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- W2014970001 abstract "The life history data available for two species of hookworm that commonly infect humans, Necator americanus and Ancylostoma duodenale, were compiled. The data were then analyzed in the light of two ecological theories: r and K selection and the constraints of body size on reproduction. Field and laboratory experiments have shown that N. americanus is smaller than A. duodenale and produces fewer but larger eggs. The former is less virulent but the latter is hardier during its free-living stages and can infect orally as well as via the skin. Such species differences reflect the greater opportunism of A. duodenale and the greater degree of accommodation to the human host of N. americanus. A. duodenale optimizes the probability of finding a host and invading it, while N. americanus optimizes the chance of survival once within the host. On the basis of population density, longevity, and fecundity, N. americanus is the more K selected of the two species. However, the theory of r and K selection alone is insufficient to explain the different adaptations of closely related and sympatric parasites with complex life histories. N. americanus does not show greater competitive ability in its freeliving stage, and its mortality is not demonstrably more dependent on density than A. duodenale, as would be predicted by r and K selection theory as presently applied. Epidemiological differences between the two hookworm species are related to such life history parameters as lifespan, fecundity, age-specific survivorship, and density relationships." @default.
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- W2014970001 title "Necator americanus and Ancylostoma duodenale: Life history parameters and epidemiological implications of two sympatric hookworms of humans" @default.
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- W2014970001 doi "https://doi.org/10.1016/0014-4894(78)90078-4" @default.
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