Mechanosensation in an adipose fin
Abstract
Adipose fins are found on approximately 20% of ray-finned fish species. The apparently rudimentary anatomy of adipose fins inspired a longstanding hypothesis that these fins are vestigial and lack function. However, adipose fins have evolved repeatedly within Teleostei, suggesting adaptive function. Recently, adipose fins were proposed to function as mechanosensors, detecting fluid flow anterior to the caudal fin. Here we test the hypothesis that adipose fins are mechanosensitive in the catfishCorydoras aeneus. Neural activity, recorded from nerves that innervate the fin, was shown to encode information on both movement and position of the fin membrane, including the magnitude of fin membrane displacement. Thus, the adipose fin ofC. aeneusis mechanosensitive and has the capacity to function as a ‘precaudal flow sensor’. These data force re-evaluation of adipose fin clipping, a common strategy for tagging fishes, and inform hypotheses of how function evolves in novel vertebrate appendages.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 16, 2016
- Source ID
- 10.1098/rspb.2015.2794
Entities
People
- Brett R Aiello
- Melina Elisabeth Hale
- Thomas A Stewart
Organizations
- Division of Graduate Education
- Division of Integrative Organismal Systems
- Office of Naval Research