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BIOMETRIC STUDY OF CRAYFISH POPULATIONS IN THE ANINA MOUNTAINS In our studies, for the comparison of these populations, we have used ratio among these parameters. Therefore, for both species we have measured the proportion between propodus and dactylus length, propodus length and chela width, dactylus length and chela width and also total length and cephalothorax length (table 5). Table 5. Rapports that show a discriminative character for the crayfish specimens measured in the Anina Mts. Austropotamobius torrentium Astacus astacus Ratio between Abbreviation Ratio between Abbreviation parameters: parameters: - - TL and CTL TL/CTL PL and DL PL/DL PL and DL PL/DL PL and CW PL/CW PL and CW PL/CW DL and CW DL/CW DL and CW DL/CW For our comparison between different populations we have used the ANOVA test, in order to underline the differences between specimens of the same sex, from different hydrographic basins. The individuals of A. torrentium species, that inhabit mainly the Nera basin, have also been found well represented in high number of individuals in two streams of the Caraş basin and in five streams of the Bârzava basin. According to the analysis of the diagrams from Figures 2 A, B and C the female populations of crayfish within the three investigated basins are not significantly different. However, we may notice a greater resemblance between the populations of the Nera and of the Bârzava basins. For A. torrentium species the males have been captured in a rather small number of specimens in the Bârzava basin; that is why, for the data analysis only the specimens captured in the Nera and Caraş basins have been taken into account. They display statistically significant differences in the case of the ratio PL/CW (p=0.01971) (Fig. 3). The A. astacus species was found in the Anina Mountains only in the Caras and Bârzava basins; in the upper part of the Bârzava River the species was discovered especially in reservoirs. After analyzing the distinct diagrams for the two sexes, we can state that the female populations from the two investigated basins are significantly different concerning the ratio between propodus length and chela width, as well as between dactylus length and chela width (Figs 4 A and B). 9
L. PÂRVULESCU 1,80 F(2, 55)=0.42758, p=0.65424 Vertical bars denote 0.95 confidence intervals 1,78 A. torrentium (PL/DL ratio) 1,76 1,74 1,72 1,70 1,68 A 1,66 Austor-Nera Austor-Bârzava Austor-Cara hidrographic basin 1,44 F(2, 55)=0.56337, p=0.57253 Vertical bars denote 0.95 confidence intervals 1,42 1,40 A. torrentium (DL/CW ratio) 1,38 1,36 1,34 1,32 1,30 1,28 1,26 1,24 B 1,22 Austor-Nera Austor-Bârzava Austor-Cara hidrographic basin Fig. 2. ANOVA tests for the female specimens of A. torrentium from Nera, Bârzava and Caraş hydrographic basins: A –for the ratio PL/DL; B –for the ratio DL/CW; 10
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