Constraints on percussive seismic signals in a noisy environment by European fiddler crabs, Afruca tangeri.

For both energy models (LMM LEClaw , LMM LECar ), the interaction term was highly significant ( P <0.001; Table S2 ) and six individual post hoc models (LMMD EnergyClaw , LMMD EnergyCar , LMMBD EnergyClaw , LMMBD EnergyCar , LMMNP EnergyClaw , LMMNP EnergyCar ) further tested the effect of claw and carapace size on the energy of the three behavioural groups whilst controlling for repeated measures.

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Considered independently, this model indicates that effect of claw size on absolute spike amplitude was marginally non-significant ( P =0.08) but the direction of the effect remained positive.

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Further, the frequency content of signals is commonly affected by the percussed structure, which may be significant owing to resonance.

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