| Abstract: | Earthworms can accumulate persistent soilborne insecticides and are an important source of contamination of terrestrail wildlife. We treated experimental plots once with dieldrin, DDT, or heptachlor, and measured changes in insecticide concentrations in earthworms over a 20-year period. We estimated ‘half-times,‘ defined as the time for a concentration in earthworms to be reduced by half. Deldrin had a half-time of 5.4 years. DDE, the metabolite of DDT most important to wildlife, increased until the third year and then decreased with a half-time of 5.7 years. Heptachlor epoxide, the metabolite of hepatachlor most important to wildlife, increased until the second year and then decreased with a half-time of 4.3 years. The declining parts of the curves of all three compounds fit exponential decay equations reasonably well. The estimates persistence are relevant to insecticides at low or moderate concentrations in relatively undistrubed soils in temperate climates. |
| Genre: | Article |
| ProdID: | 5222276 |
| Citation Author: | Beyer, W.N.; Krynitsky, A.J. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation End Page: | 273 |
| Citation Issue: | 5 |
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| Citation Language: | English |
| Citation Larger Work Title: | Ambio |
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| Citation Number Of Pages: | 3 |
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| Citation Phsyical Description: | 271-273 |
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| Citation Public Comments: | 3693_Beyer.pdf |
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| Citation Search Results Text: | Long-term persistence of dieldrin, DDT, and heptachlor epoxide in earthworms; 1989; Article; Journal; Ambio; Beyer, W.N.; Krynitsky, A.J. |
| Citation Start Page: | 271 |
| Citation Volume: | 18 |
| Citation Year: | 1989 |
| Type: | citation/reference |
| Text: | Long-term persistence of dieldrin, DDT, and heptachlor epoxide in earthworms; 1989; Article; Journal; Ambio; Beyer, W.N.; Krynitsky, A.J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DOCUMENT): | http://www.jstor.org/stable/4313584 |
| Date Other: | Wed, 16 Jun 2010 12:19 -0500 |
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