Effects of [His(7)]-corazonin on the phase state of isolated-reared (solitarious) desert locusts,Schistocerca gregaria |
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Authors: | Hoste B Simpson S J Tanaka S Zhu D -H De Loof A Breuer M |
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Institution: | a Zoological Institute, K.U. Leuven, Naamsestraat 59, 3000 Leuven, Belgium b University of Oxford, Department of Zoology and University Museum of Natural History, South Parks Road, Oxford OX1 3PS, UK c Institute of Insect and Animal Sciences, Tsukuba, Ibaraki 305-8634, Japan |
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Abstract: | His7]-corazonin is a neuropeptide produced in the pars lateralis of the brain. It is stored in the corpora cardiaca and probably released from there. The only well-documented effect in locusts is increased melanization of the cuticle. We investigated whether this hormone might also be causally related to changes in behavior and morphometrics that, like melanization, occur during crowding-induced gregarization. Solitary fourth-instar nymphs of Schistocerca gregaria (Forsk.) were injected thrice with 1 nmol His7]-corazonin. After molting to the 5th stadium their behavioral phase state was measured in an arena assay and analyzed using multiple logistic regression analysis. The hormone was found not to induce behavioral phase changes. Upon reaching adulthood, morphometrics shifts occurred towards values typical for crowd-reared and regregarized animals. Our results thus indicate that His7]-corazonin is not involved in behavioral gregarization but may participate in morphometrical phase change. |
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Keywords: | Locusts Schistocerca gregaria Insect neuropeptides Phase transition Gregarization Melanization Pigmentation |
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