Ontogenetic causes and mechanisms for formation of differences in number of fish scales

Ontogenetic causes and mechanisms for formation of differences in number of fish scales Fish squamation is developed in late ontogeny. Therefore, the conditions of development significantly affect its characteristics (number of scales). This study is aimed at considering the influence of external and internal factors on variation of the number of scales in fish. Acceleration of development results in decrease of the number of scales, while it increases with retardation. Experiments on regulation of thyroid status of fish showed that the certain mechanism of alteration of the number of scales is related with heterochrony, such as a shift of the timing of squamation. Accelerated development is caused by early scale development at smaller body length, while retarded development is characterized with later scale development and at greater body length. Data considering heterochrony as the possible reason for differences in the number of scales in related fish species are represented. Moreover, alterations of the distance between scales (morphogenetic count) can serve as another alteration mechanism of the number of scales in fish (especially phyletically distant species). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Developmental Biology Springer Journals

Ontogenetic causes and mechanisms for formation of differences in number of fish scales

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Publisher
SP MAIK Nauka/Interperiodica
Copyright
Copyright © 2011 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Developmental Biology; Animal Anatomy / Morphology / Histology
ISSN
1062-3604
eISSN
1608-3326
D.O.I.
10.1134/S1062360411030106
Publisher site
See Article on Publisher Site

Abstract

Fish squamation is developed in late ontogeny. Therefore, the conditions of development significantly affect its characteristics (number of scales). This study is aimed at considering the influence of external and internal factors on variation of the number of scales in fish. Acceleration of development results in decrease of the number of scales, while it increases with retardation. Experiments on regulation of thyroid status of fish showed that the certain mechanism of alteration of the number of scales is related with heterochrony, such as a shift of the timing of squamation. Accelerated development is caused by early scale development at smaller body length, while retarded development is characterized with later scale development and at greater body length. Data considering heterochrony as the possible reason for differences in the number of scales in related fish species are represented. Moreover, alterations of the distance between scales (morphogenetic count) can serve as another alteration mechanism of the number of scales in fish (especially phyletically distant species).

Journal

Russian Journal of Developmental BiologySpringer Journals

Published: Jun 8, 2011

References

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