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Biomedical subjects

C F Curtis

Publications and source records attributed to C F Curtis.

At least 163 records · Page 9Linked to original sources
PubMed1975

Male-linked translocations and the control of insect pest populations.

Published data on an experimental release of Culex pipiens carrying a male-linked translocation are re-examined and it is shown that the steady decline in translocation frequency after termination of releases agrees with theoretical expectations, because of the selective disadvantage of translocation heterozygote males. Systems based on negative heterosis or meiotic drive are considered whereby it might be possible to prolong the population control which would be achieved by a short term release.

Animals↗
PubMed1974

Population replacement in Culex fatigens by means of cytoplasmic incompatibility. Laboratory experiments with non-overlapping generations.

Bidirectional cytoplasmic incompatibility in the Culex pipiens complex appears to provide a mechanism for the replacement of a wild population by a strain refractory to filaria or a strain made partly sterile by a translocation. As a preliminary test of the feasibility of the replacement process, various ratios of strains with the cytoplasm of either Delhi or Paris, which are bidirectionally incompatible, were tested in laboratory cages. Where one strain was marked with the ruby-eye gene, this strain always declined in frequency in the next generation. In experiments in which the Paris strain was marked with a male-linked translocation complex, after 2-4 generations of breeding there was complete elimination of either the Paris or the Delhi type depending, as expected, on the relative frequencies of the two types with which the population began. In one experiment a type with Paris cytoplasm devoid of the translocation was found. This type increased in frequency in succeeding generations. The possible causes of origin of this type and its relevance to the practical use of the replacement principle are discussed.

Animals↗
PubMed1972

Productivity of Glossina morsitans morsitans Westwood maintained in the laboratory, with particular reference to the sterile-insect release method.

Glossina morsitans is of great economic importance in Africa and if a mass-rearing project were to be undertaken with a view to control by the release of sterilized males it would be necessary to know the productivity that could be obtained from this species in the laboratory. Data for life tables and age-specific fecundity schedules of G. m. morsitans fed on goats or lop-eared rabbits are used to calculate outputs of viable pupae or of young adult males that would be available for disposal.For control by the sterile-male method, it is likely that pupae bred in captivity would be the organisms of choice for field release. The weekly output of viable males could be 18-25% of the total adult stock. Some implications of these findings are discussed.

Animals↗