Kinetics of proglottid formation, maturation and shedding during development of <i>Hymenolepis nana</i>

Kumazawa, Hideo; Suzuki, Naohiro

doi:10.1017/s0031182000050447

Cited by 7 publications

(12 citation statements)

References 29 publications

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“…The reason type 1 and type 2 worms were present at spawning time is not known, but it is not strictly related to worm size, as specimens of all three types were found in the range 5.7-72.9 mg . Moreover, maturation of other cestodes is independent of size (Roberts 1961;Kumazawa and Suzuki 1983). The presence of type 1 and type 2 worms indicates that in addition to extensive worm mortality that presumably occurs between egg and plerocercoid stage, there is a further loss of biotic potential within the definitive host.…”

Section: Possible Causes Of Individual Variabilitymentioning

confidence: 99%

Individual variability in reproductive success of Triaenophorus crassus Forel (Cestoda: Pseudophyllidea), with comments on use of the Lorenz curve and Gini coefficient

Shostak¹,

Dick²

1987

Can. J. Zool.

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1987. Individual variability in reproductive success of Triaenophorus crassus Forel (Cestoda: Pseudophyllidea), with comments on use of the Lorenz curve and Gini coefficient. Can. J. Zool. 65: 2878-2885. Maturity, mass, and lifetime fecundity were detemined in individual Triaenophorus crassus from spawning pike (Esox lucius) from Falcon Lake, Manitoba. Only 33% of worms contained eggs, and only 73% of these could release their eggs (up to 4 400 000 per worm). Inequalities in mass and fecundity were quantified using Lorenz curves and Gini coefficients calculated for worms pooled across hosts, and separately for worms in each host. Inequalities in mass were correlated with, but always lower than, corresponding inequalities in fecundity, although inequalities in fecundity and mass were more similar at high infection intensities. Consequently, inequalities in worm mass did not provide an accurate estimate of inequalities in reproductive success but could be used as an indirect index for comparative purposes. These inequalities can potentially modify parasite transmission. Ten percent of worms accounted for 85% of all parasite fecundity and, as a result of a contagious distribution of worms among pike and a lack of detectable intensity-dependent effects on parasite fecundity, 55% of worm eggs came from 10% of spawning pike. Worm numbers and distribution among hosts, maturity, and inequalities in mass and fecundity were consistent over 3-4 consecutive years, indicating that these inequalities are a normal component of the life cycle. The concentration of parasite fecundity in relatively few worms or hosts suggests that the population dynamics of T. crassus may be affected by short-term changes in parasite genotype, host activity patterns, or mortality of the few heavily infected hosts. SHOSTAK, A. W., et DICK, T. A. 1987. Individual variability in reproductive success of Triaenophorus crassus Forel (Cestoda:Pseudophyllidea), with comments on use of the Lorenz curve and Gini coefficient. Can. J. Zool. 65 : 2878-2885. La maturitk, la masse et la feconditk totale ont pu &tre dkterminkes chez des individus de Triaenophorus crassus, parasites de brochets (Esox lucius) captures sur les frayitres du lac Falcon, au Manitoba. Seulement 33% des vers portaient des oeufs et seulement 73% de ceux-la pouvaient les liberer Uusqu'a 4 400 000 oeufs par individu). Les differences de masse et de fecondite des vers ont kt6 quantifiees, tant chez l'ensemble des n6tes que chez un seul hbte, a l'aide de courbes de Lorenz et de coefficients de Gini. Les differences de masse sont toujours en corrklation avec les diffkrences de feconditk qui sont toutefois plus importantes; les diffkrences de masse et de feconditk sont cependant du m&me ordre au cours des infections graves. Consequemment, les differences de masse ne mesurent pas adkquatement les diffkrences dans le succes de la reproduction; elles peuvent neanmoins servir d'indice indirect dans des ktudes comparatives. Ces diffkrences peuvent ini'luer sur la transmission des parasites. Dix pour...

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Section: Possible Causes Of Individual Variabilitymentioning

confidence: 99%

Individual variability in reproductive success of Triaenophorus crassus Forel (Cestoda: Pseudophyllidea), with comments on use of the Lorenz curve and Gini coefficient

Shostak¹,

Dick²

1987

Can. J. Zool.

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“…All measurements were on preparations obtained from the Series I experiments of a previous study (Kumazawa & Suzuki, 1983). Essentially, the Series consisted of 2 experiments of an identical design.…”

Section: Methodsmentioning

confidence: 99%

“…Preparations of 507 worms, obtained from a total of 180 mice, comprised the whole Series. For further details, see Kumazawa & Suzuki (1983).…”

Section: Methodsmentioning

confidence: 99%

“…On day 2, most of the worms have not yet formed proglottides. On day 8, some worms begin to shed the most posterior proglottides, but the number shed is still few (Kumazawa & Suzuki, 1983). Shedding of proglottides has occurred in all worms by the end of day 9.…”

Section: Methodsmentioning

confidence: 99%

“…An alternative approach to understanding strobilisation in the true tapeworms would be to describe the growth of the organism in terms of the production and growth of its component proglottides. Some information is available concerning the rate of proglottis production in various Hymenolepis spp., including H. nana (Schiller, 1959;Roberts, 1961;Jones & Tan, 1971;Ghazal & Avery, 1974;Kumazawa & Suzuki, 1983;Henderson & Hanna, 1987). Growth of individual proglottides, on the other hand, has never been studied, although the growth of such forms as Glaridacris laruei (Fischthal, Carson & Vaught, 1982) and Echinococcus granulosus (Smyth, 1967) might approximate to the growth of single proglottides.…”

Section: Introductionmentioning

confidence: 99%

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Growth of single proglottides during early adult development of Hymenolepis nana

Kumazawa¹,

Fairweather

1989

Parasitology

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The growth of individual proglottides of Hymenolepis nana has been studied by measuring the width and length of the proglottides between days 3 and 8 post-infection in mice. Two sets of measurements were obtained. The first involved proglottides immediately posterior to the point of proglottis formation and proglottides at particular stages of development. For the second set, measurements were made of proglottides at certain positions in the worm, specifically the 20th, 100th and 200th proglottides, as counted from the posterior end of the worm. For proglottides at different stages in development, the width of a particular stage was greater in the later days of infection, while the length was almost constant. The length of newly-formed proglottides varied only slightly with time despite differences in the width and in the 3-fold increase in proglottis production that occurs between days 3 and 8 post-infection. The width of the 20th, 100th and 200th proglottides followed parallel growth curves that coincided with each other after an appropriate shift along the time axis. The more anterior the position of the proglottis, the greater was the width at the time of proglottis formation, and so its growth began later on the common growth curve. Growth in length of the 20th proglottis was at first faster than the 100th and 200th proglottides, but later slowed down to a level comparable with them, and the growth curves for the length of the three proglottides were very similar to each other. The rates of growth in the volume of the three proglottides were also estimated. The results are also discussed in relation to other approaches to the study of tapeworm growth and to factors that may be responsible for the growth patterns observed.

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Hymenolepis nana (cestoda: cyclophyllidea): migration, growth and development in the laboratory mouse

Henderson

Hanna

1987

International Journal for Parasitology

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Kinetics of proglottid formation, maturation and shedding during development of Hymenolepis nana

Cited by 7 publications

References 29 publications

Individual variability in reproductive success of Triaenophorus crassus Forel (Cestoda: Pseudophyllidea), with comments on use of the Lorenz curve and Gini coefficient

Individual variability in reproductive success of Triaenophorus crassus Forel (Cestoda: Pseudophyllidea), with comments on use of the Lorenz curve and Gini coefficient

Growth of single proglottides during early adult development of Hymenolepis nana

Hymenolepis nana (cestoda: cyclophyllidea): migration, growth and development in the laboratory mouse

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