Development of Hymenolepis Diminuta in Its Definitive Host

Roberts, Larry S.

doi:10.1016/b978-0-12-058980-7.50010-5

Cited by 36 publications

(27 citation statements)

References 117 publications

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“…This implies that a change in the properties of the transport locus occurs with increasing adult age, as previously described for glucose by Henderson (1977) and for thymidine by Insler (1981). The position is, however, further complicated by the work of Starling & Roberts (in Roberts, 1980) who concluded that there were two uptake sites in adult H. diminuta, one of which was sensitive to K + . Inhibitions by K + were clearly demonstrable in 6-day-old worms but decreased in 10-and 20-day-old parasites.…”

Section: Changes In Membrane Permeability During Ontogeny Of Metacestmentioning

confidence: 80%

Ontogenetic changes in helminth membrane function

Arme

1988

Parasitology

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During their life-cycle many parasites experience a wide range of environments including free living and those provided by a variety of intermediate and final hosts. The nutritional requirements of parasites are met by physiological processes adapted to exploit the physicochemical characteristics provided by different hosts. In helminth parasites these adaptations are frequently expressed on the tegumentary surface. As an example of adaptations within the Trematoda, the control of monosaccharide transport in Proterometra sp. is described. Environmental sodium, although not directly involved in the uptake process, nevertheless regulates the expression of transport capabilities. In the Cestoda, the uptake of monosaccharides and amino acids is described for Hymenolepis diminuta. The metacestode of this tapeworm inhabits the blood system of an arthropod, and the adult the gut of a mammal. There are quantitative and qualitative differences in the amino acids and monosaccharides in these two environments and these are reflected in the transport mechanisms exhibited by the two forms of the life-cycle. In Echinococcus granulosus the transfer of amino acids, sugars and macromolecules across the membranes of hydatid cysts and protoscoleces is described. The major difference between these two stages in the life-cycle relates to the ability of hydatid cysts to absorb macromolecules, whereas protoscoleces are impermeable to these compounds. The potential for future work is emphasized.

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Section: Changes In Membrane Permeability During Ontogeny Of Metacestmentioning

confidence: 80%

Ontogenetic changes in helminth membrane function

Arme

1988

Parasitology

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“…3A). Such crowding effects are well known for tapeworms (Roberts 1980). If we assume that the effect on the host is proportional to the mass of worms in the host, an infection with only two worms would be expected to have an effect about two-thirds that measured in our experiment, indicating that our result can be generalized (at least in a qualitative sense) to a wide range of tapeworm intensities.…”

Section: Digestive Efficiencymentioning

confidence: 98%

Sublethal Parasites and Host Energy Budgets: Tapeworm Infection in White‐Footed Mice

Munger¹,

Karasov²

1989

Ecology

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One way to study a parasite's effect on the individual and population ecology of its host is to examine effects on the host's energy budget. A relatively innocuous effect of a gut parasite, such as decreased digestive efficiency, can potentially translate into an effect costly to host fitness, such as decreased reproduction, if other compensations (such as increased rate of food intake) do not occur. We found that infection by the tapeworm Hymenolepis citelli caused a 2% drop in dry—matter digestibility in host white—footed mice (Peromyscus leucopus). A crowding experiment indicated that this result should be applicable to a wide range of intensities of infection. However, we detected no compensation for this decreased digestive efficiency either in amount of food consumed or in mass change (which would indicate use of fat stores or changes in growth). In field experiments we used doubly labeled water to measure effects of tapeworms on field metabolic rate and water influx (potentially a measure of food intake rate), and temperature—sensitive transmitters to measure body temperature. We detected no compensations via these routes either. Our failure to detect compensations indicates that in the nonreproductive mice studied the decrease in digestive efficiency is not of sufficient importance to engender substantial compensations and is therefore unlikely to lead to fitness—altering effects. It is in reproductive animals or in animals subjected to food shortage that such effects would be expected.

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“…The survival and reproduction of Moniliformis are dependent on the carbohydrates liberated at different rates from the intestinal tract of the host during digestion and absorption (Nesheim, Crompton, Arnold et al, 1977. Absence or restriction of availability of dietary carbohydrates resulted in decreased establishment and growth of Hymenolepis diminuta (Keymer, Crompton, Singhvi, 1983;Roberts, 1980). However, the influence of carbohydrates in the host diet on nematodes has received less attention.…”

Section: Carbohydratementioning

confidence: 97%

The Influence of Host Diet and Fasting on Helminth Infection: review

Petkevičius¹

1998

Acta Zoologica Lituanica

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Development of Hymenolepis Diminuta in Its Definitive Host

Cited by 36 publications

References 117 publications

Ontogenetic changes in helminth membrane function

Ontogenetic changes in helminth membrane function

Sublethal Parasites and Host Energy Budgets: Tapeworm Infection in White‐Footed Mice

The Influence of Host Diet and Fasting on Helminth Infection: review

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