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Effect of inbreeding and salinity on quantitative characters and asymmetry of Tisbe holothuriae (Humes)
Fava, G.; Martin, E. (1988). Effect of inbreeding and salinity on quantitative characters and asymmetry of Tisbe holothuriae (Humes), in: Boxshall, G.A. et al. (Ed.) Biology of copepods: Proceedings of the Third International Conference on Copepoda. Developments in Hydrobiology, 47: pp. 463-467. hdl.handle.net/10.1007/978-94-009-3103-9_52
In: Boxshall, G.A.; Schminke, H.K. (Ed.) (1988). Biology of copepods: Proceedings of the Third International Conference on Copepoda. Developments in Hydrobiology, 47. Kluwer Academic Publishers: Dordrecht. ISBN 90-6193-654-3. XII, 639 pp., more
In: Dumont, H.J. (Ed.) Developments in Hydrobiology. Kluwer Academic/Springer: The Hague; London; Boston; Dordrecht. ISSN 0167-8418, more

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Keywords
    Asymmetry; Inbreeding; Salinity; Copepoda [WoRMS]; Tisbe holothuriae Humes, 1957 [WoRMS]; Marine; Brackish water
Author keywords
    Copepods; Quantitative characters

Authors  Top 
  • Fava, G.
  • Martin, E.

Abstract
    Effects of differing salinities on morphological characters have been found in marine and brackish populations of Tisbe holothuriae. The results suggested an active role of salinity as a factor promoting divergence. In order to test if the observed differentiation could be due to the level of heterozygosity, a study was performed in strains with low and high homozygosity. Six quantitative traits, and their respective fluctuating asymmetry, have been measured in outbred (coefficient of consanguineity, F = 0) and inbred (F = 0.5) strains, raised at three salinities; 20, 25 and 35‰. The analysis of variance was applied to test if the morphological measures were the same, and if the variations induced by decreased salinity had the same trend, in the two strains. Wilcoxon test was applied to the asymmetry, when it was not possible to render the variances homogeneous. The results showed that the measures and the effects of salinity on morphometry differed in the strains with low and high homozygosity. No effect of salinity on asymmetry was found. Length measures showed higher asymmetry in the most homozygous strain.

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