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Inner Ear Otolith Asymmetry in Late-Larval Cichlid Fish (Oreochromis mossambicus, Perciformes) Showing Kinetotic Behaviour Under Diminished Gravity

Anken, Ralf and Knie, Miriam and Hilbig, Reinhard (2017) Inner Ear Otolith Asymmetry in Late-Larval Cichlid Fish (Oreochromis mossambicus, Perciformes) Showing Kinetotic Behaviour Under Diminished Gravity. Scientific Reports (7), pp. 1-7. Nature Publishing Group. DOI: 10.1038/s41598-017-15927-z ISSN 2045-2322

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Official URL: https://doi.org/10.1038/s41598-017-15927-z

Abstract

The inner ears of all vertebrates are designed to perceive auditory and vestibular inputs. Although a tremendous diversity in the inner ear can be found even among bony fishes, the morphologies of the utricle and of the semicircular canals are rather conservative among vertebrates. Fish show kinetoses under reduced gravity (spinning movements and looping responses) and are regarded model organisms concerning the performance of the otolithic organs. Otoliths can be analysed easily because they are compact, in contrast to the otoconial masses of other vertebrates. Here, late-larval Oreochromis mossambicus were subjected to 0.0001 × g and 0.04 × g aboard a sounding rocket, their behavior was observed and morphometrical analyses on otoliths were carried out. Fish swimming kinetotically at 0.0001 × g had a higher asymmetry of utricular otoliths (gravity perception) but not of saccular otoliths (hearing process) than specimens behaving normally at this gravity level (p = 0.0055). Also, asymmetries of lapilli in animals swimming normally at 0.0001 × g were lower than asymmetries in specimens swimming normally at 0.04 × g (p = 0.06). This supports the “otolith asymmetry hypothesis”, an explanation for the susceptibility to kinetosis, particularly concerning the utricular otoliths. It would be interesting to identify processes generating asymmetric otoliths, also in regard to human motion sickness.

Item URL in elib:https://elib.dlr.de/116197/
Document Type:Article
Title:Inner Ear Otolith Asymmetry in Late-Larval Cichlid Fish (Oreochromis mossambicus, Perciformes) Showing Kinetotic Behaviour Under Diminished Gravity
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Anken, Ralfgerman aerospace center (dlr), institute of aerospace medicine, gravitational biology, cologne, germanyhttps://orcid.org/0000-0001-7490-6823
Knie, MiriamUniversity of Bayreuth, Animal Ecology I, Bayreuth, GermanyUNSPECIFIED
Hilbig, Reinharduniversity of hohenheim, institute of zoology, stuttgart, germanyhttps://orcid.org/0000-0002-0664-8989
Date:15 November 2017
Journal or Publication Title:Scientific Reports
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1038/s41598-017-15927-z
Page Range:pp. 1-7
Publisher:Nature Publishing Group
ISSN:2045-2322
Status:Published
Keywords:Fish inner ear otoliths, Otoliths asymmetry, Vestibular inputs, Utricle, Semicircular canals, Human motion sicknes, Asymmetry, Kinetosis, Gravity perception
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Biowissenschaftliche Exp.-vorbereitung, R - Vorhaben Biowissenschaftliche Nutzerunterstützung
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Gravitational Biology
Deposited By: Duwe, Helmut
Deposited On:28 Nov 2017 11:22
Last Modified:08 Mar 2018 18:36

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