Document Detail

The role of internal pressure and muscle activation during locust oviposition.
MedLine Citation:
PMID:  12770260     Owner:  NLM     Status:  Publisher    
The oviposition of female locusts is a complex behaviour that includes a dramatic extension of the abdomen. The role of internal pressure during oviposition was investigated by monitoring the intra-tracheal pressure and the activity of selected longitudinal muscles, while movements of the abdomen were visualised with a video imaging system. Locust oviposition consists of a sequence of four distinct phases: (i) probing the substrate and digging without elongation of the abdomen, (ii) longitudinal extension of the abdomen up to four times its normal length, (iii) laying packages of eggs while (iv) gradually withdrawing the abdomen. During extension, neurograms and myograms of selected longitudinal muscles revealed a decreased level of activity. When the abdomen retracted to its normal length, muscle activity re-appeared. In phases two and three, rising internal pressure prevented the abdomen from slipping back when the valves released their lateral grip from the substrate. Locking the genital segments in the hole by relative bending kept the abdomen in place when producing foam or laying eggs. Intra-abdominal pressure, therefore, is not the main cause of abdominal extension, but rather maintains extension when no mechanical locking in the hole prevents the abdomen from elastic retraction.
U Rose; G Seebohm; R Hustert
Publication Detail:
Journal Detail:
Title:  Journal of insect physiology     Volume:  46     ISSN:  1879-1611     ISO Abbreviation:  J. Insect Physiol.     Publication Date:  2000 Jan 
Date Detail:
Created Date:  2003-May-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985080R     Medline TA:  J Insect Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  69-80     Citation Subset:  -    
I. Zoologisches Institut, Universität Göttingen, Berlinerstrasse 28, 37073, Göttingen, Germany
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