Ecotoxicology (1999) 8, 201-214

M.I. Goldstein, T.E. Lacher Jr., G. Woodbridge, M.J. Bechard, S.B. Canavelli, M.E. Zaccagnini, G.P. Cobb, E.J. Scollon, R. Tribolet and M.J. Hooper (1999)
Monocrotophos-induced mass mortality of Swainson's Hawks in Argentina, 1995-96
Ecotoxicology 8 (3), 201-214
Abstract: Swainson's hawks (Bateo swainsoni) were observed in the grasslands (pampas) of Argentina during the austral summer of 1995 96. Widespread agrochemical use to control insects had a profound effect on flocks of hawks foraging on grasshoppers and caterpillars throughout the pampas. We describe 19 mortality incidents and an estimated 5,095 dead hawks. Forensic analysis indicated that the organophosphate insecticide monocrotophos was responsible for the deaths at six separate sites, accounting for over 4,000 of the mortalities. Brain cholinesterase was lethally inhibited (> 95%) and monocrotophos residues (n = 31/45, mean = 0.20 ppm, range 0.05-1.08 ppm) were found in the contents of the gastrointestinal tract. No other insecticide residues were found. Sample analyses, combined with interviews with farmers, indicated that monocrotophos was responsible for deaths at 17 of 19 mortality incidents.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Maria Elena Zaccagnini

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
resistance to pesticides

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
Buteo swainsoni (predator)			Argentina