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J Comp Physiol A Neuroethol Sens Neural Behav Physiol

Title:		Serotonin modulates worker responsiveness to trail pheromone in the ant Pheidole dentata
Author(s):		Muscedere ML; Johnson N; Gillis BC; Kamhi JF; Traniello JF;
Address:		"Department of Biology, Boston University, Boston, USA. mario@bu.edu"
Journal Title:		J Comp Physiol A Neuroethol Sens Neural Behav Physiol
Year:		2012
Volume:		20111202
Issue:		3
Page Number:		219 - 227
DOI:		10.1007/s00359-011-0701-2
ISSN/ISBN:		1432-1351 (Electronic) 0340-7594 (Linking)
Abstract:		"As social insect workers mature, outside-nest tasks associated with foraging and defense are typically performed at higher frequencies. Foraging in ants is often a pheromonally mediated collective action performed by mature workers; age-dependent differences in olfactory response thresholds may therefore proximately regulate task repertoire development. In the ant Pheidole dentata, foraging activity increases with chronological age in minor workers, and is chemically controlled. The onset of foraging in minor workers is accompanied by marked neuroanatomical and neurochemical changes, including synaptic remodeling in olfactory regions of the brain, proliferation of serotonergic neurons, and increased brain titers of monoamines, notably serotonin. We examined the linkage of serotonin and olfactory responsiveness by assaying trail-following performance in mature P. dentata minor workers with normal serotonin levels, or serotonin levels experimentally lowered by oral administration of the serotonin synthesis inhibitor alpha-methyltryptophan (AMTP). By assessing responsiveness to standardized pheromone trails, we demonstrate that trail-following behaviors are significantly reduced in serotonin-depleted workers. AMTP-treated individuals were less likely to initiate trail following, and oriented along pheromone trails for significantly shorter distances than untreated, similar-age workers. These results demonstrate for the first time that serotonin modulates olfactory processes and/or motor functions associated with cooperative foraging in ants"
Keywords:		Animal Communication Animals Ants/*physiology Appetitive Behavior/*physiology Neurons/drug effects/*metabolism Pheromones/*metabolism Serotonin/*metabolism Tryptophan/analogs & derivatives/pharmacology;
Notes:		"MedlineMuscedere, Mario L Johnson, Natalie Gillis, Brendan C Kamhi, J Frances Traniello, James F A eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Germany 2011/12/03 J Comp Physiol A Neuroethol Sens Neural Behav Physiol. 2012 Mar; 198(3):219-27. doi: 10.1007/s00359-011-0701-2. Epub 2011 Dec 2"