First International Conference on MOLDAVIAN RISKS – FROM ...

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ong>Firstong> ong>Internationalong> ong>Conferenceong> on MOLDAVIAN RISKS - FROM GLOBAL TO LOCAL SCALE 16-19 May 2012, Bacau, Romania ASSESSING TEMPORAL AND SPATIAL VARIATIONS IN SIZE OF DIFFERENT FISH POPULATIONS RELATED WITH DIFFERENT BIOTIC ENVIRONMENTAL ATTRIBUTES Camelia Ureche 1 , Dorel Ureche 2 , Iuliana Lazar 3 1 “Vasile Alecsandri” University of Bacau, Department of Biology, Ecology and Environmental Protection 2 “Vasile Alecsandri”University of Bacau, Department of Environmental Engineering and Mechanical Engineering 3 “Vasile Alecsandri”University of Bacau, Department of Chemical and Food Engineering Corresponding author: Iuliana Lazar, ilazar@ub.ro Abstract: A total of 2789 fish specimens from the basin of River Casin were caught in September 1999, in August and September 2004 and in September 2008 by electrofishing in order to investigate inter-relationships between growth and condition expressed by physical environment parameters. A Factor Analysis extracting the Principal Components (PCA) and Cluster Analysis, was also applied in order to identify variables that maximizes the dispersion or correlation criteria assigned to investigated samples and their association in order to compare with other studies. At the first factor PC1 the dimension of total length Lt (cm) and standard length l (cm) have the highest percentage (0.975) followed by head length Lc (cm) (0.953) and height H (cm) (0.934), at the second factor PC2 the largest share is attributed to air temperature (0.946) followed by the water temperature (0.912) and at the third factor PC3 water conductivity has the largest share of (-0.914) followed by water pH (0.863). A complex analysis using One Way ANOVA was performed to compare the frequency distributions of the lengths and weights of different fish populations related with different biotic environmental attributes and their evolution in time and in space. At Sabanejewia balcanica, Barbatula barbatula and Gobio obtusirostris species, there were statistically significant differences especially in 2008 along the investigated areas. This indicates that physical factors of the environment, especially air and water temperature, can influence with propensity these species. Key words: environment, fish, PCA, cluster, ANOVA. 88

ong>Firstong> ong>Internationalong> ong>Conferenceong> on MOLDAVIAN RISKS - FROM GLOBAL TO LOCAL SCALE 16-19 May 2012, Bacau, Romania RISK EXPOSURE TO ENVIRONMENTAL STRESS OF SEVERAL FISH SPECIES REFLECTS ON ALLOMETRIC SCALING DECREASES Dorel Ureche 1 , Camelia Ureche 2 , Iuliana Lazar 3 1 “Vasile Alecsandri” University of Bacau, Department of Mechanical and Environmental Engineering 2 “Vasile Alecsandri” University of Bacau, Department of Biology, Ecology and Environmental Protection 3 “Vasile Alecsandri” University of Bacau, Department of Chemical and Food Engineering Corresponding author: Iuliana Lazar, ilazar@ub.ro Abstract: In view of a sustainable development it is necessary to identify species of fish with an increased risk of being affected by environmental quality. For this, specimens of Salmo trutta fario, Squalius cephalus, Phoxinus phoxinus, Alburnoides bipunctatus, Gobio obtusirostris, Barbus Barbus, Barbus petenyi, Barbatula barbatula, Sabanejewia balcanica, and Cottus gobio were collected at 8 previously determined points from the Casin River basin in August and September 2004, and September 2008, and grouped into two areas: upstream Casin region considered an unpolluted area and downstream Casin region considered a high pollution area. The purpose of this study is to determine the allometric exponent for identified species of fish, specific to the habitat, and the estimation of correlations between this parameter and the degree of pollution, in order to identify species with a high risk to environmental stress. Analyzing allometric scaling values (α) with specific analytical methods for captured fish populations in these areas we concluded that the characteristic values of this parameter for some species is strongly affected in time by the presence of pollutants factors. For some species, the allometric parameter decreased between 2004 and 2008, but in the polluted zone, the decrease was higher than in the unpolluted zone. For example, for Squalius cephalus the parameter’s value was 3.0319/3.342 (unpolluted/polluted zone) in 2004 and 2.9888/2.7934 in 2008 and for Barbus petenyi α was 3.2050/3.2468 in 2004 and 2.7486/2.6217 in 2008. For some species the changes in the development process were significant, the important decrease of allometric scaling value indicating that these species were affected by the environmental stress. In this category must be presented the case of Sabanejewia balcanica, with remarkable changes: from 3.9547 in 2008 in unpolluted area α value drops to 0.9066 in the polluted area in the same year. Significant interaction between environmental conditions and a certain type of species was confirmed by Three-Way ANOVA test (F=3.893, df = 4, p = 0.019). Key words: allometry, fish, regression, pollution. 89

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