Cholinesterase response in native birds exposed to fenitrothion during locust control operations in Eastern Australia

Fildes, Karen, Astheimer, Lee B., Story, Paul, Buttemer, William A. and Hooper, Michael J. 2006, Cholinesterase response in native birds exposed to fenitrothion during locust control operations in Eastern Australia, Environmental toxicology and chemistry, vol. 25, no. 11, pp. 2964-2970, doi: 10.1897/05-585R.1.

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Title Cholinesterase response in native birds exposed to fenitrothion during locust control operations in Eastern Australia
Author(s) Fildes, Karen
Astheimer, Lee B.
Story, Paul
Buttemer, William A.
Hooper, Michael J.
Journal name Environmental toxicology and chemistry
Volume number 25
Issue number 11
Start page 2964
End page 2970
Publisher Society of Environmental Toxicology and Chemistry
Place of publication Pensacola, Fla.
Publication date 2006-11
ISSN 0730-7268
Keyword(s) birds
cholinesterase inhibition
locust control
Summary Huge aggregations of flightless locust nymphs pose a serious threat to agriculture when they reach plague proportions but provide a very visible and nutritious resource for native birds. Locust outbreaks occur in spring and summer months in semiarid regions of Australia. Fenitrothion, an organophosphate pesticide, is sprayed aerially to control locust plagues. To evaluate fenitrothion exposure in birds attending locust outbreaks, we measured total plasma cholinesterase (ChE), butrylcholinesterase (BChE), and acetylcholinesterase (AChE) activities in four avian species captured pre- and postfenitrothion application and ChE reactivation in birds caught postspray only. Eleven of 21 plasma samples from four species had ChE activity below the diagnostic threshold (two standard deviations below the mean ChE activity of prespray samples). Granivorous zebra finches (Taeniopygia guttata) and insectivorous white-winged trillers (Lalage sueurii) had significantly lower mean plasma total ChE, BChE, and AChE activity postspray, while other insectivores, white-browed (Artamus superciliosus) and masked woodswallows (Artamus personatus), did not. Cholinesterase was reactivated in 19 of the 73 plasma samples and in one of three brain samples. We conclude that native bird species are exposed to fenitrothion during locust control operations. This exposure could have detrimental impacts, as both locust outbreaks and avian reproductive events are stimulated by heavy summer rainfall, leading to co-occurrence of locust control and avian breeding activities.
Language eng
DOI 10.1897/05-585R.1
Field of Research 060299 Ecology not elsewhere classified
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2006, SETAC
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