Mating, ovulation and oöcyte development in Glossina morsitans

Saunders, D. S.

doi:10.1016/0035-9203(70)90241-5

Cited by 11 publications

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“…Certainly, ovulation in Rhodnius is the result of muscular contractions in the oviducts brought about by a myotropin released from the mnc (Davey, 1967). Larviposition and ovulation in Glossina are known to occur virtually simultaneously (Saunders, 1970;Foster, 1972). The reduction in larval growth and abortion observed by Foster (1972) as a result of mnc ablation may, of course, be a result of the possible involvement of the mnc in the myriad of metabolic phenomena which are known to contribute to the formation of milk (Tobe & Davey, 1974, and in press).…”

Section: Discussionmentioning

confidence: 99%

“…It is known that virgin and mated females of G. morsitans mature their first oocyte at the same rate, while it is the growth of the second oocyte in virgins which is inhibited (Saunders, 1970). Since ovulation in virgins is delayed (Saunders, 1970;Saunders & Dodd, 1972), and since in other flies the growth of ovaries may be inhibited by the presence of mature eggs (Adams et al, 1968;Meola & Lea, 1972), there is thus no evidence so far that the ca is necessarily involved in the control of oocyte growth. Moreover, Sarcophaga does not depend on the ca as the source of a gonadotropin, but as a source of a hormone which controls the general level of protein synthesis (Wilkens, 1969).…”

Section: Discussionmentioning

confidence: 99%

“…Tsetse flies reproduce by adenotrophic viviparity, undergoing successive cycles of pregnancy, in each of which a single egg is ovulated into the uterus and hatches as a larva which grows to maturity nourished by the secretions of the milk gland of the mother (Roubaud, 1909). When the larva is mature, parturition occurs, and ovulation ensues almost immediately (Saunders, 1970;Foster, 1972). The nutritional demands of the larva are reflected in a secretory cycle in the milk gland (Tobe et al, 1973).…”

Section: Introductionmentioning

confidence: 99%

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Changes in the neurosecretory cells, corpus cardiacum and corpus allatum during pregnancy in Glossina austeni Newst. (Diptera, Glossinidae)

Ejezie

Davey

1974

Bull. Entomol. Res.

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The neurosecretory cells of the pars intercerebralis, the corpus cardiacum and the corpus allatum were examined in histological sections of Glossina austeni Newst. females fixed at daily intervals over the first two cycles of pregnancy. Two groups of neurosecretory cells corresponding to the lateral and median cells of other insects were recognised. The median neurosecretory cells were found to undergo cyclic changes of net synthesis and net release, which were correlated with ovulation and larviposition. The single ellipsoid corpus allatum undergoes cyclic changes in volume and histological appearance which are correlated with changes in the volume of the milk gland.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Changes in the neurosecretory cells, corpus cardiacum and corpus allatum during pregnancy in Glossina austeni Newst. (Diptera, Glossinidae)

Ejezie

Davey

1974

Bull. Entomol. Res.

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“…The ovaries of most oviparous Diptera contain dozens of ovarioles with some or all containing vitellogenic oocytes at the same time 33 . In Glossina, each ovary contains two ovarioles with only one mature oocyte completing development per gonotrophic cycle 8,34,35 (Figure 4A+B). Cross section through the developing ovarian follicles shows the fully developed primary follicle with the tertiary ovarian follicle in close association inside the right ovary ( Figure 4C).…”

Section: Ovarian Reduction and Oviduct Folding Reduce Constraints On mentioning

confidence: 99%

“…In Glossina, physical and chemical mating stimuli are required to initiate ovulation and activate other post mating changes including initiation of sexual refractoriness, accelerated oocyte development, increased host seeking/blood feeding and ingestion of increased blood meal volumes 27,34,36,39,40 . Mating involves the transfer of a large volume of male accessory gland derived proteins and biochemicals which form a well-defined structure called a spermatophore in the uterus of the female [41][42][43][44] .…”

Section: Ovarian Reduction and Oviduct Folding Reduce Constraints On mentioning

confidence: 99%

Interpretation of the morphological adaptations associated with viviparity in the Tsetse fly (Glossina morsitans) by three dimensional analysis

Attardo

Tam

Parkinson

et al. 2020

Preprint

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Tsetse flies (genus Glossina), the sole vectors of African trypanosomiasis, are distinct from other disease vectors, and most other insects, due to dramatic evolutionary adaptations required to support their unique life history. These morphological and physiological adaptations are driven by demands associated with their strict dietary and reproductive requirements. Tsetse reproduce by obligate viviparity which entails obligate intrauterine larval development and provisioning of nutrients for the developing larvae. Viviparous reproduction reduces reproductive capacity/rate which also drives increased inter-and intra-sexual competition. This work describes three-dimensional (3D) analysis of viviparity associated morphological adaptations of tsetse female reproductive tract as well as that of male seminal secretions by phase contrast microcomputed tomography (pcMicroCT). Structural features of note include abdominal modifications facilitating the extreme abdominal distention required during blood feeding and pregnancy; abdominal and uterine musculature required for parturition of developed larvae; reduction of ovarian structure and capacity; structural features of the male seminal spermatophore that enhance sperm delivery and inhibition of insemination by competing males; uterine morphological features facilitating expansion and contraction before, during and after pregnancy; analysis of structural optimizations of the milk gland facilitating nutrient incorporation and transfer into the uterus. The use of pcMicroCT provides unprecedented opportunities for examination and discovery of internal morphological features not possible with traditional microscopy techniques and new opportunities for comparative morphological analyses over time and between species.3

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Some effects of mating in female tsetse, Glossina austeni newst

Ejezie

Davey

1977

J. Exp. Zool.

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Virgin females of G. austeni were mated at carefully chosen physiological states to determine the effect of mating on ovulation, neurosecretion and blood meal size. The results suggest that ovulation and larviposition are controlled by neurosecretion, and that the release of neurosecretion requires both a mating stimulus and the presence of a mature egg in one of the ovarioles. The mating stimulus was also found to lead to an increase in blood meal size. Unmated female flies do not ovulate and their mature eggs eventually disintegrate. Virgin blood meal sizes remain relatively low.

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Mating, ovulation and oöcyte development in Glossina morsitans

Cited by 11 publications

References 0 publications

Changes in the neurosecretory cells, corpus cardiacum and corpus allatum during pregnancy in Glossina austeni Newst. (Diptera, Glossinidae)

Changes in the neurosecretory cells, corpus cardiacum and corpus allatum during pregnancy in Glossina austeni Newst. (Diptera, Glossinidae)

Interpretation of the morphological adaptations associated with viviparity in the Tsetse fly (Glossina morsitans) by three dimensional analysis

Some effects of mating in female tsetse, Glossina austeni newst

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