摘要:

ABSTRACT.The activity of lectins in different species of tsetse was comparedin vivoby the time taken to remove all trypanosomes from the midgut following an infective feed andin vitroby agglutination tests. Teneral maleGlossina pallidipesAusten,G.austeniNewstead andG.p.palpalisR‐D. removed 50% of allTrypanosoma brucei rhodesienseStephens&Fantham infections within 60 h. A ‘refractory’ line ofG.m.morsitansWestwood took 170 h to kill 50% infections while a ‘susceptible’ line of the same species failed to kill 50%. Agglutination tests with midgut homogenates showed differences between fly stocks which accorded with differences in rate of trypanosome killingin vivo.Flies fed before an infective feed were able to remove trypanosomes from their midguts more quickly than flies infected as tenerals. Increasing the period of starvation before infection increased the susceptibility to trypanosome infection of non‐teneral flies. Teneral flies showed little agglutinating activityin vitro, suggesting that lectin is produced in response to the bloodmeal.Feeding flies before infection also abolished the differences in rate of trypanosome killing found between teneral ‘susceptible’ and ‘refractory’G.m.morsitans, suggesting that maternally inherited susceptibility to trypanosome infection is a phenomenon limited to teneral flies.Electron micrographs of midguts ofG.m.morsitanssuggest that pro‐cyclic trypanosomes are killed by cell lysis, presumably the result of membrane damage ca

ISSN:0269-283X    

DOI:10.1111/j.1365-2915.1989.tb00477.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

ABSTRACT.Seasonal changes in the mean size of tsetse,Glossina pallidipesAusten, as indicated by wing vein length, were monitored during 1983‐86 at Nguruman, southwestern Kenya. Changes in size of nulliparous females and wing fray category 1 males were shown to be correlated with the relative humidity 2 months before they were captured. Soil temperature when flies were in the pupal stage had much less effect. Size dependent mortality was demonstrated, with the mean size of flies emerging from pupae significantly less than that of field‐caught flies. This mortality must occur at emergence, since there was no evidence of size‐dependent mortality once the flies became available to the trap. Size was correlated with density‐independent mortality acting on the parent population 2 months previously. It might therefore be possible to use size as an index of the intensity of such mortality. This could be useful when assessing the level of additional mortality required to suppress tsetse popu

ISSN:0269-283X    

DOI:10.1111/j.1365-2915.1989.tb00478.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

ISSN:0269-283X    

DOI:10.1111/j.1365-2915.1989.tb00480.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

ISSN:0269-283X    

DOI:10.1111/j.1365-2915.1989.tb00481.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY