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EFFECTS OF SEDIMENT-BOUND RESIDUES OF THE PYRETHROID INSECTICIDE FENVALERATE ON SURVIVAL AND REPRODUCTION OF MEIOBENTHIC COPEPODS
Citation:
Chandler, G. EFFECTS OF SEDIMENT-BOUND RESIDUES OF THE PYRETHROID INSECTICIDE FENVALERATE ON SURVIVAL AND REPRODUCTION OF MEIOBENTHIC COPEPODS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-90/093 (NTIS PB90245572), 1990.
Description:
Pure microcosm-cultured populations of benthic copepods were established from pristine or pesticide-impacted Spartina marsh creeks and used as efficient bioassay groups to assess lethal and sublethal effects of sediment-bound pesticide residues. espite a broad data base showing extreme sensitivity to water-solubilized fenvalerate by many marine invertebrates and fishes, a 7-day exposure to sediment-bound residues as high as 100 ppb caused no significant mortality for any life stages (i.e., nauplii, copepodites or adults of the benthic harpacticoid copepod Microarthridion littorale or Paronychocamntus wilsoni, and no mortality fo adults of Enhydrosoma proninquum. owever, sediment-bound residues as low as 25 ppb significantly depressed egg production (50-100% reduction) and mean clutch sizes (40-100% reduction) of fertile M. littorale and P.wilsoni. f sedimenting fenvalerate depresses copepod reproduction the field, then lowered recruitment of new individuals will lead inevitably to a decline in population growth.
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EFFECTS OF SEDIMENT-BOUND RESIDUES OF THE PYRETHROID INSECTICIDE FENVALERATE ON SURVIVAL AND REPRODUCTION OF MEIOBENTHIC COPEPODS