Development and growth of parasites depend on resources provided by the host and the parasite's ability to use them. Identifying specific costs incurred by the host provides insight for assessment of parasite energy budgets, which differ among taxa and ontogenetic stages. Data from this study were analyzed using an accelerated failure-time model with intensity as a covariate. Results indicated significantly reduced survival of amphipods, Hyalella azteca, infected with the acanthocephalan Corynosoma constrictum compared with uninfected controls. Male and female amphipod survivorship and infection intensity did not differ; however, amphipods with high-intensity infections (>16 larvae) died earlier compared with amphipods with low-intensity infections (<3 larvae). The majority of infected amphipods died between 12 and 24 days postexposure, a period of rapid larval development. It is hypothesized that host death may be due either to an increase in overall larval nutritional demands or to parasite-mediated depletion of a specific host substance. Results from this study suggest that developing C. constrictum satisfies energy requirements by depriving amphipod hosts of resources normally used for somatic growth and maintenance.
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August 2006
INVERTABRATE–PARASITE RELATIONSHIPS|
August 01 2006
VIRULENCE OF CORYNOSOMA CONSTRICTUM (ACANTHOCEPHALA: POLYMORPHIDAE) IN HYALELLA AZTECA (AMPHIPODA) THROUGHOUT PARASITE ONTOGENY
Laura M. Duclos;
Laura M. Duclos
Department of Mathematics and Statistics, 810 Old Hardin Center, University of Nebraska-Lincoln, Lincoln, Nebraska 68583. laura.duclos@gmail.com
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Bradford J. Danner;
Bradford J. Danner
Department of Mathematics and Statistics, 810 Old Hardin Center, University of Nebraska-Lincoln, Lincoln, Nebraska 68583. laura.duclos@gmail.com
* Department of Statistics, Avery Hall, University of Nebraska-Lincoln, Lincoln, Nebraska 68583
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Brent B. Nickol
Brent B. Nickol
Department of Mathematics and Statistics, 810 Old Hardin Center, University of Nebraska-Lincoln, Lincoln, Nebraska 68583. laura.duclos@gmail.com
† School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska 68588
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J Parasitol (2006) 92 (4): 749–755.
Citation
Laura M. Duclos, Bradford J. Danner, Brent B. Nickol; VIRULENCE OF CORYNOSOMA CONSTRICTUM (ACANTHOCEPHALA: POLYMORPHIDAE) IN HYALELLA AZTECA (AMPHIPODA) THROUGHOUT PARASITE ONTOGENY. J Parasitol 1 August 2006; 92 (4): 749–755. doi: https://doi.org/10.1645/GE-770R.1
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