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

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 place...

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Bibliographic Details
Published in:Parasitology 2002-12, Vol.125 (6), p.553-560
Main Authors: SCIACCA, J., KETSCHEK, A., FORBES, W. M., BOSTON, R., GUERRERO, J., ASHTON, F. T., GAMBLE, H. R., SCHAD, G. A.
Format: Article
Language:English
Subjects:
Ancylostoma - growth & development
Ancylostoma - physiology
Ancylostoma caninum
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Autoecology
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
geotaxis
Haemonchus - growth & development
Haemonchus - physiology
Haemonchus contortus
Larva - physiology
Larvae
Locomotion - physiology
Parasites
Protozoa. Invertebrata
Space life sciences
Strongyloides stercoralis
Strongyloides stercoralis - growth & development
Strongyloides stercoralis - physiology
thermotaxis
Tropism
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Summary: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.
ISSN:0031-1820
1469-8161
DOI:10.1017/S0031182002002391