{"id":714,"date":"2008-10-06T00:09:05","date_gmt":"2008-10-06T04:09:05","guid":{"rendered":"https:\/\/www.beyondpesticides.org\/dailynewsblog\/?p=714"},"modified":"2009-09-16T10:47:40","modified_gmt":"2009-09-16T14:47:40","slug":"study-finds-low-doses-of-pesticides-impact-amphibians","status":"publish","type":"post","link":"https:\/\/beyondpesticides.org\/dailynewsblog\/2008\/10\/study-finds-low-doses-of-pesticides-impact-amphibians\/","title":{"rendered":"Study Finds Low Doses of Pesticides Impact Amphibians"},"content":{"rendered":"<p><font size=\"2\">(Beyond Pesticides, October 6, 2008) University of Pittsburgh researchers have found that the commonly used insecticide <a href=\"https:\/\/www.beyondpesticides.org\/gateway\/pesticide\/malathion.htm \">malathion<\/a> can decimate tadpole populations by altering their food chain. The <a href=\"http:\/\/www.pitt.edu\/~biohome\/Dept\/pdf\/3098.pdf\">study<\/a>, published in the October 1 edition of <a href=\"http:\/\/www.esajournals.org\/loi\/ecap \">Ecological Applications<\/a>, finds that gradual amounts of malathion that were too small to directly kill developing leopard frog tadpoles instead sparked a biological chain of events that deprived them of their primary food source. As a result, nearly half the tadpoles in the experiment did not reach maturity and would have died in nature. The results build on a nine-year effort to investigate whether there is a link between pesticides and the global decline in amphibians, which are considered an environmental indicator species because of their sensitivity to pollutants. According to the researchers, their deaths may foreshadow the poisoning of other less environmentally-sensitivespecies, including humans. <\/p>\n<p>According to the <a href=\"http:\/\/www.epa.gov\/oppbead1\/pestsales\/01pestsales\/market_estimates2001.pdf\">U.S. Environmental Protection Agency <\/a>(EPA), malathion is the most commonly used insecticide in U.S. agriculture and the third most commonly used insecticide in the U.S. home and garden sector. It <a href=\"http:\/\/pubs.usgs.gov\/wri\/wri034203\/pdf\/wrir20034203.pdf \">has been detected <\/a>in the wetlands where frogs and other amphibians live.<\/p>\n<p>The researchers created simulated ponds from 300-gallon outdoor tanks containing wood frog and leopard frog tadpoles. They exposed the ponds to no malathion, moderate concentrations in a single dose, or low concentrations in weekly doses that mirror the levels tadpoles experience in nature. The doses of malathion in the simulated ponds were too low to directly kill the amphibians, but instead wiped out tiny animals known as zooplankton that eat algae that float in the water. With few zooplankton remaining, the algae, known as phytoplankton, grew rapidly and prevented sunlight from reaching the bottom-dwelling algae, or periphyton, which tadpoles eat. This chain of events occurred over a period of several weeks. The wood frog tadpoles, which mature quickly, were largely unaffected.<\/p>\n<p>Leopard frog tadpoles, on the other hand, require more time to develop into frogs and experienced slower growth as a result of the reduced amount of periphyton. Ultimately, 43 percent of the leopard frog tadpoles did not mature as a result of the repeated application of malathion at very low concentrations. Study author Rick Relyea, Ph.D., an associate professor of biological sciences at the University of  Pittsburgh School of Arts and Sciences, reported that the multiple low doses are a greater detriment than the single dose, with a concentration 25-times higher than the multiple applications combined. The single doses also wipe out the zooplankton, but they eventually recovere and the pond reverts back to its original state. The repeated doses prevents the zooplankton from recovering.<\/p>\n<p>\u201cThe chain of events caused by malathion deprived a large fraction of the leopard frog tadpoles of the nutrients they needed to metamorphose into adult frogs,\u201d Dr. Relyea said. \u201cRepeated applications sustained that disruption of the tadpoles&#8217; food supply. So, even concentrations that cannot directly kill tadpoles can indirectly kill them in large numbers.\u201d<\/p>\n<p>The research results should apply to several other insecticides that are highly lethal to zooplankton, including carbaryl, diazinon, endosulfan, esfenvalerate, and pyridaben, Dr. Relyea said. All of these chemicals are toxic to humans as well and are commonly used in the United States, although some are banned in other countries. The effect of insecticides and other pesticides on amphibians are not widely known because current regulations from EPA do not require amphibian testing. The EPA also relies on single-species tests to assess a pesticide&#8217;s risk and does not account for potential indirect repercussions.<\/p>\n<p>\u201cThe indirect impacts on the amphibians observed in this study could not be observed in traditional, single-species tests,\u201d Dr. Relyea said. \u201cThese results demonstrate that we need to take a much broader view of the consequences pesticides might have in our world.\u201d<\/p>\n<p>A <a href=\"http:\/\/www.werc.usgs.gov\/pubbriefs\/fellerspbmay2007.pdf \">U.S. Geological Survey study in 2007 <\/a>found that the breakdown products of chlorpyrifos, malathion and diazinon are ten to 100 times more toxic to amphibians than their parent compounds, which are already highly toxic to amphibians. <\/p>\n<p>Leopard and wood frogs naturally range across North America, including Pennsylvania and the Northeastern United States. Once plentiful, leopard frogs have declined in recent years.<\/p>\n<p>Dr. Relyea has <a href=\"http:\/\/www.pitt.edu\/~biohome\/Dept\/Frame\/Faculty\/relyeaabstract.htm#3156 \">published a number of papers <\/a>on the effects of pesticides on amphibians and aquatic communities, including a <a href=\"http:\/\/www.pitt.edu\/~biohome\/Dept\/pdf\/1703.pdf \">2005 study <\/a>suggesting that the popular weed-killer Roundup \u00ae is \u201cextremely lethal\u201d to amphibians in concentrations found in the environment.<\/p>\n<p>See <a href=\"https:\/\/www.beyondpesticides.org\/dailynewsblog\/index.php?s=frog \">Beyond Pesticides\u2019 Daily News Blog <\/a>for additional news stories on pesticides\u2019 impact on frogs.<\/font><\/p>\n","protected":false},"excerpt":{"rendered":"<p>(Beyond Pesticides, October 6, 2008) University of Pittsburgh researchers have found that the commonly used insecticide malathion can decimate tadpole populations by altering their food chain. The study, published in the October 1 edition of Ecological Applications, finds that gradual amounts of malathion that were too small to directly kill developing leopard frog tadpoles instead sparked a biological chain of events that deprived them of their primary food source. As a result, nearly half the tadpoles in the experiment did not reach maturity and would have died in nature. The results build on a nine-year effort to investigate whether there is a link between pesticides and the global decline in amphibians, which are considered an environmental indicator species because of their sensitivity to pollutants. According to the researchers, their deaths may foreshadow the poisoning of other less environmentally-sensitivespecies, including humans. According to the U.S. Environmental Protection Agency (EPA), malathion is the most commonly used insecticide in U.S. agriculture and the third most commonly used insecticide in the U.S. home and garden sector. It has been detected in the wetlands where frogs and other amphibians live. The researchers created simulated ponds from 300-gallon outdoor tanks containing wood frog and leopard frog [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[33,131,105,10,12,13],"tags":[],"class_list":["post-714","post","type-post","status-publish","format-standard","hentry","category-chlorpyrifos","category-diazinon","category-malathion","category-pesticide-regulation","category-water","category-wildlifeenvironment"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Study Finds Low Doses of Pesticides Impact 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\/2008\/10\/study-finds-low-doses-of-pesticides-impact-amphibians\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Study Finds Low Doses of Pesticides Impact Amphibians - Beyond Pesticides Daily News Blog\" \/>\n<meta property=\"og:description\" content=\"(Beyond Pesticides, October 6, 2008) University of Pittsburgh researchers have found that the commonly used insecticide malathion can decimate tadpole populations by altering their food chain. The study, published in the October 1 edition of Ecological Applications, finds that gradual amounts of malathion that were too small to directly kill developing leopard frog tadpoles instead sparked a biological chain of events that deprived them of their primary food source. As a result, nearly half the tadpoles in the experiment did not reach maturity and would have died in nature. The results build on a nine-year effort to investigate whether there is a link between pesticides and the global decline in amphibians, which are considered an environmental indicator species because of their sensitivity to pollutants. According to the researchers, their deaths may foreshadow the poisoning of other less environmentally-sensitivespecies, including humans. According to the U.S. Environmental Protection Agency (EPA), malathion is the most commonly used insecticide in U.S. agriculture and the third most commonly used insecticide in the U.S. home and garden sector. It has been detected in the wetlands where frogs and other amphibians live. The researchers created simulated ponds from 300-gallon outdoor tanks containing wood frog and leopard frog [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/beyondpesticides.org\/dailynewsblog\/2008\/10\/study-finds-low-doses-of-pesticides-impact-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=\"2008-10-06T04:09:05+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2009-09-16T14:47:40+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=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/beyondpesticides.org\/dailynewsblog\/2008\/10\/study-finds-low-doses-of-pesticides-impact-amphibians\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/beyondpesticides.org\/dailynewsblog\/2008\/10\/study-finds-low-doses-of-pesticides-impact-amphibians\/\"},\"author\":{\"name\":\"Beyond Pesticides\",\"@id\":\"https:\/\/beyondpesticides.org\/dailynewsblog\/#\/schema\/person\/1b5c0a0981b549cc5b628770073031f4\"},\"headline\":\"Study Finds Low Doses of Pesticides Impact Amphibians\",\"datePublished\":\"2008-10-06T04:09:05+00:00\",\"dateModified\":\"2009-09-16T14:47:40+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/beyondpesticides.org\/dailynewsblog\/2008\/10\/study-finds-low-doses-of-pesticides-impact-amphibians\/\"},\"wordCount\":743,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/beyondpesticides.org\/dailynewsblog\/#organization\"},\"articleSection\":[\"Chlorpyrifos\",\"Diazinon\",\"Malathion\",\"Pesticide Regulation\",\"Water\",\"Wildlife\/Endangered Sp.\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/beyondpesticides.org\/dailynewsblog\/2008\/10\/study-finds-low-doses-of-pesticides-impact-amphibians\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/beyondpesticides.org\/dailynewsblog\/2008\/10\/study-finds-low-doses-of-pesticides-impact-amphibians\/\",\"url\":\"https:\/\/beyondpesticides.org\/dailynewsblog\/2008\/10\/study-finds-low-doses-of-pesticides-impact-amphibians\/\",\"name\":\"Study Finds Low Doses of Pesticides Impact Amphibians - 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The study, published in the October 1 edition of Ecological Applications, finds that gradual amounts of malathion that were too small to directly kill developing leopard frog tadpoles instead sparked a biological chain of events that deprived them of their primary food source. As a result, nearly half the tadpoles in the experiment did not reach maturity and would have died in nature. The results build on a nine-year effort to investigate whether there is a link between pesticides and the global decline in amphibians, which are considered an environmental indicator species because of their sensitivity to pollutants. According to the researchers, their deaths may foreshadow the poisoning of other less environmentally-sensitivespecies, including humans. According to the U.S. Environmental Protection Agency (EPA), malathion is the most commonly used insecticide in U.S. agriculture and the third most commonly used insecticide in the U.S. home and garden sector. 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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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