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Delayed transmission of a parasite is compensated by accelerated growth

Published online by Cambridge University Press:  28 June 2005

T. HAKALAHTI ,
M. BANDILLA  and
E. T. VALTONEN
T. HAKALAHTI
Affiliation:
Department of Biological and Environmental Science, P.O. Box 35 (ya), FIN-40014 University of Jyväskylä, Finland
M. BANDILLA
Affiliation:
Department of Biological and Environmental Science, P.O. Box 35 (ya), FIN-40014 University of Jyväskylä, Finland
E. T. VALTONEN
Affiliation:
Department of Biological and Environmental Science, P.O. Box 35 (ya), FIN-40014 University of Jyväskylä, Finland
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Abstract

Compensatory or ‘catch-up’ growth following prolonged periods of food shortages is known to exist in many free-living animals. It is generally assumed that growth rates under normal circumstances are below maximum because elevated rates of growth are costly. The present paper gives experimental evidence that such compensatory growth mechanisms also exist in parasitic species. We explored the effect of periodic host unavailability on survival, infectivity and growth of the fish ectoparasite Argulus coregoni. Survival and infectivity of A. coregoni metanauplii deprived of a host for selected time periods were age dependent, which indicates that all metanauplii carry similar energy resources for host seeking. Following the periods off-host, metanauplii were allowed to settle on rainbow trout and were length measured until they reached gravidity. During early development on fish, body length of attached A. coregoni was negatively correlated with off-host period indicating a mechanism that creates size variance in an attached parasite cohort originally containing equal amounts of resources. However, over time the size differences between parasites became less pronounced and eventually parasites that were kept off-host for longest periods of time reached the length of those individuals that had been allowed to infect a host sooner. A. coregoni thus appears to compensate for delayed growth resulting from an extended host searching period by elevated growth rates, although we show that such accelerated growth incurred a cost, through decreased life-expectancy.

Keywords

Argulus coregoniectoparasiteage-dependent survivaltransmissioninfectivitycompensatory growth
Type
Research Article
Information
Parasitology , Volume 131 , Issue 5 , November 2005 , pp. 647 - 656
Copyright
© 2005 Cambridge University Press

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