Monitoring and protecting flowing watercourses is a complex and challenging task that requires the collaboration and coordination of various stakeholders such as governments, industries, farmers, consumers and environmental groups. The study of the dynamics of the concentration of polluting factors and especially the concentrations of heavy metals and highlighting a seasonal variation is a necessary element from this point of view. In this article, we present the results of our analyses carried out in two measurement campaigns executed in 10 monitoring points along the Danube River, between Braila city and Isaccea city in the pre-deltaic area, during the summer season and autumn season 2022. The importance of this area is given by the fact that the Danube Delta is part of the UNESCO heritage, and the monitoring of polluting factors is a necessity in the desire to protect this area. The data measured during the July and August 2022 campaign cover a wide range of chemical species: Phosphate, CCO, CBO₅, NH₄⁺, N-NO₂, N-NO₃⁻, N-Total, P-PO₄ ³⁻, SO₄²⁻, Cl⁻, phenols, as well as metals with a harmful effect: Al, As, Cd, Cr, Fe. The study includes an evaluation based on the statistical approach of the results to highlight the significant correlations and differences identified between the two data sets. Next, to highlight the obtained results, a numerical model was considered using HEC-RAS and ESRI ArcGIS applications in a two-dimensional unsteady flow model in order to obtain the non-homogenous concentrations’ distributions in the studied area. These two-dimensional models have been less studied in the specialized literature. In this way, interesting results could be obtained, and prediction methods regarding the dynamics of metal concentrations could be structured. The data obtained were used for the terrain model from the USGS service, and the flows of the Danube and its two tributaries were simulated using the data provided by the national services. In this work, we present the results obtained for the dynamics of the concentrations of the metals Al, As, Cd, Cr and Fe and the evaluation of the specific absorption coefficients for the explanation and correlation with the results of the measurements. Except for the numerical model presented, we would like to highlight the existence of some contributions of the main tributaries of the Danube in the study area. Such a systematic study has not been carried out due to conditions imposed by the border authorities. From this point of view, this study has an element of originality. The study is part of a more complex project in which the spatio-temporal distribution of the polluting factors in the water was evaluated, and the habitats in the study area were inventoried—especially those of community interest. In this way, we were able to expose the self-purification capacity of the Danube and highlight the existence of a concentration reduction gradient along the course of the river. The aspects related to the influence of the distribution of polluting factors on the state of health will be the subject of another article.

Faunistic data on some true bugs species (Insecta: Heteroptera) from West Turkey [Results of the "Taurus" - 2005 and "Focida" - 2006 expeditions]: The paper presents a list of Heteroptera species (except Miroidea) collected during the scientific expeditions carried out in Western Turkey between 2005-2006 by "Grigore Antipa" National Museum of Natural History (Bucharest) and NGO - "Oceanic Club" Society of Oceanographical Exploration and Protection of the Marine Environment of Constanţa. Out of 516 true bug specimens, I identified 73 species grouped in 56 genera, belonging to 4 infraorders and 12 families. Tarisa flavescens is new record for Turkey.

The precarious temperature regime, associated with the negative influence of other environmental and biotic factors, represents a major risk for the survival of the thermal rudd from the lake Ochiul Mare, located in the Pârâul Peţea natural reserve. Therefore, a complex morphometric and body geometry analysis was conducted on specimens collected in 2013 in order to define the variability of the present population. The relatively small sample size is due to legislative restrictions on collecting endangered species, so statistical methods of analysis were applied to increase confidence in the assertions.

There is extensive agreement between energy resources and strategy analysts in Romania and the accelerating energy demand is the principal contributing factor to anthropic air pollution emissions. Energy is indispensable to entire economic sectors, despite that, the expanding consideration given to changes in the global climate and sustainable economic growth has reiterated the scientific interest in the connection between pollution and economic development, especially in the current period when energy independence is extremely important. This paper analyzes the long - term and the connection between air pollution emissions, primary energy resources, final energy consumption in industry and the economic value of the production of environmental goods and services over the period 2008 – 2023. The data sets used in this article are based on statistical research by the National Institute of Statistics, in compliance with the provisions imposed by Community legislation. From the total analysis of energy sources, a decrease can be observed from 48,166 thousand tons of oil equivalent in 2008 to 40,578 thousand tons of oil equivalent in 2023, which required a series of investments in alternative sources to compensate for this decrease. The production and supply of electricity and heat, gas, hot water and air conditioning generated approximately 42,772 thousand tons (Gg) CO 2 in 2008 compared to 17,865.65 thousand tons (Gg) CO 2 in 2023 and also during this period PM 10 varied from 15,241.94 Tons (Mg) to 22,091.25 Tons (Mg). At the national level, the degree of energy independence for energy products as a whole was around 72.2%.