Dolomedes triton

Dolomedes triton S,E Male dragline following behavior change after contact with water that housed females or their draglines Roland and Rovner, 1983... 

Dolomedes triton males live mainly on water surfaces and can follow female draglines, even on water. Males also respond to water that has been in contact with female integument with announcement displays, which are enhanced in the presence of silk (Roland and Rovner, 1983). Earlier experiments had suggested the presence of an ether-soluble pheromone on the integument of the congener Dolomedes scriptus that released courtship in males, as did the silk of females (Kaston, 1936). 

Roland, C. and Rovner, J. S. (1983). Chemical and vibratory communication in the aquatic pisaurid spider Dolomedes triton. Journal of Arachnology 11 77-85. 

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