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The energetic consequences of parasitism: effects of a developing infection of Trichostrongylus tenuis (Nematoda) on red grouse (Lagopus lagopus scoticus) energy balance, body weight and condition

Published online by Cambridge University Press:  06 April 2009

R. J. Delahay ,
J. R. Speakman  and
R. Moss
R. J. Delahay
Affiliation:
Zoology Department, University of Aberdeen, Aberdeen AB9 2TN, Scotland Institute of Terrestrial Ecology, Hill of Brathens, Banchory, Kincardineshire AB31 4BY, Scotland
J. R. Speakman
Affiliation:
Zoology Department, University of Aberdeen, Aberdeen AB9 2TN, Scotland
R. Moss
Affiliation:
Institute of Terrestrial Ecology, Hill of Brathens, Banchory, Kincardineshire AB31 4BY, Scotland
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Summary

The timing of the energetic consequences of a developing, single-dose infection of Trichostrongylus tenuis larvae was investigated in captive red grouse Lagopus lagopus scoticus. At 12 days post-infection (p.i.), infected birds had a resting metabolic rate 16% greater than controls and thenceforth lost weight at a faster rate than controls. At 16 days p.i. infected birds consumed 38% less energy and excreted 33% less energy than controls. The estimated total daily energy expenditure and energy expended on activity for infected birds at 16 days p.i. were 36% and 83% lower, respectively, than for controls. Infected birds lost condition from 16 days p.i. onwards. The period of energy imbalance at 12–16 days p.i. coincided with development of late 4th-stage larvae into adult worms and the onset of patency. After this, the effects on energy balance diminished. Synchronous development of previously arrested T. tenuis larvae in wild birds in spring probably has similar effects to those reported here and places grouse under conditions of energy imbalance. The observed effects on energy balance provide a possible mechanism by which the parasite can reduce fecundity and survival of infected grouse.

Keywords

Trichostrongylus tenuisred grouseenergy balancepathophysiologyarrested larvae
Type
Research Article
Information
Parasitology , Volume 110 , Issue 4 , May 1995 , pp. 473 - 482
Copyright
Copyright © Cambridge University Press 1995

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