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J Insect Physiol

Title:		"Maternal effects on progeny body size and color in the desert locust, Schistocerca gregaria: examination of a current view"
Author(s):		Tanaka S; Maeno K;
Address:		"Laboratory of Insect Life Cycles and Physiology, Insect Interaction Units, National Institute of Agrobiological Sciences at Ohwashi, Ohwashi 1-2, Tsukuba, Ibaraki 305-8634, Japan. stanaka@affrc.go.jp"
Journal Title:		J Insect Physiol
Year:		2008
Volume:		20071231
Issue:		3
Page Number:		612 - 618
DOI:		10.1016/j.jinsphys.2007.12.010
ISSN/ISBN:		0022-1910 (Print) 0022-1910 (Linking)
Abstract:		"Hatchling body color and size of the desert locust, Schistocerca gregaria, are determined by the population density of the mothers during their reproductive period. Smaller green hatchlings are produced by adults at low population density (solitarious conditions) and larger dark hatchlings at high population density (gregarious conditions). One claim states that a pheromonal factor secreted by gregarious mothers into foam plugs of egg pods induces darkening in hatchlings. Previous research suggests that the foam factor can be removed by separating eggs individually within 1h of deposition, causing presumptive gregarious eggs to hatch without darkening. The present study re-examined this claim and possible factors that have been proposed which could account for the difference between our results and those reported earlier. Early separation was performed on eggs with a low mortality rate. The results showed that the egg separation did not increase the incidence of green hatchlings. Once chorionated in the ovary, eggs remained unchanged in size until the second day after oviposition in either isolated or crowded locusts. This and other results suggest that the phase-dependent differences in body size and color of hatchlings are established in the ovary and that modifications by the accessory gland factor either in the oviduct or after deposition are unlikely"
Keywords:		Animals Body Size/*physiology Female Grasshoppers/*physiology Male Ovary/physiology Oviparity/*physiology Ovum/physiology Pheromones/*physiology Pigmentation/*physiology Population Density Silicon Dioxide;
Notes:		"MedlineTanaka, Seiji Maeno, Koutaro eng Research Support, Non-U.S. Gov't England 2008/02/06 J Insect Physiol. 2008 Mar; 54(3):612-8. doi: 10.1016/j.jinsphys.2007.12.010. Epub 2007 Dec 31"