Acute, sublethal exposure to a pyrethroid insecticide alters behavior, growth, and predation risk in larvae of the fathead minnow (Pimephales promelas).

Abstract:

:The present study determined the effects of environmentally relevant, short-term (4-h) exposure to the pyrethroid insecticide esfenvalerate on mortality, food consumption, growth, swimming ability, and predation risk in larvae of the fathead minnow (Pimephales promelas). Acute effect concentrations were determined, and in subsequent experiments, fish were exposed to the following measured sublethal concentrations: 0.072, 0.455, and 1.142 microg/L of esfenvalerate. To measure growth rates (% dry wt/d), 8-d-old fathead minnows were exposed to esfenvalerate for 4 h, then transferred to control water and held for 7 d. Food consumption and abnormal swimming behavior were recorded daily. Additional behavioral experiments were conducted to evaluate how esfenvalerate affects the optomotor response of the fish. To quantify predation risk, esfenvalerate-exposed fathead minnow larvae were transferred to 9.5-L aquaria, each containing one juvenile threespine stickleback (Gasterosteus aculeatus). Sticklebacks were allowed to feed for 45 min, after which the number of surviving minnows was recorded. No mortality occurred during 4-h exposures to esfenvalerate, even at nominal concentrations of greater than 20 microg/L. Delayed mortality (50%) was observed at 2 microg/L after an additional 20 h in clean water. Fish exposed to 0.455 and 1.142 microg/L of esfenvalerate exhibited impaired swimming and feeding ability as well as reduced growth compared to fish exposed to 0.072 microg/L and controls. Predation risk also was significantly increased for larvae exposed to 0.455 and 1.142 microg/L of esfenvalerate. These results demonstrate that larval fish experiencing acute exposures to sublethal concentrations of this insecticide exhibit significant behavioral impairment, leading to reduced growth and increased susceptibility to predation, with potentially severe consequences for their ecological fitness.

journal_name

Environ Toxicol Chem

authors

Floyd EY,Geist JP,Werner I

doi

10.1897/07-448.1

subject

Has Abstract

pub_date

2008-08-01 00:00:00

pages

1780-87

issue

8

eissn

0730-7268

issn

1552-8618

pii

07-448

journal_volume

27

pub_type

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