RESPONSES OF ZOOPLANKTON AND CHAOBORUS TO TEMEPHOS IN A NATURAL POND AND IN THE LABORATORY
Application of the organophosphorus insecticide temephos to a natural pond in central Minnesota was followed by reduction within 24 hr in all cladocerans, in Diaptomus leptopus and in Chaoborus americanus, and increases in cyclopoid copepods, copepod nauplii and rotifer Keratella cochlearis. aphnia...
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ftepa:oai:epaEIMS:45933 2023-05-15T18:49:43+02:00 RESPONSES OF ZOOPLANKTON AND CHAOBORUS TO TEMEPHOS IN A NATURAL POND AND IN THE LABORATORY J.C. Helgen N.J. Larson R.L. Anderson 2005-12-22T16:32:47Z http://oaspub.epa.gov/eims/eimsapi.dispdetail?deid=45933 unknown https://cfint.rtpnc.epa.gov/si/ntislink.cfm?dirEntryID=45933 NATIONAL HEALTH AND ENVIRONMENTAL EFFECTS RESEARCH LABORATORY Text 2005 ftepa 2007-11-21T13:50:49Z Application of the organophosphorus insecticide temephos to a natural pond in central Minnesota was followed by reduction within 24 hr in all cladocerans, in Diaptomus leptopus and in Chaoborus americanus, and increases in cyclopoid copepods, copepod nauplii and rotifer Keratella cochlearis. aphnia ulex that reappeared 35 days post-application were ex-ephippial. fter application, reproduction of cladocerans and Diaptomus was markedly reduced compared to the previous year, an effect attributed to temephos. aphnia population density was strongly reduced into the fall season, long after the spring applications, compared with both a reference pond's and the previous season's populations. On-site bioassays demonstrated 24-hr mortalities of Daphnia and Chaoborus that were comparable to the population decreases in the pond. aboratory toxicity tests showed Daphnia was the most sensitive followed by Chaoborus and Diaptomus. Comparable results were seen in the pond population changes, in situ bioassays arid laboratory toxicity data for Daphnia and for Chaoborus but sensitivities in the pond were somewhat greater than in the laboratory. isk assessment research calls for long-term field reproduction analysis to avoid a false "recovery" report, combined with laboratory life cycle analysis and short acute exposure tests. Text Copepods Rotifer Environmental Protection Agency (EPA): Science Inventory |
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Open Polar |
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Environmental Protection Agency (EPA): Science Inventory |
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ftepa |
language |
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description |
Application of the organophosphorus insecticide temephos to a natural pond in central Minnesota was followed by reduction within 24 hr in all cladocerans, in Diaptomus leptopus and in Chaoborus americanus, and increases in cyclopoid copepods, copepod nauplii and rotifer Keratella cochlearis. aphnia ulex that reappeared 35 days post-application were ex-ephippial. fter application, reproduction of cladocerans and Diaptomus was markedly reduced compared to the previous year, an effect attributed to temephos. aphnia population density was strongly reduced into the fall season, long after the spring applications, compared with both a reference pond's and the previous season's populations. On-site bioassays demonstrated 24-hr mortalities of Daphnia and Chaoborus that were comparable to the population decreases in the pond. aboratory toxicity tests showed Daphnia was the most sensitive followed by Chaoborus and Diaptomus. Comparable results were seen in the pond population changes, in situ bioassays arid laboratory toxicity data for Daphnia and for Chaoborus but sensitivities in the pond were somewhat greater than in the laboratory. isk assessment research calls for long-term field reproduction analysis to avoid a false "recovery" report, combined with laboratory life cycle analysis and short acute exposure tests. |
format |
Text |
author |
J.C. Helgen N.J. Larson R.L. Anderson |
spellingShingle |
J.C. Helgen N.J. Larson R.L. Anderson RESPONSES OF ZOOPLANKTON AND CHAOBORUS TO TEMEPHOS IN A NATURAL POND AND IN THE LABORATORY |
author_facet |
J.C. Helgen N.J. Larson R.L. Anderson |
author_sort |
J.C. Helgen |
title |
RESPONSES OF ZOOPLANKTON AND CHAOBORUS TO TEMEPHOS IN A NATURAL POND AND IN THE LABORATORY |
title_short |
RESPONSES OF ZOOPLANKTON AND CHAOBORUS TO TEMEPHOS IN A NATURAL POND AND IN THE LABORATORY |
title_full |
RESPONSES OF ZOOPLANKTON AND CHAOBORUS TO TEMEPHOS IN A NATURAL POND AND IN THE LABORATORY |
title_fullStr |
RESPONSES OF ZOOPLANKTON AND CHAOBORUS TO TEMEPHOS IN A NATURAL POND AND IN THE LABORATORY |
title_full_unstemmed |
RESPONSES OF ZOOPLANKTON AND CHAOBORUS TO TEMEPHOS IN A NATURAL POND AND IN THE LABORATORY |
title_sort |
responses of zooplankton and chaoborus to temephos in a natural pond and in the laboratory |
publishDate |
2005 |
url |
http://oaspub.epa.gov/eims/eimsapi.dispdetail?deid=45933 |
genre |
Copepods Rotifer |
genre_facet |
Copepods Rotifer |
op_source |
NATIONAL HEALTH AND ENVIRONMENTAL EFFECTS RESEARCH LABORATORY |
op_relation |
https://cfint.rtpnc.epa.gov/si/ntislink.cfm?dirEntryID=45933 |
_version_ |
1766243316646543360 |