Morphological differentiation among native trout populations in North-Western Greece

Journal of Biological Research (Impact Factor: 0.71). 01/2012; 17:33-43.

ABSTRACT 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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    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.
    Acta Ichthyologica Et Piscatoria 06/2014; 44(2):163-165. · 0.61 Impact Factor


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