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The dynamics of nematode transmission in the red grouse (Lagopus lagopus scoticus) : studies on the recovery of Trichostrongylus tenuis larvae from vegetation

Published online by Cambridge University Press:  11 April 2024

L.M. Saunders ,
D.M. Tompkins  and
P.J. Hudson
L.M. Saunders*
Affiliation:
Institute of Biological Sciences, University of Stirling, Stirling, FK9 4LA, UK
P.J. Hudson
Affiliation:
Institute of Biological Sciences, University of Stirling, Stirling, FK9 4LA, UK
*
*Fax: (44) 1786 464994, Email [email protected]
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Abstract

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Attempts to recover the infective third-stage larvae of Trichostrongylus tenuis from heather (Calluna vulgaris) vegetation in the field are rarely successful because the larvae may be: (i) concealed within heather leaflets; (ii) concentrated in dew droplets which are lost from the plants upon sampling; or (iii) simply highly aggregated in the field. Heather plants were exposed to T. tenuis larvae in the laboratory and kept under suitable conditions for larval migration. Few larvae were found in dew droplets or concealed within heather leaflets; most larvae were recovered from the plant surface. This suggests that the low larval recovery from vegetation in the field simply reflects a highly aggregated distribution of few larvae. In a second experiment, the efficiency with which infective larvae migrate up the structurally complex heather plants was compared with migration up two control plant species with simpler structures: a monocotyledon, wheat, and a dicotyledon, hebe. After constant exposure, significantly more larvae were recovered from heather than from either of the control plants. This implies that the structural complexity of heather causes no problems for the infective larvae.

Type
Review Article
Information
Journal of Helminthology , Volume 73 , Issue 2 , February 1999 , pp. 171 - 175
Copyright
Copyright © Cambridge University Press 1999

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