title: Brain cholinesterase activities of birds from forests sprayed with trichlorfon (Dylox) and carbaryl (Sevin-4-oil).
abstract: Brain cholinesterase activities were determined in birds from forests sprayed with Dylox(2) at 1.13 kg/hectare (1 lb/acre - active ingredient [a.i.]) or Sevin-4-oil(2) at 1.13 kg/hectare (1 lb/acre - a.i.) for up to 5 days postspray. Of ten bird species evaluated from  the Dylox spray area, four species represented by six individuals had values which were depressed more than 2 standard deviations below the mean. Three of these activities (two species) were about 20% less than the mean. Of 12 species evaluated from the Sevin-4-oil spraying, three individuals representing three species had depressed values. One value was depressed greater than 20% below the mean. Half of the depressed activities were in canopy-dwelling birds collected on the day of spray.
mesh_terms: D000818:Animals; D001717:Birds / Q000378:metabolism*; D001921:Brain / Q000187:drug effects / Q000201:enzymology*; D012721:Carbaryl / Q000494:pharmacology*; D002802:Cholinesterases / Q000378:metabolism*; D003864:Depression, Chemical; D013997:Time Factors; D014236:Trichlorfon / Q000494:pharmacology*
chemical_list: D014236:Trichlorfon; D002802:Cholinesterases; D012721:Carbaryl