Spooky Interaction at a Distance in Cave and Surface Dwelling Electric Fishes

Frontiers in Integrative Neuroscience
Eric S FortuneDaphne Soares

Abstract

Glass knifefish (Eigenmannia) are a group of weakly electric fishes found throughout the Amazon basin. Their electric organ discharges (EODs) are energetically costly adaptations used in social communication and for localizing conspecifics and other objects including prey at night and in turbid water. Interestingly, a troglobitic population of blind cavefish Eigenmannia vicentespelea survives in complete darkness in a cave system in central Brazil. We examined the effects of troglobitic conditions, which includes a complete loss of visual cues and potentially reduced food sources, by comparing the behavior and movement of freely behaving cavefish to a nearby epigean (surface) population (Eigenmannia trilineata). We found that the strengths of electric discharges in cavefish were greater than in surface fish, which may result from increased reliance on electrosensory perception, larger size, and sufficient food resources. Surface fish were recorded while feeding at night and did not show evidence of territoriality, whereas cavefish appeared to maintain territories. Surprisingly, we routinely found both surface and cavefish with sustained differences in EOD frequencies that were below 10 Hz despite being within close proximity of...Continue Reading

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Citations

Jul 28, 2021·Current Biology : CB·Federico Pedraja, Nathaniel B Sawtell
Nov 10, 2021·The Journal of Experimental Biology·Te K JonesCynthia F Moss

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Methods Mentioned

BETA
X-ray

Software Mentioned

GE Phoenix
custom
Matlab
Matlab randperm

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