Morphological differentiation among native trout populations in North-Western Greece

Journal of Biological Research (Impact Factor: 0.65). 01/2012; 17:33-43.


Morphology of native brown trout (Salmo spp.) from four major rivers of Western Greece was
analyzed using 36 morphometric and 7 meristic characters in order to clarify its taxonomic status
and provide insights about the life models followed by these populations. Significant between-
population differences were observed in both types of characters. Discriminant analysis
allowed correct classification of 92.9% of all specimens. Differences in morphometric traits were
related to body shape as well as to fin positioning and length. Cluster analysis carried out separately
on mean morphometric and modal meristic values of populations indicated (in both cases)
distinct position of the trout population from Louros River. Morphometrics of S. lourosensis suggest
a spatially restricted resident model of life, in which case conservation measures should be
focused on restoration and protection of the uppermost part of the stream where the species is

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    • "Two species (Salmo lourosensis and Telestes pleurobipunctatus) exhibited a positive allometric growth (b > 3). Yet, the allometric growth of Salmo lourosensis has been already observed by Liasko et al. (2012) under the morphological analysis of the native trout populations of north-western Greece. Since described b values correspond to the observed length ranges, extrapolation of these parameters to different length ranges should be handled with caution (Petrakis and Stergiou 1995). "
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    ABSTRACT: Length–weight relations were estimated for 7 native fish species of the Louros River in north-western Greece, 6 of them being endemic to the Ionian Sea ecoregion. The b values ranged from 3.05 to 3.21. Five species, namely Cobitis hellenica Economidis et Nalbant, 1996; Pelasgus thesproticus (Stephanidis, 1939); Gasterosteus gymnurus Cuvier, 1829; Economidichthys pygmaeus (Holly, 1929); and Valencia letourneuxi (Sauvage, 1880) displayed an isometric growth pattern (b = 3) while the remaining two species—Salmo lourosensis Delling, 2011 and Telestes pleurobipunctatus (Stephanidis, 1939)—showed a positive allometric growth (b > 3). New maximum lengths are given for three species. Moreover, this study constitutes the first world report on the length–weight relations for 5 species and the first report for the Ionian Sea ecoregion for two other species.
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    ABSTRACT: The morphological variation of Penaeus monodon was studied based on the morphometric analyses of samples collected throughout Banda Aceh, Khanom, Mozambique and Sanya. A total of 470 samples were investigated using eight measurements. Multivariate analyses [principal components (PCA), discriminant function (DFA) and cluster analyses (CA)] revealed obvious morphometric differences among the four geographical populations. PCA indicated that the first three components of the females and the first two components of the males accounted for 75.17% and 71.84% of the total morphological variability respectively. In DFA, the overall assignment of female and male individuals into their original population was 78.95% and 84.37% respectively. For females, the proportion of individuals correctly classified into their original population was 76.0%, 92.8%, 92.6% and 54.5% for population 1, 2, 3 and 4 respectively. For males, the proportion was 97.2%, 68.1%, 100% and 72.2% respectively. For females and males, CA showed that the four populations could be divided into two main clusters of morphological characteristics. CA also indicated that the morphological variation of population 3 was greater, whereas the morphology of population 2 was strikingly similar to that of population 4.
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