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Alightweight, collapsible funnel trap designed for crayfish was furnished with asmaller mesh and then used to study adult breeding populations of five speciesof newts in five ponds in France. Observations were made in spring, at the peakof breeding activity, over an 11-year period. Annual experiments involved onaverage 7.7 traps and 5.3 overnight sampling sessions at 2.0 day intervals. In95 out of 171 experiments (56%) the probability for an individual to go undetectedwas <1%. A trend was observed for catchability to increase with body size (Lissotriton < Ichthyosaura < Triturus).The two Triturus species werefrequently exhaustively sampled in a single overnight session. In spite oftheir smaller size, L. helveticusmales were more readily captured than females, presumably reflecting breedingassociated locomotor activity. The numbers captured decreased over timesuggesting ‘trap shyness’ to operate. We noted some predation by diving beetles(family Dytiscidae) affecting L.helveticus males in particular.

Sampling efficiency, bias and shyness in funnel trapping aquatic newts