Visual evaluation and recognition of hosts by the tick parasitoid, Ixodiphagus hookeri (Hymenoptera: Encyrtidae)

Publication Type

Journal Article

Journal Name

Physiological Entomology

Publication Date

1-1-1992

Abstract

Abstract Expulsion of the tsetse larva from the uterus of the female is preceded by 1–2 h of rhythmic pulses of haemolymph pressure that can be detected using a barographic technique. At first baseline pressure is maintained and all pulses are positive in relation to baseline. Then, about 1 h before parturition, baseline pressure increases, pulse intensity increases, and the pulses become both positive and negative in relation to baseline. Each pulse correlates with ‘bobbing’ action of the female's proboscis, the only external indication of this internal activity. A single large pressure pulse is observed at parturition, and thereafter the pressure level returns to the original baseline and pulsing action ceases. Around the presumptive time of ovulation, 1–2 h after parturition, another series of pressure pulses is observed. The pulses are the likely consequence of coordinated waves of muscular contraction that are essential preparation for successful parturition and ovulation. 1992 Royal Entomological Society

Keywords

Glossina morsitans, haemolymph pressure, ovulation, parturition, Tsetse

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