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Evolution: Sea robins get a leg up.

Harold H Zakon1

  • 1Department of Neuroscience, University of Texas, Austin, TX 78712, USA; Department of Integrative Biology, University of Texas, Austin, TX 78712, USA; Marine Biological Laboratory, Woods Hole, MA 02543, USA.

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Sea robins use taste receptors on their leg-like fins to find prey on the ocean floor. This research explores the evolution of these unique sensory structures and behaviors, offering insights into novel phenotype development.

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Area of Science:

  • Marine Biology
  • Evolutionary Biology
  • Sensory Ecology

Background:

  • Sea robins possess unique pectoral fin modifications resembling legs, enabling benthic locomotion.
  • These fish exhibit specialized sensory adaptations for foraging in marine environments.

Purpose of the Study:

  • To investigate the role of taste receptors located on the pectoral fins of sea robins.
  • To understand how these chemosensory structures guide prey detection and capture behaviors.
  • To explore the evolutionary origins of novel phenotypes in aquatic vertebrates.

Main Methods:

  • Behavioral observations of sea robins foraging on the ocean bottom.
  • Anatomical examination of pectoral fin structures, focusing on taste bud distribution.
  • Experimental manipulation to assess the function of fin-based taste receptors in prey location.

Main Results:

  • Taste receptors are densely distributed on the ventral surface of sea robin pectoral fins.
  • These receptors are activated by chemical cues released by benthic prey.
  • Sea robins use fin-based taste information to direct digging and successfully capture hidden prey.

Conclusions:

  • The pectoral fins of sea robins function not only for locomotion but also as sophisticated sensory organs for foraging.
  • The evolution of taste receptors on fins represents a significant adaptation for benthic predation.
  • This study provides a model for understanding the developmental and evolutionary pathways leading to novel phenotypes.