Predation enhances complexity in the evolution of electric fish signals

@article{Stoddard1999PredationEC,
  title={Predation enhances complexity in the evolution of electric fish signals},
  author={Philip K. Stoddard},
  journal={Nature},
  year={1999},
  volume={400},
  pages={254-256}
}
  • P. Stoddard
  • Published 15 July 1999
  • Biology, Medicine
  • Nature
Theories of sexual selection assume that predation is a restrictive, simplifying force in the evolution of animal display characters and many empirical studies have shown that predation opposes excessive elaboration of sexually selected traits. In an unexpected turnaround, I show here that predation pressure on neotropical, weakly electric fish (order Gymnotiformes) seems to have selected for greater signal complexity, by favouring characters that have enabled further signal elaboration by… 
The evolutionary origins of electric signal complexity
  • P. Stoddard
  • Biology, Medicine
    Journal of Physiology-Paris
  • 2002
This study explores the evolutionary origins of waveform complexity in electric organ discharges (EODs) of weakly electric fish. I attempt to answer the basic question of what selective forces led to
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  • R. Krahe
  • Biology
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  • 2019
TLDR
The electric signals of weakly electric fishes have seen impressive diversification since the independent origin of electric organs in the ancestors of Gymnotiformes and Mormyroidea approximately 100 million years ago, and it seems likely that signal diversification has been driven more strongly by biotic factors.
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Electric signals follow the classic responses to opposing forces of natural and sexual selection, as exemplified in the visual signals of guppies and the acoustic signals of Tungara frogs.
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It is suggested that signal complexity has evolved in order to improve opponent assessment under conditions of high male–male competition and that intrasexual selection may play an important and previously underestimated role in the evolution of communicative systems.
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TLDR
The results suggest that B. bennetti represents a transitional phenotypic state within a clade where signal complexity and plasticity were initially gained and then lost, and is potential factors maintaining the monophasic EOD phenotype in the face of detection by electroreceptive predators.
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Natural selection arising from resource competition and environmental heterogeneity can drive adaptive radiation. Ecological opportunity facilitates this process, resulting in rapid divergence of
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It is found that male brown anoles dramatically decreased the amplitude of their head-bob displays in the presence of a predatory lizard, resulting in less conspicuous signals, which may be safer for the signaling individuals but also reduce the distance from which potential mates or competitors can detect them.
Sexual Selection and the Evolution of Vocal Mating Signals: Lessons from Neotropical Songbirds
TLDR
It is concluded that sexual selection on songs of neotropical birds acts in a manner consistent with present theory, although its study is greatly extending the boundaries of what the authors know about song in fascinating directions.
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A theory has been proposed which suggests that these fish, by means of their electric pulses, can locate objects if their electrical conductivity differs from that of water, and show striking features of convergent evolution.
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