The role of carbohydrates in the biology of cestodes. VIII. Some conclusions and hypotheses

Read, Clark P.

doi:10.1016/0014-4894(59)90030-x

Cited by 104 publications

(32 citation statements)

References 27 publications

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“…The numbers of some helminths, especially tapeworms, are positively correlated with food intake by the host, and these helminths are often lost when hosts are malnourished (Read 1959). Some specific nutrient deficiencies affect parasites more than the hosts.…”

Section: Helminths and Nutritionmentioning

confidence: 98%

Population regulation: a dynamic complex of interactions

Holmes¹

1995

Wildl. Res.

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Looking for a single, consistent cause for population regulation is not only wishful thinking, but also hinders our efforts to understand population dynamics. Population regulation is not only multifactorial, but interactions among those factors are important; single-factor experiments can miss important interactions. In addition, the ecological context constantly changes, so that regulatory processes track a moving target; experiments can have different results if the context differs.

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Section: Helminths and Nutritionmentioning

confidence: 98%

Population regulation: a dynamic complex of interactions

Holmes¹

1995

Wildl. Res.

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“…It has long been known that some tapeworms have a physiological requirement for carbohydrate (Read, 1959) and density-dependent constraints on the size of adult H. diminuta have been thought to result primarily from intraspecific competition for this resource (Read & Phifer, 1959;Holmes, 1959;Roberts, 1961). The size of H. diminuta, as measured by dry weight, can be related very closely to the amount of carbohydrate consumed by the host and its availability for utilization by the worm population in the small intestine (Crompton & Keymer, unpublished observations).…”

Section: (In the Press)mentioning

confidence: 99%

Density-dependent mechanisms in the regulation of intestinal helminth populations

Keymer

1982

Parasitology

145

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The regulation of helminth populations tends to occur primarily as a result of limitations imposed on the build up of parasite subpopulations within individual hosts (Anderson & May, 1979; May & Anderson, 1979). Considering the relevance of these factors to the success or otherwise of intestinal helminth control programmes, it is perhaps surprising that more information is not yet available concerning the particular mechanisms which may be responsible, and in particular, the population consequences of the immune responses which such parasites may precipitate. Density-dependence in a single rate parameter, if operative over the naturally observed numerical range, is sufficient to regulate parasite population flow throughout the life-cycle, whether direct or indirect (Anderson, 1976). For the genera given in Table 1, this could be provided by the observed pattern of parasite mortality and/or fecundity. It is of interest to note, however, that circumstantial evidence cited in the Table suggests that each of the 6 genera is also potentially able to induce host mortality under certain conditions. Whether this acts in a density-dependent manner in natural infections is almost entirely unknown. Rapid reproduction may be of great selective advantage to intestinal helminths, even if it is necessarily accompanied by pathogenicity (see Anderson, 1981). If the manner in which this pathogenicity acts in any way enhances the stability of the host-parasite interaction, then perhaps it may have contributed to the selection pressures which have led so many genera to continue to break the rules of the ‘well-adapted’ parasite (see, for example, Noble & Noble, 1971).

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“…Of the carbo-hydrates, however, most species can utilize only certain monosaccharides (Read, 1959) (Table 12.9). In Hymenolepis diminuta, for example, only glucose and galactose are actively absorbed, whereas fructose, lactose, maltose, and trehalose are not.…”

Section: Carbohydrate Metabolismmentioning

confidence: 99%

Eucestoda: The True Tapeworms

Cheng

1986

General Parasitology

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The role of carbohydrates in the biology of cestodes. VIII. Some conclusions and hypotheses

Cited by 104 publications

References 27 publications

Population regulation: a dynamic complex of interactions

Population regulation: a dynamic complex of interactions

Density-dependent mechanisms in the regulation of intestinal helminth populations

Eucestoda: The True Tapeworms

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