...Shannon D. Wiser; Michael R. Markham ABSTRACT Weakly electric gymnotiform fishes use self-generated electric organ discharges (EODs) to navigate and communicate. The electrosensory range for these processes is a function of EOD amplitude, determined by the fish's electric organ (EO) output...

...Angel Ariel Caputi ABSTRACT The electric organ discharges (EODs) produced by weakly electric fish have long been a source of scientific intrigue and inspiration. The study of these species has contributed to our understanding of the organization of fixed action patterns, as well as enriching...

...Virginia Comas; Kim Langevin; Ana Silva; Michel Borde ABSTRACT South American weakly electric fish (order Gymnotiformes) rely on a highly conserved and relatively fixed electromotor circuit to produce species-specific electric organ discharges (EODs) and a variety of meaningful adaptive EOD...

...) is a behavioral strategy thought to reduce electrosensory interference from conspecific signals close in frequency. We used playback experiments to characterize electric organ discharge frequency (EODf), chirping behavior and the JAR of Distocyclus conirostris , a gregarious electric fish species. EODs of D...

... to stimuli arising from different contexts, by measuring changes in the electric organ discharge (EOD) frequency. Specifically, we focused on envelopes, which can arise either because of movement (i.e. motion envelopes) or because of interactions between the electric fields of three of more fish (i.e. social...

... electric organ discharge Neurons transmit information with trains of action potentials, or spikes. The relationship between spikes and the information they represent is referred to as a neural code ( Perkel and Bullock, 1968 ). Information can be encoded in the spike trains of single neurons...

... that produce the electric organ discharge (EOD). Just over 50 years ago the first experimental analyses of electrocyte physiology demonstrated that the EOD is produced and shaped by the timing and waveform of electrocyte action potentials (APs). Electrocytes of some species generate a single AP from a distinct...

...Peter Machnik; Bernd Kramer SUMMARY In adult males of the South African weakly electric bulldog fish, Marcusenius pongolensis , the duration of the electric organ discharge(EOD) increases with body size over lifetime. Although there is experimental support for intrasexual selection (male–male...

... electric organ discharge Mormyridae Gnathonemus petersii The electric sense of mormyrid weakly electric fish is generally regarded as an adaptation to a life under conditions not favourable for visual orientation, i.e. a nocturnal life in dark and sometimes turbid waters. Although recent...

... of Biologists Limited 2008 2008 gymnotiform sexual dimorphism circadian rhythm electric fish electric organ discharge energetic cost communication signal Opposing selective forces shape the sexually dimorphic communication signals of many species. Mate choice and intrasexual competition...

...Ryan Y. Wong; Carl D. Hopkins SUMMARY Mormyrid electric fish rely on the waveform of their electric organ discharges (EODs) for communicating species, sex, and social status, while they use the sequences of pulse intervals (SPIs) for communicating rapidly changing behavioral states and motivation...

...-mail: [email protected] ) 3 6 2004 © The Company of Biologists Limited 2004 2004 electric organ discharge jamming avoidance response electric fish inter-pulse interval transient interval shortening South and central American electric fish use a specialized electric organ...

...Bruce A. Carlson; Carl D. Hopkins SUMMARY Like all mormyrid fish, Brienomyrus brachyistius produces an electric organ discharge (EOD) with a constant waveform and variable sequence of pulse intervals (SPI). Periodic bursts fall into two display categories termed `scallops' and `accelerations...

... changes in the electric organ discharge(EOD) of subadult Gnathonemus petersii under non-breeding environmental conditions. Increases in EOD duration and changes in the relative phase amplitudes occurred in dominant fish during same-sex(male–male, female–female) and opposite-sex interactions. Similar...

...Philip K. Stoddard; Michael R. Markham; Vielka L. Salazar SUMMARY The gymnotiform electric fish Brachyhypopomus pinnicaudatus communicates with a sexually dimorphic electric waveform, the electric organ discharge (EOD). Males display pronounced circadian rhythms in the amplitude and duration...

...Stefan Schuster SUMMARY Gymnotiform weakly electric fish find their way in the dark using a continuously operating active sensory system. An electric organ generates a continuous train of discharges (electric organ discharges, EODs), and tuberous high-frequency electroreceptors monitor the pattern...

...Stefan Schuster ABSTRACT Weakly electric fish of the pulse type electrolocate objects in the dark by emitting discrete electric organ discharges (EODs) separated by intervals of silence. Two neighbouring pulse-type fish often reduce the risk of discharging simultaneously by means of an ‘echo...

...Pedro A. Aguilera; María E. Castelló; Angel A. Caputi ABSTRACT Local electric fields generated by the electric organ discharge of Gymnotus carapo were explored at selected points on the skin of an emitter fish (‘local self-generated fields’) and on the skin of a conspecific (‘local conspecific...

... of intact Gymnotus carapo was experimentally interrupted to investigate how this pausing affects post-pause electric organ discharges. In particular, an analysis was conducted of how the amplitude and relative timing of the three major deflections of the complex discharge change over the course of the first...

... by the electroreceptors. We have therefore focused on reconstructing both the electric organ discharges (EODs) and the electric images resulting from nearby objects and the fish’s exploratory behaviors. Here, we review results from a combination of techniques, including field measurements, numerical and semi-analytical...