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Ultrastructural correlates of acoustic sensitivity in Baikal coregonid fishes

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We investigated the ultrastructure of the sensory saccular and lagenar epithelia of the coregonid fishes: pelagic planktophage Baikal omul (Coregonus migratorius), benthophage lacustrine-riverine whitefish, or Baikal pidschian (C. pidschian), a typical inhabitant of the shallow water of the lake, and their hybrids of the first generation (F1). We made a few suggestions on the possible adaptive significance of ultrastructural specializations to acoustic sensitivity in different species of coregonid fishes. Unlike the shallow-water pidschian, both the pelagic omul and F1 hybrids possess higher morphological diversity of sensory cells. However, sensory cells of pidschian are characterised by sensory bundles with shorter stereocilia that presumably could perceive higher frequency sound oscillations. The saccular orientations are different from the earlier described ones in other whitefishes. The predominance of any direction in the morphological polarization of the sensory macula of different fish species is expected to be attributed to their ecology.
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Keywords: COREGONID FISHES; LAGENA; LAKE BAIKAL; MORPHOLOGICAL POLARIZATION; SACCULUS; SENSORY SYSTEM IN FISH; TYPES OF SENSORY CELLS; ULTRASTRUCTURE

Document Type: Research Article

Publication date: 2017-02-01

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  • Fundamental and Applied Limnology is an international journal for freshwater research in the widest sense, including problems of marine biology and brackish water research. Papers dealing with ecological topics are especially welcome in association with experimental or physiological studies. All papers published in this journal are subject to peer review.

    Archiv für Hydrobiologie, now Fundamental and Applied Limnology has been published continuously since 1906.

    Volumes prior to vol. 168 were published under the previous title Archiv für Hydrobiologie.
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