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Passive electroreception in aquatic mammals.

Nicole U Czech-Damal1, Guido Dehnhardt, Paul Manger

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Passive electroreception allows aquatic animals to detect prey via electric fields. This review compares electroreceptor organs in the platypus and Guiana dolphin, revealing shared function but different evolutionary origins.

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Area of Science:

  • Sensory Biology
  • Comparative Anatomy
  • Evolutionary Biology

Background:

  • Passive electroreception is a key sensory modality in aquatic vertebrates, primarily fishes, enabling detection of biogenic electric fields from prey.
  • Electroreception has evolved independently multiple times, highlighting its adaptive significance for predators.
  • Mammalian electroreception is rare, found in monotremes (platypus, echidnas) and the Guiana dolphin.

Purpose of the Study:

  • To review and compare the morphology, function, and origin of electroreceptors in two aquatic mammals: the platypus and the Guiana dolphin.
  • To identify similarities and differences in electroreceptor systems between these species and with fish.
  • To provide insights for identifying electroreceptors in other species.

Main Methods:

  • Comparative review of existing literature on platypus and Guiana dolphin electroreceptors.
  • Analysis of morphological similarities and differences in electroreceptor structures.
  • Examination of functional aspects, including sensory thresholds and prey detection strategies.
  • Investigation of the developmental origins of electroreceptor accessory structures.

Main Results:

  • Platypus and Guiana dolphin electroreceptors share morphological similarities with fish ampullary electroreceptors.
  • Both species utilize electroreception for prey detection in low-visibility conditions or substrate-based foraging.
  • Sensory thresholds for electroreception are comparable between the platypus and Guiana dolphin.
  • Electroreceptors in both species are innervated by the trigeminal nerve.
  • Electroreceptor origins differ: skin glands in platypus, vibrissal system in Guiana dolphins.

Conclusions:

  • Despite different evolutionary origins, platypus and Guiana dolphin electroreceptors exhibit convergent functional and morphological traits.
  • The comparative study of these mammals offers valuable models for understanding electroreception evolution and identifying these sensory organs across diverse taxa.
  • Trigeminal nerve innervation is a conserved feature of electroreceptors in these aquatic mammals.