« Previous Abstract"Endophytic fungal community of Rosa damascena Mill. as a promising source of indigenous biostimulants: Elucidating its spatial distribution, chemical diversity, and ecological functions"    Next Abstract"Exposure to Inhalable Dust, Endotoxin, and Total Volatile Organic Carbons on Dairy Farms Using Manual and Automated Feeding Systems" »

J Insect Physiol

Title:		Novel cross-stage solitarising effect of gregarious-phase adult desert locust (Schistocerca gregaria (Forskal)) pheromone on hoppers
Author(s):		Bashir MO; Hassanali A;
Address:		"ICIPE Field Station, P.O. Box 1213, Port Sudan, Sudan. yamagzoub2@yahoo.com"
Journal Title:		J Insect Physiol
Year:		2010
Volume:		20100211
Issue:		6
Page Number:		640 - 645
DOI:		10.1016/j.jinsphys.2010.01.012
ISSN/ISBN:		1879-1611 (Electronic) 0022-1910 (Linking)
Abstract:		"Previous studies had demonstrated stage differentiation in the cohesion (aggregation) pheromone systems of the desert locust, Schistocerca gregaria. In laboratory arena, the nymphal and adult stages responded aggregatively to their own pheromone, but dispersed evenly within the arena in the presence of the other. In the present study, we explored the effects of longer-term contact of field gregarious hopper bands and laboratory crowd-reared nymphs with the major constituent of the adult pheromone. During the first few days, hoppers in treated bands became relatively hyperactive. Over the next few days, their movements became random and they stopped marching as coherent groups, they started to roost for longer periods on vegetations, and they fragmented into smaller and smaller groupings and individuals. When attacked by birds, they demonstrated subdued levels of collective defensive behaviour compared to normal hoppers, and there were clear signs of increased predation and cannibalism at the roosting sites. In cage experiments, crowd-reared nymphs treated with the pheromone component became hyperactive, showed abnormal diel patterns and reduced feeding on plants but increased cannibalism. Our observations show that the major adult pheromone constituent has a solitarising effect on gregarious hoppers. The mechanism underlying this effect and the potential of the agent in desert locust control are discussed"
Keywords:		"Acetonitriles/pharmacology Animals Behavior, Animal/drug effects/*physiology Cannibalism Crowding Feeding Behavior/drug effects/physiology Grasshoppers/drug effects/*physiology Insect Hormones/physiology Life Cycle Stages/physiology Pheromones/*physiology;"
Notes:		"MedlineBashir, Magzoub O Hassanali, Ahmed eng Research Support, Non-U.S. Gov't England 2010/02/09 J Insect Physiol. 2010 Jun; 56(6):640-5. doi: 10.1016/j.jinsphys.2010.01.012. Epub 2010 Feb 11"