![]() Competition for a communication channel has, however, only rarely been considered in this context, although it should be evident that as the number of species using the same channel in an ecosystem increases, the chances of successful communication will decrease. Ecologists soon recognized that competition for resources between species is an important factor affecting the abundance and distribution of species ( Connell, 1983). Gause on different species of Paramecium ( Gause, 1934). The role of competition for limited resources in natural selection has been recognized since the classical work of the Russian ecologist G. We discuss the consequences of these adaptations for intraspecific acoustic communication and reproductive isolation between species. Finally, the rainforest cricket also showed an almost perfect match between the filter for sensitivity and the peripheral filter for directional hearing, in contrast to its European counterparts. The neuronal representation of the calling song pattern within receivers was maintained for a wide range of signal-to-noise ratios because of the more sharply tuned sensory system and selective attention mechanisms. Again, the filter of the rainforest cricket performed significantly better in terms of representing this important signal parameter. We also quantified the performance of the sensory filter under the different filter regimes by examining the representation of the species-specific amplitude modulation of the male calling song, when embedded in background noise. The filter reduced background nocturnal noise levels by 26 dB, compared with only 16 and 10 dB in the two European species. As predicted, the rainforest species exhibited a more selective tuning compared with the European counterparts. Here we studied the frequency tuning of an auditory neuron mediating phonotaxis in the rainforest cricket Paroecanthus podagrosus, suffering from strong competition, in comparison with the same homologous neuron in two species of European field crickets, where such competition does not exist. ![]() ![]() ![]() Because of call frequency overlap and masking interference, the airborne sound channel represents a limited resource for communication in a species-rich cricket community like the tropical rainforest.
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