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Electric organ discharges and electric images during electrolocation.
This work reconstructs both the electric organ discharges (EODs) and the electric images resulting from nearby objects and the fish's exploratory behaviors from a combination of techniques, including field measurements, numerical and semi-analytical simulations, and video imaging of behaviors. Expand
Electric signals: Predation, sex, and environmental constraints
Animals that depend on electric signals for navigation and communication have to balance physical constraints on electrostatic conduction and detection, physiological constraints on sensation and signal production, and selective pressures of predation and communication with respect to these conflicting environmental demands. Expand
Predation enhances complexity in the evolution of electric fish signals
It is shown here that predation pressure on neotropical, weakly electric fish seems to have selected for greater signal complexity, by favouring characters that have enabled further signal elaboration by sexual selection. Expand
Repertoire size, territory acquisition and reproductive success in the song sparrow
Half-hour repertoire size, which may represent an ecologically more relevant measure of repertoire size perceived by a transient listener, was also positively related to territory tenure and annual reproductive success, suggesting listeners might be able to assess a singing male's competitive ability without sampling the entire repertoire. Expand
Song-type matching in the song sparrow
The importance of the neighbour–stranger contrast, in addition to song similarity, in eliciting song matching confirms similar conclusions from earlier studies on the great tit and western meadowlark. Expand
Repertoire matching between neighbouring song sparrows
A male song sparrow,Melospiza melodia, has a song repertoire of about eight or nine distinct song types, and he typically shares several of these song types with each of his several neighbours. InExpand
Plasticity of the electric organ discharge waveform of the electric fish Brachyhypopomus pinnicaudatus I. Quantification of day-night changes
Turning the lights off at mid-day triggered an immediate increase in electric organ discharge, suggesting modification of existing ion channels in the electric organ, rather than altered genomic expression, which may reduce predation risk or energy expenditure. Expand
Songbird species differ in how their songs vary geographically, and the vocal behavior of Black-capped Chickadees exhibits an especially intriguing pattern of variation, and isolated groups of males may express divergent songs and singing behavior. Expand
Correlation of song learning and territory establishment strategies in the song sparrow.
It is argued that the young bird's song repertoire represents the "logical intersection" of the song repertoires of his tutor neighbors and is optimally designed for mimicry and for communication between neighbors. Expand
Fitness Correlates of Song Repertoire Size in Free‐Living Song Sparrows (Melospiza melodia)
Song sparrows inhabiting Mandarte Island, British Columbia, Canada, used 20 years of data to test whether a male’s song repertoire size, a secondary sexual trait, predicted overall measures of male or offspring fitness, and suggest that female song sp Sparrows would gain immediate and intergenerational fitness benefits by pairing with males with large song repertoires. Expand