TY - JOUR
T1 - Cholinesterase profiles in two species of wild birds exposed to insecticide sprays in their natural habitat
AU - Yawetz, Aminadav
AU - Zook‐Rimon, Zohar
AU - Dotan, Aharon
PY - 1993
Y1 - 1993
N2 - During summer season, a field survey was conducted to assess the extent of stress to which two species of wild birds might have been subjected, due to their dwelling near cotton fields sprayed with insecticides. One of the bird species, the cattle egret Bubulcus ibis, showed no significant changes either in brain acetylcholinesterase (AChE) or in plasma butyrylcholinesterase (BuChE) activities in samples collected before, during, and after the spraying season. With the spur‐wing plover, Hoplopterus spinosus, there was a significant decrease both in brain AChE and plasma BuChE activities in July and August, the period when insecticide spray was most frequent. In laboratory experiments it was found that this species could survive higher doses of parathion, and specimens surviving the treatment showed higher residual plasma BuChE activity and a faster return of that activity to normal compared to Bubulcus specimens. Brain AChE from the Hoplopterus showed a lower Ki value for inhibition by paraoxon or malaoxon compared to the same values recorded for the Bubulcus, indicating that the enzyme from the Hoplopterus brain is less sensitive to inhibition by paraoxon or malaoxon. The finding that the more resistant Hoplopterus showed a decrease in cholinesterase activity during the cotton spraying season may therefore be due to the territorial habits of this species. © 1993 Wiley‐Liss, Inc.
AB - During summer season, a field survey was conducted to assess the extent of stress to which two species of wild birds might have been subjected, due to their dwelling near cotton fields sprayed with insecticides. One of the bird species, the cattle egret Bubulcus ibis, showed no significant changes either in brain acetylcholinesterase (AChE) or in plasma butyrylcholinesterase (BuChE) activities in samples collected before, during, and after the spraying season. With the spur‐wing plover, Hoplopterus spinosus, there was a significant decrease both in brain AChE and plasma BuChE activities in July and August, the period when insecticide spray was most frequent. In laboratory experiments it was found that this species could survive higher doses of parathion, and specimens surviving the treatment showed higher residual plasma BuChE activity and a faster return of that activity to normal compared to Bubulcus specimens. Brain AChE from the Hoplopterus showed a lower Ki value for inhibition by paraoxon or malaoxon compared to the same values recorded for the Bubulcus, indicating that the enzyme from the Hoplopterus brain is less sensitive to inhibition by paraoxon or malaoxon. The finding that the more resistant Hoplopterus showed a decrease in cholinesterase activity during the cotton spraying season may therefore be due to the territorial habits of this species. © 1993 Wiley‐Liss, Inc.
KW - bimolecular rate constant
KW - brain acetylcholinesterase
KW - malaoxon
KW - paraoxon
KW - parathion
KW - plasma butyrylcholinesterase
UR - http://www.scopus.com/inward/record.url?scp=84990425313&partnerID=8YFLogxK
U2 - 10.1002/arch.940220315
DO - 10.1002/arch.940220315
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AN - SCOPUS:84990425313
SN - 0739-4462
VL - 22
SP - 501
EP - 509
JO - Archives of Insect Biochemistry and Physiology
JF - Archives of Insect Biochemistry and Physiology
IS - 3-4
ER -