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Vertical migration by the infective larvae of three species of parasitic nematodes: is the behaviour really a response to gravity?

Published online by Cambridge University Press:  11 February 2003

J. SCIACCA ,
A. KETSCHEK ,
W. M. FORBES ,
R. BOSTON ,
J. GUERRERO ,
F. T. ASHTON ,
H. R. GAMBLE  and
G. A. SCHAD
J. SCIACCA
Affiliation:
Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, 3800 Spruce Street, Philadelphia, PA 19104, USA
A. KETSCHEK
Affiliation:
Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, 3800 Spruce Street, Philadelphia, PA 19104, USA
W. M. FORBES
Affiliation:
Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, 3800 Spruce Street, Philadelphia, PA 19104, USA
R. BOSTON
Affiliation:
Clinical Studies, NBC, School of Veterinary Medicine, University of Pennsylvania, 382 West Street Road, Kennett Square, PA 19348, USA
J. GUERRERO
Affiliation:
Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, 3800 Spruce Street, Philadelphia, PA 19104, USA
F. T. ASHTON
Affiliation:
Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, 3800 Spruce Street, Philadelphia, PA 19104, USA
H. R. GAMBLE
Affiliation:
US Department of Agriculture, Agriculture Research Service, Parasite Biology, Epidemiology and Systematics Laboratory, Building 1040, Room 103, BARC-East, Beltsville, MD 20705, USA
G. A. SCHAD
Affiliation:
Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, 3800 Spruce Street, Philadelphia, PA 19104, USA
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Abstract

Vertical migration by infective larvae (L3) of 3 species of nematodes was investigated. Upright truncated agarose cones were used to test upward migration, and comparable truncated cone-shaped agarose hollows were used to test downward migration. Flat agarose plates were control surfaces. When placed at the bases of upright cones, 74% of Ancylostoma caninum L3 migrated up, whereas only 16·5% migrated down the indented cones; this latter value was not significantly different from larval migration on flat plates. Strongyloides stercoralis L3 also migrated upward in significant numbers (80%). These larvae also failed to migrate downward under normal conditions. However, when the bottoms of the indented cones were 3–5 °C warmer than the tops, 75·5% of S. stercoralis L3 migrated down. In contrast, Haemonchus contortus L3 showed no tendency to crawl up or down cones, when compared with normal crawling behaviour on flat plates. Thus, L3 of A. caninum and S. stercoralis exhibited negative geotaxis, crawling against the pull of gravity, while H. contortus did not. The biology of these parasites may explain these behavioural differences.

Keywords

Ancylostoma caninumgeotaxisHaemonchus contortusStrongyloides stercoralisthermotaxis
Type
Research Article
Information
Parasitology , Volume 125 , Issue 6 , June 2002 , pp. 553 - 560
Copyright
© 2002 Cambridge University Press

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