Studies on the aggregation behaviour ofNippostrongylus brasiliensis

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Abstract
Two behaviour patterns which could bring about clumping inN. brasiliensis, sexual attraction and thigmokinesis, were investigated. A T-tube choice-chamber to facilitate anin vitrostudy of sexual attraction is described. A method for studying aggregation is also outlined. MaleN. brasiliensiswere shown to be attracted to female worms, positive sexual attraction. Both sexes were shown to exhibit strong thigmokinetic responses, and possible functions of such behaviour are discussed.I am grateful to Professors J. Brough and D. Bellamy for providing the facilities during the course of this study. I should also like to thank Dr E.. A. Hammond for his supervision, help and criticism throughout the project. This work was carried out during the tenure of a Scientific Research Council Studentship.