Charles J. Henny L.R. DeWeese J.G. Zinkl 1977 <div id="Abs1-section" class="c-article-section"><div id="Abs1-content" class="c-article-section__content"><p>Brain cholinesterase activities were determined in birds from forests sprayed with Dylox²<span>&nbsp;</span>at 1.13 kg/hectare (1 1b/acre — active ingredient [a.i.]) or Sevin-4-oil²<span>&nbsp;</span>at 1.13 kg/hectare (1 1b/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.</p></div></div> application/pdf 10.1007/BF01685928 en Springer Brain cholinesterase activities of birds from forests sprayed with trichlorfon (Dylox) and carbaryl (Sevin-4-oil) article