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Title: Studies on flight muscle polymorphism in Corixidae hemiptera-Heteroptera
Author: Young, Euan Cameron
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1963
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All British Corixidae, with the possible exception of Hesperocorixa and Callicorixa have at least two forms which differ in their ability to fly. In most species the difference, depends on the degree of development of the flight-musculature but in the spedies of Cymatia and Micronecta the wings are also modified. The present study considered only flight-muscle polymorphic species. In these the flightless-form is generally less pigmented, has soft, unpigmented phragmata and the flight-musculature remains in the newly-moulted condition. The two forms are identical at the time of the final moult. In one species the flightless-form is able to develop the musculature to the normal condition at any time in the adult stage but in the others the two forms are stabilized shortly after moulting. There is a main annual generation and a partial second generation in most species in this area. In the field populations the first adults of the main Generation are invariably flightless but those developing later are of either form. It is likely that the development of the forms is environmentally determined favourable conditions giving rise to the flightless-form. Temperature and food are likely factors and temperatures over 20°C cause the development of normal musculature in larvae within aquaria in the laboratory. It is possible to show that the flightless-form has some advantage over the normal-form in survival and fecundity and it is suggested that it is more efficient.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available