Sixty-five plant species have been found in Lake Provala (the Vojvodina Province, Serbia) and its riparian zone. Among them, three hydrophytes were dominant: Nymphoides peltata, Myriophyllum spicatum and Ceratophyllum demersum. As interactions between different ecological factors, especially light, temperature and nutrient level, are of prime importance for productivity of macrophytes, we analyzed the main physical and chemical indicators of water quality in the studied location. In the vegetation period of the year 2000, the dominant hydrophytes were analyzed for biomass production dynamics in the studied aquatic ecosystem, including fresh weight (FW), dry weight (DW) and ash free dry weight (AFDW). The studied plant species achieved maximum biomass production in June, with statistical differences among the species at the significance level of α = 0.05.
The relationship between twelve genotypes of eastern cottonwood (Populus deltoides Bartr.) was analyzed according to sixteen early rooting traits and cutting survival. Principal component analysis (PCA) and cluster analysis were used on data that were standardized by common and by one alternative way of standardization. Alternative way of standardization (standardization with within-genotype standard deviation instead of standard deviation of genotypes’ means) was used in order to emphasize the contribution of genotype to the effect of differences among genotypes on total variation. After bought ways the first principal component had high correlation with the most of rooting traits and cutting survival, while the second was mainly related to the traits of root formation on the basal cut of cutting (wound roots). Three difficult-to-root genotypes (S6-7, S1-3, 129/81) were distinctly grouped against other examined genotypes, by bought principal component and cluster analysis. There was a slight difference in grouping of easy-to-root genotypes (B-229 and PE19/66) among examined ways of standardization
The analysis of influence of social-economic factors is important in the analysis of demographic development of population in Vojvodina Province. The development of each society is significantly implied with interaction of demographic and social-economic factors. In the paper the relevant indicators of demographic development of population in Vojvodina are explored. The combined data from population census and yearly published data related to communes and districts of Vojvodina were used. The estimated empirical regression models based on chosen variables, ought to illustrate the reached level of demographic development in Vojvodina Province. The relations of the following variables are analyzed: the total number of inhabitants, the number of active persons, the number of agriculturists per 100 population, the rate of employment, national income, rates of natural increase, birth and mortality etc. The authors expect that the obtained results will contribute to explain the questions concerned with the development of Vojvodina. Province
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