Ecological diagnosis of Bega River water quality depending on the topography of Timisoara city

Human impact in various forms changes the water quality parameters and disturb the environmental living of saprobionte organisms. The present study follows the ecological parameters of the saprobionte organism as a diagnostic method of Bega river water quality in the area of Timisoara city. In August 2014 in the Bega River were collected 20 quantitative samples of benthic zones, in order to highlight the links between pollution degree and the saprobionte organisms community. Samples were collected from the upstream, middle and downstream of Timisoara city. After the identification of  saprobionte organisms,  have been performed the density, abundance and frequency of the sample. Based on these values, we can say that the upstream segment waters falls into the category of superior quality compared to the waters of the central segment, especially in the downstream segment

Research Regarding the Changes that Occur in the Structure of Benthic Macro Invertebrates Communities as a Result of Anthropogenic Activities

An important role in the monitoring of the water quality is represented by the benthic macro invertebrates. They are a key component in the transfer of matter and energy in the aquatic ecosystems. In May 2015, 20 quantitative samples of benthic sample were collected at different seasons in the Bega River water. Samples were collected from the upstream, middle and downstream of Timisoara city. The aim of this paper is to identify the changes that occur in the structure of benthic macro invertebrates’ communities due to anthropogenic activities. Once the identification of saprobionte organisms has done, it have been performed the density, abundance and frequency of the sample. Based on these values, we can say that the upstream segment waters falls into the category of superior quality compared to the waters of the central segment, especially in the downstream segment

Research Regarding the Use of Benctonic Macro Invertebrates on Bega River Water Quality Determination in the Timisoara Area

The benthic macro invertebrates are considered in this century to be one of the most important biological parameters for the quality of surface waters and they have the following characteristics: they live in constant contact with the sediments where pollutants are accumulated, have a fairly long-lasting lifecycle, are present in all types of aquatic ecosystems, are easily collected and quite easy to identify. The aim of this paper is to show the use of benthic macro invertebrates on Bega River water quality determination in the Timisoara area. After the identification of macro invertebrates has done, it have been performed the density, abundance and frequency of the sample. Based on these values, we can say that the upstream segment waters falls into the category of superior quality compared to the waters of the central segment, especially in the downstream segment

The multifaceted effects induced by floods on the macroinvertebrate communities inhabiting a sinking cave stream

First-order sinking cave streams experience considerable hydrological variability, including spates and periods of base-flow during dry seasons. Early-summer flooding on a first-order stream sinking in Ciur-Ponor Cave (Romania) represented a suitable opportunity to test the response of the macroinvertebrate community and of basal food resources quantity and diversity to such a disturbance event. The invertebrate community and basal resources (i.e., woody debris, leaves, fine particulate organic matter and epilithon) were collected from three sampling sites, before and after the flood. The sampling strategy followed an up-downstream gradient of both species diversity and quantity of allochtonous organic matter decrease as the stream flows through the cave. From each sampling site, ten replicates of both the benthic community and basal resources (detritus and epilithon) were taken. Outside the cave, the spate reduced the invertebrate community density, instant secondary production, complexity and stability (measured as eco-exergy and specific eco-exergy). The epigean section of the stream is populated mainly by taxa characteristic of karst headwaters prone to floods that usually recolonize the streambed rapidly from adjacent habitats. This effect was corroborated with a subsequent increase of both the mass of fine particulate organic matter and of invertebrate density within the cave, following the aftermath of the flood. In the river stretch situated close to the entrance (100 m), where the flood carried both live and dead organic matter, the stability index showed that the complexity of the community was not severely disturbed, despite the high influx of surface-dwelling taxa and temporary increase in species richness. Further downstream, in the third sampling site (400 m from entrance), all measured endpoints indicated a change in community stability, suggesting that local spates can act as rejuvenating drivers in shaping the invertebrate community structure and functioning