cascades frog, California red-legged frog, mountain yellow-legged frog and the foothill yellow-legged frog, all of which inhabit foothill or montane regions east of the Central Valley.<\/font><\/p>\n<p><font size=\"2\">More than 6.5 million pounds of organophosphate active ingredients were used in California during 2004, the most recent year for which data are available. Researchers estimate that this accounts for about 25 percent of organophosphate pesticide use nationwide.<\/font><\/p>\n<p><font size=\"2\">Organophosphate pesticides suppress an enzyme called acetylcholinesterase, which is essential for the proper functioning of the nervous system. Reduced levels of acetylcholinesterase cause neurological synapses to fire repeatedly and uncontrollably, leading to death, usually by asphyxiation as the animal loses respiratory control. Most pesticides of this group reach their greatest potencies when metabolized internally and converted to an oxon form in the liver. However, oxons can also be found in the environment, formed by bacterial decay of the parent pesticide.<\/font><\/p>\n<p><font size=\"2\">For the laboratory experiments, tadpoles were raised from eggs collected from a stream in the California Coast Range, upwind of agricultural activities in the Central Valley and away from areas where significant quantities of pesticides are used. Test results indicated that the degradate of chlorpyrifos, chloroxon, killed all tadpoles and was at least 100 times more toxic than the lowest concentration of the parent compound, which resulted in no mortality. Maloxon was nearly 100 times more toxic than malathion, and diazoxon was about 10 times more toxic than diazinon.<\/font><\/p>\n<p><font size=\"2\">&#8220;Other data published in 2001 and new unpublished data show that these pesticides are widespread, even in pristine areas of the Sierra Nevada Mountains,&#8221; Dr. Sparling said. &#8220;The combination of field and laboratory studies is revealing that organophosphorus pesticides are posing serious hazards to the welfare and survival of native amphibians in California.&#8221;<\/font><\/p>\n<p><font size=\"2\">The authors noted that amphibians inhabiting ponds in the Central Valley of California could be simultaneously exposed to two or all three of these pesticides and their oxons. &#8220;Because of this,&#8221; said Dr. Sparling, &#8220;the potential for interactive effects of these chemicals needs to be explored.&#8221;<\/font><\/p>\n<p><font size=\"2\">Organophosphate pesticides form the largest group of chemicals used in the control of pests, including invertebrates, vertebrates and, to a lesser extent, plants. Some 200 organophosphate pesticides available in this class have been formulated into thousands of different products for use in agriculture, forests, gardens, homes and industrial sites.<\/font><\/p>\n<p><font size=\"2\">This finding adds to a growing body of literature documenting the widespread presence and subsequent danger of pesticides on water quality and aquatic organisms. For more information, see Beyond Pesticides\u2019 new report <a target=\"_blank\" href=\"https:\/\/www.beyondpesticides.org\/water\/\"><em>Threatened Waters: Turning the Tide on Pesticide Contamination<\/em><\/a>.<\/font><\/p>\n<p><font size=\"2\"><em>Source: <a target=\"_blank\" href=\"http:\/\/www.usgs.gov\/newsroom\/article.asp?ID=1684\">USGS Press Release<\/a><\/em><br \/>\n<\/font><\/p>\n","protected":false},"excerpt":{"rendered":"<p>(Beyond Pesticides, June 4, 2007) The breakdown products (oxons) of the three most commonly used organophosphate pesticides in California&#8217;s agricultural Central Valley \u2014 chlorpyrifos, malathion and diazinon &#8211; are 10 &#8211; 100 times more toxic to amphibians than their parent compounds, which are already highly toxic to amphibians, according to a study released last Wednesday by scientists of Southern Illinois University, Carbondale, and the U.S. Geological Survey (USGS) Western Ecological Research Center. The results of the laboratory experiments on the toxicity of the three breakdown products were published in the journal Environmental Pollution. The title of the article is &#8220;Comparative toxicity of chlorpyrifos, diazinon, malathion and their oxon derivatives to larval Rana boylii.&#8221; &#8220;Since some of the parent pesticide compounds are already at concentrations sufficient to cause significant amphibian mortality in the Sierra Nevada, the higher toxicity of the breakdown products poses a serious problem,&#8221; said Gary Fellers, Ph.D., coauthor of the study. Donald Sparling, Ph.D., a research biologist and contaminants specialist at Southern Illinois University, and Dr. Fellers, a research biologist and amphibian specialist at the USGS Western Ecological Research Center in California, conducted laboratory tests to determine the acute toxicity &#8211; the lethal dosage causing death in 96 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21,13],"tags":[],"class_list":["post-111","post","type-post","status-publish","format-standard","hentry","category-chemicals","category-wildlifeenvironment"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>USGS Finds Common Breakdown Products Are Lethal to Amphibians - Beyond Pesticides Daily News Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/beyondpesticides.org\/dailynewsblog\/2007\/06\/usgs-finds-common-breakdown-products-are-lethal-to-amphibians\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"USGS Finds Common Breakdown Products Are Lethal to Amphibians - Beyond Pesticides Daily News Blog\" \/>\n<meta property=\"og:description\" content=\"(Beyond Pesticides, June 4, 2007) The breakdown products (oxons) of the three most commonly used organophosphate pesticides in California&#8217;s agricultural Central Valley \u2014 chlorpyrifos, malathion and diazinon &#8211; are 10 &#8211; 100 times more toxic to amphibians than their parent compounds, which are already highly toxic to amphibians, according to a study released last Wednesday by scientists of Southern Illinois University, Carbondale, and the U.S. Geological Survey (USGS) Western Ecological Research Center. The results of the laboratory experiments on the toxicity of the three breakdown products were published in the journal Environmental Pollution. The title of the article is &#8220;Comparative toxicity of chlorpyrifos, diazinon, malathion and their oxon derivatives to larval Rana boylii.&#8221; &#8220;Since some of the parent pesticide compounds are already at concentrations sufficient to cause significant amphibian mortality in the Sierra Nevada, the higher toxicity of the breakdown products poses a serious problem,&#8221; said Gary Fellers, Ph.D., coauthor of the study. Donald Sparling, Ph.D., a research biologist and contaminants specialist at Southern Illinois University, and Dr. Fellers, a research biologist and amphibian specialist at the USGS Western Ecological Research Center in California, conducted laboratory tests to determine the acute toxicity &#8211; the lethal dosage causing death in 96 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/beyondpesticides.org\/dailynewsblog\/2007\/06\/usgs-finds-common-breakdown-products-are-lethal-to-amphibians\/\" \/>\n<meta property=\"og:site_name\" content=\"Beyond Pesticides Daily News Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/beyondpesticides\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/beyondpesticides\/\" \/>\n<meta property=\"article:published_time\" content=\"2007-06-01T22:02:27+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2007-12-11T14:29:42+00:00\" \/>\n<meta name=\"author\" content=\"Beyond Pesticides\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@ByondPesticides\" \/>\n<meta name=\"twitter:site\" content=\"@ByondPesticides\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Beyond Pesticides\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/beyondpesticides.org\/dailynewsblog\/2007\/06\/usgs-finds-common-breakdown-products-are-lethal-to-amphibians\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/beyondpesticides.org\/dailynewsblog\/2007\/06\/usgs-finds-common-breakdown-products-are-lethal-to-amphibians\/\"},\"author\":{\"name\":\"Beyond Pesticides\",\"@id\":\"https:\/\/beyondpesticides.org\/dailynewsblog\/#\/schema\/person\/1b5c0a0981b549cc5b628770073031f4\"},\"headline\":\"USGS Finds Common Breakdown Products Are Lethal to Amphibians\",\"datePublished\":\"2007-06-01T22:02:27+00:00\",\"dateModified\":\"2007-12-11T14:29:42+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/beyondpesticides.org\/dailynewsblog\/2007\/06\/usgs-finds-common-breakdown-products-are-lethal-to-amphibians\/\"},\"wordCount\":670,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/beyondpesticides.org\/dailynewsblog\/#organization\"},\"articleSection\":[\"Chemicals\",\"Wildlife\/Endangered Sp.\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/beyondpesticides.org\/dailynewsblog\/2007\/06\/usgs-finds-common-breakdown-products-are-lethal-to-amphibians\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/beyondpesticides.org\/dailynewsblog\/2007\/06\/usgs-finds-common-breakdown-products-are-lethal-to-amphibians\/\",\"url\":\"https:\/\/beyondpesticides.org\/dailynewsblog\/2007\/06\/usgs-finds-common-breakdown-products-are-lethal-to-amphibians\/\",\"name\":\"USGS Finds Common Breakdown Products Are Lethal to Amphibians - 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The founders, who established Beyond Pesticides (originally as National Coalition Against the Misuse of Pesticides) as a nonprofit membership organization in 1981, felt that without the existence of such an organized, national network, local, state and national pesticide policy would become, under chemical industry pressure, increasingly unresponsive to public health and environmental concerns. Beyond Pesticides believes that people must have a voice in decisions that affect them directly. We believe decisions should not be made for us by chemical companies or by decision-makers who either do not have all of the facts or refuse to consider them. Learn more about our work, read A Year in Review\u20142021, our accomplishments are your victories! Beyond Pesticides seeks to protect healthy air, water, land, and food for ourselves and future generations. By forging ties with governments, nonprofits, and people who rely on these natural resources, we reduce the need for unnecessary pesticide use and protect public health and the environment. Beyond Pesticides provides hands-on services to the public and supports local action by: identifying and interpreting hazards; and, designing safe pest management programs. With the information provided by Beyond Pesticides, people may not only be able to make informed choices and adopt practices that protect themselves and their families from unnecessary exposure to pesticides, but they will be able to effect changes on community-wide pest management decisions and policies that govern pesticide use, such as pesticide uses in parks, schools, for community insect control and along roadsides. 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