| Phase-related body-color polyphenism in hatchlings of the desert locust, Schistocerca gregaria: re-examination of the maternal and crowding effects. | |
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MedLine Citation:
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PMID: 16997320 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The mechanism controlling the body color of hatchlings was studied for the desert locust, Schistocerca gregaria. A pheromonal factor secreted by gregarious female adults into the foam plugs of egg pods has been suggested to cause darkening in their progeny. We re-examined the role of this maternal factor by washing or separating eggs at deposition. Eggs produced by crowd-reared female adults were washed with saline or separated individually without being washed immediately after deposition and the body color of the hatchlings from them was compared with that from the eggs unwashed and kept in the egg pod until hatching. Most hatchlings were dark and no significant difference was found in the proportions of dark- and light-colored hatchlings between the treatments and controls. Likewise, eggs separated before the foam plug deposition produced dark-colored hatchlings as in the un-separated controls. These results demonstrated that neither washing nor separation of eggs at deposition affected the hatchling body coloration. The variation in hatchling body color was correlated closely to the body weight at hatching, indicating that hatchling body color had been determined maternally. Green hatchlings reared under crowded conditions remained green until the second stadium at which black patterns were induced. It was concluded that body color at hatching has been determined maternally and crowding during the first nymphal stadium influences nymphal body color but its effect is not manifested until the second stadium. The present study casts doubts on the presence of a recently suggested pheromonal factor on the color of the hatchlings. |
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Authors:
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Seiji Tanaka; Koutaro Maeno |
Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't Date: 2006-09-25 |
Journal Detail:
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Title: Journal of insect physiology Volume: 52 ISSN: 0022-1910 ISO Abbreviation: J. Insect Physiol. Publication Date: 2006 Oct |
Date Detail:
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Created Date: 2006-10-30 Completed Date: 2007-01-24 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 2985080R Medline TA: J Insect Physiol Country: England |
Other Details:
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Languages: eng Pagination: 1054-61 Citation Subset: IM |
Affiliation:
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Laboratory of Insect Life Cycles and Physiology, Insect Interaction Unit, NIAS at Ohwashi, Tsukuba, Ibaraki 305-8634, Japan. stanaka@affrc.go.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Body Weight Grasshoppers / growth & development, physiology* Larva / growth & development, physiology Ovum / physiology* Pigmentation / physiology* Population Density |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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